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1 2 Table 1: Test Category A Characteristics and Criteria Test Category A: Basic Biochar Utility Properties - Required for All Biochars Requirement Criteria 1 Unit Test Method Moisture Declaration % of total mass, dry basis ASTM D1762-84 (specify measurement date with respect to time from production) Organic Carbon H:C org Total Ash Total Nitrogen Class 1: ≥60% Class 2: ≥30% and
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 4.2 Test Category B - Toxicant Reporting In addition to Test Category A thresholds and declarations, all biochar materials must meet the soil toxicity assessment thresholds as outlined in Table 2 below. Toxicants may be divided into two categories – those that may be present in the feedstocks used (metals and polychlorinated biphenyls) and those that may be produced by the thermochemical process used to make biochar (polycyclic aromatic hydrocarbons, and dioxins). Biochar made from processed feedstocks may carry additional risks from the potential presence of toxicants in the feedstock and must meet the toxicant assessment testing frequency requirements of Section 6. Biochar toxicity assessment reporting follows commonly identified soil toxicity and chemical content reporting requirements for soil amendments, composts and fertilizers. The threshold values in Table 2 are given as a range of values based on standards for soil amendments or fertilizers from a number of countries. 2 The Maximum Allowed Thresholds (MAT) indicate toxicant levels above which the material would not be considered acceptable. In order to meet the requirements of these Biochar Guidelines, reported toxicant levels must be below the MAT that has been established in the area of jurisdiction where biochar is produced and/or intended for use. If the area of jurisdiction where the biochar will be used has no threshold at all for a particular toxicant, the biochar must be below the highest maximum value established below for each specific toxicant. See Appendix 3, Toxicant Assessment and Determination of Thresholds, for more information. Table 2: Test Category B Characteristics and Criteria Test Category B: Biochar Toxicant Reporting - Required for All Feedstocks Requirement Earthworm Avoidance Test Germination Inhibition Assay Polycyclic Aromatic Hydrocarbons (PAH) Range of Maximum Allowed Thresholds 6 – 20 Dioxin/Furan (PCCD/F) 9 Pass/Fail Pass/Fail mg /kg TM ng/kg I- TEQ Test Method ISO 17512-1:2008 methodology and OECD methodology (1984a) as described by Van Zwieten et al. (2010), see Appendix 3 OECD methodology (1984b) 3 test species, as described by Van Zwieten et al. (2010), see Appendix 3 Method following US Environmental Protection Agency (1996) Method following US Environmental Protection Agency (2007) 2 The following jurisdictions were used to construct the range of values: Australia, Canada, EU, UK, USA. These entities were chosen as standards because they all have a long history of regulations addressing these toxicants in soils and other substrates. Standardized Product Definition and Product Testing Guidelines for Biochar That Is Used in Soil 13
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Page 9 and 10: 1 2 3 4 5 2 Terms and Definitions A
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