Bulk aqueous ammonia by closed absorption

1. Scope and Applicability

This method covers a declared bulk aqueous-ammonia grade produced by combining separately supplied manufactured anhydrous ammonia and purchased high-purity deionised water in a closed absorption/blending system, concentration adjustment, indirect cooling where used, water-only vent recovery, quality acceptance, storage and loading to plant gate. hill-process-2021 supports the production and QC sequence; yara-solution corroborates gas dissolution and bulk delivery independently. No source grade, density, recipe, yield, energy use or certification becomes a universal default.

Exclude anhydrous ammonia as final product, ammonium salts, UAN/APP or formulated multi-nutrient fertilizer, cleaning formulations with additives, recovered waste-derived ammonia, high-purity electronic purification trains, packaged consumer products, distribution and use. Direct ammonia synthesis belongs to the separately linked upstream ammonia dataset. This boundary requires purchased indirect cooling where cooling is imported, offsite wastewater treatment, and no foreground combustion; on-site cooling utility manufacture, direct water discharge, acid scrubbing, nitrogen blanketing, refrigerant losses or any additional chemical need a documented atomic-flow extension when present. A use label alone never creates another PCR.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.other-transportable-goods-except-metal-products-machinery-and-equipment.basic-chemicals.ammonia-in-aqueous-solution
classification_refs	CPC 3.0 34652; proposed narrower production-route scope; acceptance pending
covered_products	Bulk aqueous NH3 solution, no added solute, declared measured concentration
excluded_products	Anhydrous ammonia and incompatible routes/formulations listed in section 1
representative_product	Actual accepted SKU; no default concentration
production_route	Closed absorption of manufactured anhydrous ammonia in purchased DI water
market_state	Bulk aqueous liquid at plant gate, net solution mass

3. Reference Flow

Field	Value
What	Supply the declared aqueous ammonia solution
How much	1 kg accepted net as-supplied whole solution
How well	Actual NH3 assay, water, impurities and acceptance specification; temperature and density recorded
How long or cycle	One matched site, grade, route and stock-accounting period through actual plant-gate handover
reference_flow_link	aq_product

Field	Value
Reference amount	1
Reference product flow	Aqueous ammonia 058124f8-5e84-4070-b6c0-4bacac3a0024
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	Site and period; grade and measured NH3 mass fraction; water and impurities; net solution basis; acceptance Q; density temperature method; feed route and provider; stock/rework burdens; cooling service reference; electricity region voltage and delivery mix; emissions media and wet/dry gas basis; waste receiver; allocation; plant-gate condition

Required qualifiers must be declared in dataset metadata, process notes or reference-flow description. Missing qualifiers make the package incomplete. NH3-active mass and nitrogen mass are companion subledgers, not alternate reference outputs.

4. Measurement and Unit Rules

Q means accepted net supplied solution kg at actual plant-gate handover; retained closing finished stock is not Q. Returned parcels supplied again must not create duplicate cumulative accepted output; trace original lot returns, rework and handover. The physical balance retains all opening/closing feed, WIP and finished stocks and uses actual net plant-gate supply as reference output; a separate production tally is a reconciliation record, not an additional output to add to the same closing finished stock. Release opening-stock burdens or transfer burdens into closing stocks by lot and measured assignment; stock is neither a free purchase nor an omission.

Preserve complete raw-period totals for the same site/grade/state/route production pool: startup/shutdown, failed and zero-output runs, downtime, returns, rework, opening/closing WIP and stock with their carried burdens. Reconcile final acceptance, dispatch and stocks; count each accepted parcel once, excluding packaging and internal recirculation. Match burdens released from opening stocks and retained in closing stocks without deleting failed-run burdens or averaging successful-batch intensities. Divide the matched attributable pool totals by positive Q once after physical conversions. If the entire pool Q is zero, retain raw totals and stock/destination records; no normalized result exists. Separate incompatible pools by evidence, never solely to obtain a positive denominator.

rule_id	applies_to	required_property	required_unit	rule
measure_reference	aq_product	Mass	kg	Use 1 kg net accepted supplied whole solution; report Q in kg. Do not divide again by NH3 fraction.
measure_materials	nh3_feed, di_water, ammoniacal_liquor	Mass	kg	Whole purchased streams cross the boundary once. NH3, water and impurities are component subledgers, never duplicate purchases. Convert liquid volume using independently measured density at matching temperature and composition.
measure_energy	electricity, cooling_service	Net calorific value for electricity; delivered cooling duty for cooling	MJ	Electricity kWh × 3.6 = MJ. Cooling is integrated coolant mass × measured enthalpy difference; verify service basis independently of the database property label.
measure_emissions	nh3_air, water_air	Mass	kg	Use matching concentration × integrated gas volume, without extra duration; integrate flow rate over time only for rate records. Retain T/P and wet/dry basis and NH3 versus N convention.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Received manufactured anhydrous ammonia, purchased DI water, electricity and imported indirect cooling with traceable upstream supply
starting_condition_role	Foreground conversion gate; cradle-to-gate result requires linked upstream supply and waste treatment
product_classification_scope	CPC 34652 route subset, not all possible recovered or formulated ammonia solutions
recursive_input_rule	Returned internal solution is a loop, not new upstream ammonia; purchased finished aqueous solution dilution is outside this route
upstream_dataset_requirement	Match ammonia synthesis route and purity, DI production and delivery, actual grid supply and cooling service; link waste destination without double counting
disclosure	Actual process configuration, grade, sources, stock burdens, omissions, medium, geography and utility provider conventions

rule_id	applies_to	rule	source_ids
boundary_complete	aq_absorption	Include receiving, actual vaporisation, absorption, concentration adjustment, indirect cooling, vent recovery, cleaning, failed runs, storage and plant-gate loading. Keep stage meters within one foreground process.	hill-process-2021; hill-handling-2021
boundary_losses	aq_absorption	Close captured/recovered/disposed NH3 separately from atmospheric NH3; offsite wastewater treatment is a linked downstream activity, not a foreground air or water emission. Actual direct environmental discharge requires added receiving-medium species rows.	hill-handling-2021; lvic-balance-2007
boundary_extensions	aq_absorption	Do not silently omit any actual utility, chemical, packaging, direct emission or waste outside the stated route. Extend with verified atomic rows and original method evidence or declare the case inapplicable.	lvic-balance-2007

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
aq_absorption	Closed absorption, acceptance and bulk dispatch	required	Declared route and actual conditional utilities	One integrated foreground unit; independent stage records and internal loops	per 1 kg reference flow

Process: Closed absorption and bulk dispatch (aq_absorption)

Inputs

Product flows

Ammonia, anhydrous (nh3_feed)

Measure the entire received manufactured anhydrous-ammonia stream, including its actual impurities. Production mix at plant; no native geography or CAS is declared. Retain supplier NH3 assay, water, physical state, temperature/pressure and upstream synthesis route; do not assume the record fixes any purity or burden.

• Selected flow: Ammonia, anhydrous a0e3299b-9484-4ec3-89d3-cd1e2d6c2225
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; unit group 93a60a57-a4c8-11da-a746-0800200c9a66 / kg
• Amount rule: Complete attributable period feed kg, converted from actual custody-transfer mass or compatible volume/density; normalize the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_materials
• Sources: hill-process-2021

Deionised water (di_water)

Purchased deionised water, production mix at plant, ion exchange or reverse osmosis, CAS 7732-18-5; geography unspecified. Include absorption/dilution water and actual water for cleaning or water-only vent scrubbing. Supplier production and delivery remain upstream; no direct abstraction is implied.

• Selected flow: Deionised water 5b3acbab-2518-4406-8736-d21f222d757a
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; unit group 93a60a57-a4c8-11da-a746-0800200c9a66 / kg
• Amount rule: Complete purchased/consumed period kg reconciled to stocks; distinguish incorporation, scrubbing and cleaning submeter totals without duplicating purchases; divide the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_materials
• Sources: hill-process-2021

Alternating current (electricity)

Native identity is CN, <1 kV, consumption mix to user, grid-average supply. Apply this UUID only to that supply. Meter ammonia receiving/vaporisation when used, absorption pumps, controls, storage and loading. Imported cooling service energy is excluded from this meter after documented separation; another region/voltage needs a separately verified identity and provider.

• Selected flow: Alternating current 50657322-939c-4829-a87b-47c093bfa6a7
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200c9a66; unit group 93a60a57-a3c8-11da-a746-0800200c9a66 / MJ
• Amount rule: Complete attributable meter kWh multiplied by 3.6 to MJ; preserve every meter and utility allocation before divide the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_electricity
• Sources: lvic-balance-2007

Indirect process cooling service (cooling_service)

Conditional purchased indirect cooling duty at the process heat exchanger. Keep supply/return temperatures, pressure, coolant composition and integrated flow. A database NCV/MJ label does not establish delivered cooling duty; require the supplier service reference and matching enthalpy basis. No brewery energy range or coefficient of performance is a default. A facility without this service documents absence; on-site utility production requires a complete separately evidenced extension.

• Selected flow: Indirect process cooling service
• Flow property / unit: Delivered cooling duty / MJ; property and unit-group UUID unresolved
• Amount rule: Measured net delivered period cooling MJ from the supplier-compatible enthalpy difference times integrated coolant mass; retain heat losses and boundary; divide the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_cooling
• Sources: lvic-balance-2007

Outputs

Product flows

Aqueous ammonia (aq_product)

The only reference product output is accepted aqueous NH3 solution in bulk at plant gate, not pure NH3 or isolated NH4OH. Native CAS 1336-21-6, production mix at plant, no fixed concentration, treatment route or geography. State actual grade and NH3 mass fraction; product identity does not provide a supplier background dataset.

• Selected flow: Aqueous ammonia 058124f8-5e84-4070-b6c0-4bacac3a0024
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; unit group 93a60a57-a4c8-11da-a746-0800200c9a66 / kg
• Amount rule: 1 kg
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_product
• Sources: hill-process-2021

Waste flows

Ammonia-containing aqueous cleaning liquor (ammoniacal_liquor)

One aqueous waste stream combines compatible captured spill, water-scrubber purge and cleaning liquor only where actually collected in the same receiver. Keep incompatible streams as separate added atomic exchanges. Record whole wet kg, NH3-equivalent/total N and water separately, receiver and treatment; neither an ammonia-nitrogen index nor unrelated industrial wash water is its identity. Internal recovered solution never crosses this boundary twice.

• Selected flow: Ammonia-containing aqueous cleaning liquor
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; unit group 93a60a57-a4c8-11da-a746-0800200c9a66 / kg
• Amount rule: Complete exported wet waste kg and independently assayed component kg, including failures and spills; no offsite-treatment emissions booked at this foreground outlet; divide the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_waste
• Sources: hill-handling-2021

Elementary flows

ammonia (nh3_air)

CAS 7664-41-7, emissions to air, unspecified subcompartment, as kg NH3. Include actual stack, fugitive, tank breathing, relief, loading and maintenance losses after control. Document the receiving-air location; a known finer compartment needs the corresponding verified flow. Air is external ambient air, not indoor exposure. No correction flow, default positive emission or regulatory reporting percentage is used.

• Selected flow: ammonia 08a91e70-3ddc-11dd-a2a9-0050c2490048
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; unit group 93a60a57-a4c8-11da-a746-0800200c9a66 / kg
• Amount rule: Independent measured/modelled NH3 period kg using calibrated concentration and matching integrated gas volume; rate is integrated over duration only when it is a rate. Never derive both NH3 and water loss from one residual; divide the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_emissions
• Sources: hill-handling-2021

water vapour (water_air)

CAS 7732-18-5, emissions to air unspecified, water vapour only. Measure net process water added to outgoing gas above incoming moisture on compatible wet/dry and temperature/pressure bases; liquid entrainment is a different exchange. No freshwater discharge or water withdrawal is represented by this flow.

• Selected flow: water vapour fe0acd60-3ddc-11dd-ac04-0050c2490048
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; unit group 93a60a57-a4c8-11da-a746-0800200c9a66 / kg
• Amount rule: Independent humidity/condensate and integrated gas records give net period emitted kg; phase change does not create reaction water; divide the matched raw period total by Q once.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_emissions
• Sources: lvic-balance-2007

7. Allocation and Co-product Handling

rule_id	applies_to	rule	source_ids
allocation_physical	aq_absorption	Preserve whole physical input/output and internal-loop masses before allocating environmental burdens. Recovered internal NH3/water is not a co-product or avoided purchase credit. Wet waste keeps whole physical mass.	lvic-balance-2007
allocation_shared	aq_absorption	Prefer dedicated submetering and physical assignment. Where utilities are shared, document measured causal drivers and shares summing to one; retain unallocated totals and assign failed-run/stock burdens to the matched pool. No mass multiplier is applied to physical co-product output.	lvic-balance-2007

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_product	aq_absorption	aq_product	lot and stock ledger	lot IDs; accepted net kg; NH3 fraction; water; impurities; temperature; density; acceptance; dispatch; returns; opening/closing stock and WIP; carried burdens	Calibrated scales/tank meters, temperature-matched density, retained-sample assay, supplier CoA/site QC and unique lot acceptance ledger; Raw aggregation rule: Reconcile Q and each burden movement; a parcel is accepted once after rework, not once per pass	kg; kg/kg; deg C	each batch and stock close	Complete declared period including failures and zero-output runs	Same site grade state route pool and actual utility/waste boundaries	per 1 kg reference flow	Calibration, timestamps, chain of custody, original logs, inventory reconciliation and uncertainty
cp_materials	aq_absorption	nh3_feed; di_water	custody transfer and consumption	delivery mass; volume; density; T/P; NH3 assay; water and impurity fractions; source route; provider; opening/closing feed stocks; stage water meters	Calibrated transfer masses, compatible density/temperature and supplier assays; separate actual ingredient and cleaning-water meters; Raw aggregation rule: Reconcile complete external consumption and stocks, retain component subledgers without extra exchanges	kg; m3; kg/m3; deg C; kPa; kg/kg	each delivery and batch	Complete declared period including failures and zero-output runs	Same site grade state route pool and actual utility/waste boundaries	per 1 kg reference flow	Calibration, timestamps, chain of custody, original logs, inventory reconciliation and uncertainty
cp_electricity	aq_absorption	electricity	meter and utility assignment	meter start/end; kWh; voltage; grid region; delivered mix; utility boundaries; submeter shares; failed-run and standby usage	Calibratable submeters and bills; separate service-embedded energy from this unit electricity; Raw aggregation rule: Sum complete period meter differences before 3.6 conversion and pool assignment	kWh; MJ	continuous totals and period close	Complete declared period including failures and zero-output runs	Same site grade state route pool and actual utility/waste boundaries	per 1 kg reference flow	Calibration, timestamps, chain of custody, original logs, inventory reconciliation and uncertainty
cp_cooling	aq_absorption	cooling_service	service receipt and enthalpy measurements	provider; service reference; integrated coolant mass; flow rates and duration when used; supply/return T/P; composition; heat capacity/enthalpy method; losses; boundary	Calibrated heat meter and supply/return enthalpy with supplier service definition; NCV label is insufficient; Raw aggregation rule: Integrate rates only; sum net delivered duty, not both service and its embedded resources	kg; kg/s; s; deg C; kPa; kJ/kg; MJ	continuous and period close	Complete declared period including failures and zero-output runs	Same site grade state route pool and actual utility/waste boundaries	per 1 kg reference flow	Calibration, timestamps, chain of custody, original logs, inventory reconciliation and uncertainty
cp_waste	aq_absorption	ammoniacal_liquor	waste manifest and assay	wet kg; NH3 equivalent; total N; water; impurity species; sample time; compatible receiver; destination; return/recovery; stock	Weigh whole exported liquor, independently assay and retain transfer and treatment acceptance records; Raw aggregation rule: Sum exported wet kg once; internal recovery cancels; reconcile components and carried burdens	kg; kg/kg	each removal and stock close	Complete declared period including failures and zero-output runs	Same site grade state route pool and actual utility/waste boundaries	per 1 kg reference flow	Calibration, timestamps, chain of custody, original logs, inventory reconciliation and uncertainty
cp_emissions	aq_absorption	nh3_air; water_air	source test and event log	outlet; NH3 concentration; humidity in/out; gas flow rate/duration or integrated volume; T/P; wet/dry basis; controls; loading/relief/maintenance events; species convention; uncertainty	Calibrated source/fugitive and humidity methods covering vents, storage/loading and nonroutine events; retain nondetect handling; Raw aggregation rule: Sum nonoverlapping species/outlet/event amounts on compatible bases; no unexplained residual emission factor	kg; mg/m3; m3; m3/s; s; deg C; kPa	test campaign plus complete operating/event log	Complete declared period including failures and zero-output runs	Same site grade state route pool and actual utility/waste boundaries	per 1 kg reference flow	Calibration, timestamps, chain of custody, original logs, inventory reconciliation and uncertainty

Calculation Rules

rule_id	applies_to	formula_or_rule	inputs	output	source_ids
calc_normalize	all inventory rows	For Q > 0: x_i = B_i / Q. B_i is the matched attributable raw period total after unit conversion and opening/closing burden transfers. For Q = 0, no x_i. aq_product = 1 kg/kg.	B_i; Q	normalized exchange	lvic-balance-2007
calc_components	nh3_feed, aq_product, ammoniacal_liquor	m_NH3eq = m_whole × measured w_NH3eq. N mass uses the declared stoichiometric N/NH3 molecular-mass ratio or independently measured N. Water = whole mass × independently measured water fraction, not an unmeasured balance remainder.	m_whole; w_NH3eq; measured water fraction; molecular mass convention	component subledgers	hill-process-2021; hill-spec-2020
calc_balances	aq_absorption	For total physical mass and each element: external material input + all opening physical stocks = actual accepted net plant-gate supply + exported waste + environmental emissions + all closing physical stocks + documented residual. Q excludes retained finished stock. Electricity and indirect cooling services have separate energy ledgers; coolant circulation outside the process material boundary is not raw material input. Internal loops cancel. Retain NH3-equivalent, total N, H, O and water ledgers; investigate residuals against uncertainty without forcing closure.	all external mass; opening stock; closing stock; assays; emission records	physical balance residuals	lvic-balance-2007
calc_water_species	aq_absorption	Aqueous acid-base speciation is not procurement of pure NH4OH or proof of net reaction-water production. Track actual dissolved NH3/NH4+ convention, evaporation/condensation and water phase separately. Do not invent reaction water, dry-organic generation or COD-derived water. Any additional reaction needs an independently measured/reaction-supported extent and balanced species ledger.	species convention; assays; phase measurements; reaction evidence if applicable	independent water and species ledgers	lvic-balance-2007; yara-solution
calc_gas	nh3_air, water_air	m = concentration × integrated compatible gas volume with stated unit conversion; if only gas rate exists, V = integral(rate dt). Water uses net outgoing minus incoming humidity. Never multiply integrated volume by time again or double-count measured and modelled outlets.	concentration; integrated volume; gas rate if used; duration if used; humidity; T/P; wet/dry basis	raw species kg	lvic-balance-2007
calc_cooling	cooling_service	H_MJ = sum[m_coolant × (h_return - h_supply)] / 1000 for h in kJ/kg, net of boundary-consistent corrections. This duty is distinct from electricity input and an NCV label. No unmeasured COP converts it to electricity.	integrated coolant mass; supply enthalpy; return enthalpy; boundary corrections	raw delivered cooling MJ	lvic-balance-2007

Data Quality Requirements

requirement_id	applies_to	requirement	evidence
quality_identity	all inventory rows	Verify complete native identity, CAS when declared, all name components, medium, route, grade, geography and exact property/unit basis. A valid UUID does not establish background dataset compatibility.	Direct native records; provider declarations
quality_pool	all inventory rows	Complete matched period and stock/burden trail, retained failures, duplicate-free Q and unit conversions before one normalization are mandatory.	Original pool and stock reconciliation
quality_ranges	all inventory rows	No generic recipe, yield, energy, density or emission ranges are established. Collect site values and uncertainty; unresolved empirical range needs remain explicit, not fabricated priors.	Source scope and actual collection records
quality_completeness	aq_absorption	Verify the no-additive bulk route and conditional utility/emission/waste applicability, including nonroutine events. Ordinary auxiliary identity gaps require an explicit provider/flow resolution before the corresponding dataset link is complete.	Flow diagram; test reports; utility and receiver evidence

9. Validation Rules

rule_id	applies_to	rule	source_ids
validate_reference	aq_product	Require exactly one reference product output linked to aq_product, 1 kg whole accepted solution, measured grade/concentration and positive unique Q for normalization. Active NH3 and N remain analyses.	lvic-balance-2007
validate_pool	all inventory rows	Check complete failed/zero-output/rework/WIP coverage, opening/closing burden transfers and once-only normalization; no Q = 0 per-kg result.	lvic-balance-2007
validate_balances	aq_absorption	Check independently supported whole mass, N/H/O, component and phase-water ledgers before allocation. Investigate uncertainty/residuals; no unknown outlet and reaction water fitted together.	lvic-balance-2007
validate_identity	all inventory rows	Recheck each exact native identity/property/unit and regional, grade, route, mix and receiving-medium limitation. Unresolved auxiliary links are explicit incompleteness, not silently matched substitutes.	lvic-balance-2007
validate_no_duplicates	aq_absorption	Check internal recovery cancellation, whole solution versus components, imported service versus embedded resources, and waste transfer versus treatment emissions. Do not duplicate any physical or burden exchange.	lvic-balance-2007

10. Published Dataset Profile

Field	Value
dataset_role	secondary_dataset; background_dataset
downstream_use	Declared aqueous ammonia supply to chemical or NOx-control users at matching concentration and delivery basis
allowed_use	Only the declared route/grade/site/period with complete linked upstream and waste scope
excluded_use	Pure ammonia mass, nutrient-only fertilizer service, consumer cleaning blend, recovered ammonia, downstream NOx abatement credit or generic route average
required_metadata	All reference qualifiers, native flow restrictions, provider compatibility, stock burdens, boundary and allocation
required_quality_disclosure	Coverage, raw measurements, uncertainty, missing auxiliary UUIDs/providers, unresolved range needs and residuals
update_trigger	Changed concentration, route, supply region/voltage, provider, cooling, emission control or waste destination

11. Data Sources

source_id	type	reference	used_for
unsd-cpc3-2025	official_guidance	UNSD CPC 3.0 structure, 30 June 2025, row 34652; https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv	Classification label only; no process, recipe or acceptance decision
hill-process-2021	handbook	Hill Brothers, Ammonium Hydroxide Manufacturing Process, Rev.12/2021, p.1; https://www.hillbrothers.com/wp-content/uploads/2021/12/AmmoniumHydroxide-ManufacturingProcess-PP-12-7-2021.pdf	Closed water/anhydrous-ammonia production, concentration QC with temperature/specific gravity, and shipment CoA. Single producer example; no generic grade, recipe, yield, energy or certification requirement.
hill-spec-2020	handbook	Hill Brothers, Aqua Ammonia Industrial Grade Product Specifications, Rev.12/2020, p.1; https://www.hillbrothers.com/wp-content/uploads/2021/01/AquaAmmonia-Industrial-Grade-PS-12-17-2020.pdf	Assay expressed as NH3 weight fraction; density depends on grade and temperature. Listed specification/density numbers are not defaults and do not demonstrate actual site compliance.
hill-handling-2021	handbook	Hill Brothers, Aqua Ammonia General Safety and Handling, Rev.4/2021, p.1; https://www.hillbrothers.com/wp-content/uploads/2021/04/AquaAmmonia-GeneralSafetyHandling-4-26-2021.pdf	Tank vapour control, contained spills and loading-area collection support the loss boundary. Handling guidance provides no quantified emissions factor or assumed abatement performance.
yara-solution	handbook	Yara Australia, Ammonia solution, accessed 2026-10-16; https://www.yara.com.au/chemical-and-environmental-solutions/nox-reduction-for-industrial-plants/reagents-for-nox-control/ammonia-solution/	Independent producer corroboration of ammonia-gas dissolution and bulk liquid delivery. Use-performance claims, concentration examples and logistics are not foreground quantity defaults.
lvic-balance-2007	official_guidance	European Commission, LVIC-AAF BREF, August 2007, section 1.4.6, printed p.19 / PDF p.47; https://bureau-industrial-transformation.jrc.ec.europa.eu/sites/default/files/2019-11/lvic_aaf.pdf	General method for nitrogen, water and utility balances. Historical integrated-chemical context; examples are not aqueous-ammonia recipes, utility benchmarks or sector-specific BAT limits. Collection and normalization formulas here are PCR accounting rules, not copied plant quantities.