ISO 22095 Mass Balance Chain of Custody Audit Requirements
ISO 22095 mass balance audits demand strict site boundaries, verified baseline yield conversions, and zero negative credit balances across accounting periods.
ASTM D6866 Radiocarbon Testing
Meaning
Standard analytical methods determine the biobased carbon content of solid and liquid samples using radiocarbon analysis. Modern laboratories execute astm d6866 radiocarbon testing to measure the ratio of carbon-14 to total organic carbon in polymer resins and functional additives. The methodology quantifies the fraction of carbon derived from recently harvested biomass versus fossil feedstocks by accelerator mass spectrometry or liquid scintillation counting.
It applies to raw pellets and converted finished goods, but stops applying when evaluating total product mass because non-carbon inorganic fillers fall outside the analytical boundary.
Carbon Fractionation
Accelerator mass spectrometry isolates carbon atoms from combusted resin samples to measure isotopic ratios directly against reference materials. The resulting values define the biobased organic carbon percentage in a compound. High precision in this measurement prevents mislabeling of renewable polymer content during supply chain handoffs.
Measurement Protocol
Processing conditions and inorganic additives do not alter the intrinsic carbon isotope ratio of a polymer chain. Standardized testing protocols require sample conversion into graphite or carbon dioxide before spectrometer injection. The analytical procedure identifies petroleum contamination in bio-polyethylene or bio-polyesters regardless of prior heat history.
Dosing Limit
Biobased carbon percentages measure organic carbon composition rather than total part weight. When calcium carbonate or glass fibre reinforcement enters a compound, biobased mass content drops while the carbon isotope ratio stays constant. Technical specifications must separate organic carbon fraction claims from gross structural mass fractions to avoid compliance failures.