The Certify API allows you to add measurement samples to your project.
Measurement samples are used to represent a set of physical measurements that you have taken of the carbon removal process.
For instance, these could be chemical analysis of soil, flue gas analyses or feedstock analyses.
Datapoints and measurement samples are closely related but measurement samples can contain many different values, whereas datapoints only contain one.
Whereas datapoints are only used in crediting calculations, measurement samples can be used in both crediting and in the data quality assessment.
A measurement sample can have multiple pieces of metadata associated with it, such as the date and time of the measurement, the location of the measurement and the measurement type .
The measurement type tells us what physical substance is being measured, such as soil, flue gas or feedstock.
Measurement types are specific to pathways, so you should look for measurement types that are specific to the pathway you are working with.
We currently support two pathways - enhanced weathering and biochar.
Each individual measurement in a sample has a property which describes the physical parameter being measured.
Measurement properties
A measurement property is made up of two parts - a quantity kind and a qualifier.
Each measurement type has an allowed list of measurement properties which are shown below.
Quantity kind
The quantity kind describes what physical parameter is being measured.
For example, mass fraction or temperature is a quantity kind.
The QuantityKind enum in the API schema lists all the possible quantity kinds.
Quantity kind is based around ideas from the QUDT project .
Qualifiers
Some properties need more information to fully describe the measurement than just the quantity kind.
In this case, we can add an extra qualifier to the property which tell us more about the measurement.
For instance, for a mass fraction quantity kind, we might add a qualifier to say that the measurement is a mass fraction of a specific element.
Measurement type reference
Enhanced weathering measurement types
Soil
Soil measurement properties
Property Quantity kind Qualifier Minimum depth DEPTH MIN_LIMIT Maximum depth DEPTH MAX_LIMIT pH ACIDITY — Buffer pH BUFFER_PH — Bulk density BULK_DENSITY — Ca²⁺ Base Saturation DIMENSIONLESS_RATIO BASE_SATURATION_CA_2PLUS K⁺ Base Saturation DIMENSIONLESS_RATIO BASE_SATURATION_K_PLUS Mg²⁺ Base Saturation DIMENSIONLESS_RATIO BASE_SATURATION_MG_2PLUS Na⁺ Base Saturation DIMENSIONLESS_RATIO BASE_SATURATION_NA_PLUS Base Saturation DIMENSIONLESS_RATIO BASE_SATURATION_MAJOR_CATIONS Al mass fraction MASS_FRACTION ELEMENT_AL As mass fraction MASS_FRACTION ELEMENT_AS Ba mass fraction MASS_FRACTION ELEMENT_BA Ca mass fraction MASS_FRACTION ELEMENT_CA Cd mass fraction MASS_FRACTION ELEMENT_CD Ce mass fraction MASS_FRACTION ELEMENT_CE Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cs mass fraction MASS_FRACTION ELEMENT_CS Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hf mass fraction MASS_FRACTION ELEMENT_HF Hg mass fraction MASS_FRACTION ELEMENT_HG K mass fraction MASS_FRACTION ELEMENT_K La mass fraction MASS_FRACTION ELEMENT_LA Lu mass fraction MASS_FRACTION ELEMENT_LU Mg mass fraction MASS_FRACTION ELEMENT_MG Mn mass fraction MASS_FRACTION ELEMENT_MN Na mass fraction MASS_FRACTION ELEMENT_NA Nb mass fraction MASS_FRACTION ELEMENT_NB Nd mass fraction MASS_FRACTION ELEMENT_ND Ni mass fraction MASS_FRACTION ELEMENT_NI P mass fraction MASS_FRACTION ELEMENT_P Pb mass fraction MASS_FRACTION ELEMENT_PB Rb mass fraction MASS_FRACTION ELEMENT_RB S mass fraction MASS_FRACTION ELEMENT_S Sc mass fraction MASS_FRACTION ELEMENT_SC Se mass fraction MASS_FRACTION ELEMENT_SE Sn mass fraction MASS_FRACTION ELEMENT_SN Ta mass fraction MASS_FRACTION ELEMENT_TA Tb mass fraction MASS_FRACTION ELEMENT_TB Th mass fraction MASS_FRACTION ELEMENT_TH Ti mass fraction MASS_FRACTION ELEMENT_TI Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V W mass fraction MASS_FRACTION ELEMENT_W Y mass fraction MASS_FRACTION ELEMENT_Y Yb mass fraction MASS_FRACTION ELEMENT_YB Zn mass fraction MASS_FRACTION ELEMENT_ZN Zr mass fraction MASS_FRACTION ELEMENT_ZR Soil Inorganic Carbon mass fraction MASS_FRACTION SOIL_INORGANIC_CARBON Soil Organic Carbon mass fraction MASS_FRACTION SOIL_ORGANIC_CARBON Soil Organic Matter mass fraction MASS_FRACTION SOIL_ORGANIC_MATTER Total Carbon mass fraction MASS_FRACTION TOTAL_CARBON Loss on Ignition mass fraction MASS_FRACTION LOSS_ON_IGNITION Cation Exchange Capacity AMOUNT_OF_SUBSTANCE_PER_MASS CATION_EXCHANGE_CAPACITY Clay mass fraction MASS_FRACTION CLAY Sand mass fraction MASS_FRACTION SAND Silt mass fraction MASS_FRACTION SILT
Porewater
Porewater measurement properties
Property Quantity kind Qualifier Depth DEPTH — pH ACIDITY — Temperature TEMPERATURE — Cl⁻ mass fraction MASS_FRACTION ANION_CL_1MINUS NO₃⁻ mass fraction MASS_FRACTION ANION_NO3_1MINUS PO₄³⁻ mass fraction MASS_FRACTION ANION_PO4_3MINUS SO₄²⁻ mass fraction MASS_FRACTION ANION_SO4_2MINUS CO₂ partial pressure PARTIAL_PRESSURE COMPOUND_CO2 Al mass fraction MASS_FRACTION ELEMENT_AL As mass fraction MASS_FRACTION ELEMENT_AS Ba mass fraction MASS_FRACTION ELEMENT_BA Ca mass fraction MASS_FRACTION ELEMENT_CA Cd mass fraction MASS_FRACTION ELEMENT_CD Ce mass fraction MASS_FRACTION ELEMENT_CE Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cs mass fraction MASS_FRACTION ELEMENT_CS Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hf mass fraction MASS_FRACTION ELEMENT_HF Hg mass fraction MASS_FRACTION ELEMENT_HG K mass fraction MASS_FRACTION ELEMENT_K La mass fraction MASS_FRACTION ELEMENT_LA Lu mass fraction MASS_FRACTION ELEMENT_LU Mg mass fraction MASS_FRACTION ELEMENT_MG Mn mass fraction MASS_FRACTION ELEMENT_MN Na mass fraction MASS_FRACTION ELEMENT_NA Nb mass fraction MASS_FRACTION ELEMENT_NB Nd mass fraction MASS_FRACTION ELEMENT_ND Ni mass fraction MASS_FRACTION ELEMENT_NI Pb mass fraction MASS_FRACTION ELEMENT_PB Rb mass fraction MASS_FRACTION ELEMENT_RB S mass fraction MASS_FRACTION ELEMENT_S Sc mass fraction MASS_FRACTION ELEMENT_SC Se mass fraction MASS_FRACTION ELEMENT_SE Si mass fraction MASS_FRACTION ELEMENT_SI Sn mass fraction MASS_FRACTION ELEMENT_SN Ta mass fraction MASS_FRACTION ELEMENT_TA Tb mass fraction MASS_FRACTION ELEMENT_TB Th mass fraction MASS_FRACTION ELEMENT_TH Ti mass fraction MASS_FRACTION ELEMENT_TI Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V W mass fraction MASS_FRACTION ELEMENT_W Y mass fraction MASS_FRACTION ELEMENT_Y Yb mass fraction MASS_FRACTION ELEMENT_YB Zn mass fraction MASS_FRACTION ELEMENT_ZN Zr mass fraction MASS_FRACTION ELEMENT_ZR Alkalinity AMOUNT_OF_SUBSTANCE_CONCENTRATION ALKALINITY Alkalinity AMOUNT_OF_SUBSTANCE_PER_MASS ALKALINITY Dissolved Inorganic Carbon AMOUNT_OF_SUBSTANCE_CONCENTRATION DISSOLVED_INORGANIC_CARBON Dissolved Inorganic Carbon AMOUNT_OF_SUBSTANCE_PER_MASS DISSOLVED_INORGANIC_CARBON Dissolved Inorganic Carbon MASS_CONCENTRATION DISSOLVED_INORGANIC_CARBON Dissolved Inorganic Carbon mass fraction MASS_FRACTION DISSOLVED_INORGANIC_CARBON Total Carbon AMOUNT_OF_SUBSTANCE_CONCENTRATION TOTAL_CARBON Total Carbon AMOUNT_OF_SUBSTANCE_PER_MASS TOTAL_CARBON Total Carbon MASS_CONCENTRATION TOTAL_CARBON Total Carbon mass fraction MASS_FRACTION TOTAL_CARBON Total Inorganic Carbon AMOUNT_OF_SUBSTANCE_CONCENTRATION TOTAL_INORGANIC_CARBON Total Inorganic Carbon AMOUNT_OF_SUBSTANCE_PER_MASS TOTAL_INORGANIC_CARBON Total Inorganic Carbon MASS_CONCENTRATION TOTAL_INORGANIC_CARBON Total Inorganic Carbon mass fraction MASS_FRACTION TOTAL_INORGANIC_CARBON
Mineral feedstock
Mineral feedstock measurement properties
Property Quantity kind Qualifier Bulk density BULK_DENSITY — Specific surface area SPECIFIC_SURFACE_AREA — H₂O mass fraction MASS_FRACTION COMPOUND_H2O Al mass fraction MASS_FRACTION ELEMENT_AL As mass fraction MASS_FRACTION ELEMENT_AS Ba mass fraction MASS_FRACTION ELEMENT_BA Ca mass fraction MASS_FRACTION ELEMENT_CA Cd mass fraction MASS_FRACTION ELEMENT_CD Ce mass fraction MASS_FRACTION ELEMENT_CE Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cs mass fraction MASS_FRACTION ELEMENT_CS Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hf mass fraction MASS_FRACTION ELEMENT_HF Hg mass fraction MASS_FRACTION ELEMENT_HG K mass fraction MASS_FRACTION ELEMENT_K La mass fraction MASS_FRACTION ELEMENT_LA Lu mass fraction MASS_FRACTION ELEMENT_LU Mg mass fraction MASS_FRACTION ELEMENT_MG Mn mass fraction MASS_FRACTION ELEMENT_MN Mo mass fraction MASS_FRACTION ELEMENT_MO Na mass fraction MASS_FRACTION ELEMENT_NA Nb mass fraction MASS_FRACTION ELEMENT_NB Nd mass fraction MASS_FRACTION ELEMENT_ND Ni mass fraction MASS_FRACTION ELEMENT_NI P mass fraction MASS_FRACTION ELEMENT_P Pb mass fraction MASS_FRACTION ELEMENT_PB Rb mass fraction MASS_FRACTION ELEMENT_RB S mass fraction MASS_FRACTION ELEMENT_S Sc mass fraction MASS_FRACTION ELEMENT_SC Se mass fraction MASS_FRACTION ELEMENT_SE Si mass fraction MASS_FRACTION ELEMENT_SI Sn mass fraction MASS_FRACTION ELEMENT_SN Sr mass fraction MASS_FRACTION ELEMENT_SR Ta mass fraction MASS_FRACTION ELEMENT_TA Tb mass fraction MASS_FRACTION ELEMENT_TB Th mass fraction MASS_FRACTION ELEMENT_TH Ti mass fraction MASS_FRACTION ELEMENT_TI Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V W mass fraction MASS_FRACTION ELEMENT_W Y mass fraction MASS_FRACTION ELEMENT_Y Yb mass fraction MASS_FRACTION ELEMENT_YB Zn mass fraction MASS_FRACTION ELEMENT_ZN Zr mass fraction MASS_FRACTION ELEMENT_ZR Total Carbon mass fraction MASS_FRACTION TOTAL_CARBON Albite mass fraction MASS_FRACTION MINERAL_ALBITE Andesine mass fraction MASS_FRACTION MINERAL_ANDESINE Augite mass fraction MASS_FRACTION MINERAL_AUGITE Hematite mass fraction MASS_FRACTION MINERAL_HEMATITE Montmorillonite mass fraction MASS_FRACTION MINERAL_MONTMORILLONITE Orthoclase mass fraction MASS_FRACTION MINERAL_ORTHOCLASE Quartz mass fraction MASS_FRACTION MINERAL_QUARTZ Rutile mass fraction MASS_FRACTION MINERAL_RUTILE Asbestiform minerals mass fraction MASS_FRACTION MINERAL_CATEGORY_ASBESTIFORM Asbestos mass fraction MASS_FRACTION MINERAL_CATEGORY_ASBESTOS Particle diameter p10 PARTICLE_DIAMETER PERCENTILE_10 Particle diameter p50 PARTICLE_DIAMETER PERCENTILE_50 Particle diameter p80 PARTICLE_DIAMETER PERCENTILE_80 Particle diameter p90 PARTICLE_DIAMETER PERCENTILE_90 Particle diameter p97 PARTICLE_DIAMETER PERCENTILE_97 Radiation equivalent dose rate [EC RP112] DOSE_EQUIVALENT_RATE RADIATION_NORMALIZATION_METHOD_EC_RP112_STANDARD_ROOM_MODEL Gamma activity concentration index [ACI] DIMENSIONLESS RADIATION_NORMALIZATION_METHOD_GAMMA_ACTIVITY_CONCENTRATION_IDX
Biomass
Biomass measurement properties
Property Quantity kind Qualifier Dry mass MASS MATERIAL_CONDITION_DRY Wet mass MASS MATERIAL_CONDITION_WET Al mass fraction MASS_FRACTION ELEMENT_AL As mass fraction MASS_FRACTION ELEMENT_AS B mass fraction MASS_FRACTION ELEMENT_B Ba mass fraction MASS_FRACTION ELEMENT_BA Ca mass fraction MASS_FRACTION ELEMENT_CA Cd mass fraction MASS_FRACTION ELEMENT_CD Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hg mass fraction MASS_FRACTION ELEMENT_HG K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Mn mass fraction MASS_FRACTION ELEMENT_MN Mo mass fraction MASS_FRACTION ELEMENT_MO N mass fraction MASS_FRACTION ELEMENT_N Na mass fraction MASS_FRACTION ELEMENT_NA Ni mass fraction MASS_FRACTION ELEMENT_NI P mass fraction MASS_FRACTION ELEMENT_P Pb mass fraction MASS_FRACTION ELEMENT_PB S mass fraction MASS_FRACTION ELEMENT_S Se mass fraction MASS_FRACTION ELEMENT_SE Si mass fraction MASS_FRACTION ELEMENT_SI Ti mass fraction MASS_FRACTION ELEMENT_TI Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V Zn mass fraction MASS_FRACTION ELEMENT_ZN Total Carbon mass fraction MASS_FRACTION TOTAL_CARBON
Ion exchange resin
Ion exchange resin measurement properties
Property Quantity kind Qualifier NO₃⁻ AMOUNT_OF_SUBSTANCE_PER_MASS ANION_NO3_1MINUS PO₄³⁻ AMOUNT_OF_SUBSTANCE_PER_MASS ANION_PO4_3MINUS SO₄²⁻ AMOUNT_OF_SUBSTANCE_PER_MASS ANION_SO4_2MINUS Ca mass fraction MASS_FRACTION ELEMENT_CA Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Na mass fraction MASS_FRACTION ELEMENT_NA Ni mass fraction MASS_FRACTION ELEMENT_NI
Biochar measurement types
Production batch
Production batch measurement properties
Property Quantity kind Qualifier Mass MASS — pH ACIDITY — H₂O mass fraction (dry basis) MASS_FRACTION_DRY_BASIS COMPOUND_H2O H₂O mass fraction (wet basis) MASS_FRACTION_WET_BASIS COMPOUND_H2O As mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_AS As mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_AS Cd mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CD Cd mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CD Co mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CO Co mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CO Cr mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CR Cr mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CR Cu mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CU Cu mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CU H mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_H H mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_H Hg mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_HG Hg mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_HG K mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_K K mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_K Ni mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_NI Ni mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_NI O mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_O O mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_O P mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_P P mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_P Pb mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_PB Pb mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_PB Sb mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_SB Sb mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_SB V mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_V V mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_V Zn mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_ZN Zn mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_ZN Dissolved Inorganic Carbon AMOUNT_OF_SUBSTANCE_PER_MASS DISSOLVED_INORGANIC_CARBON Fixed Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS FIXED_CARBON Fixed Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS FIXED_CARBON Total Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS TOTAL_CARBON Total Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS TOTAL_CARBON Total Inorganic Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS TOTAL_INORGANIC_CARBON Total Inorganic Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS TOTAL_INORGANIC_CARBON
Soil
Soil measurement properties
Property Quantity kind Qualifier pH ACIDITY — Bulk density BULK_DENSITY — Temperature TEMPERATURE — H₂O mass fraction (dry basis) MASS_FRACTION_DRY_BASIS COMPOUND_H2O H₂O mass fraction (wet basis) MASS_FRACTION_WET_BASIS COMPOUND_H2O Soil Organic Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS SOIL_ORGANIC_CARBON Soil Organic Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS SOIL_ORGANIC_CARBON Clay mass fraction MASS_FRACTION CLAY Sand mass fraction MASS_FRACTION SAND Silt mass fraction MASS_FRACTION SILT