Standardized Product Definition and Product Testing Guidelines for ...
Standardized Product Definition and Product Testing Guidelines for ...
Standardized Product Definition and Product Testing Guidelines for ...
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4.3 Test Category C - Advanced Analysis <strong>and</strong> Soil Enhancement<br />
Properties<br />
Test Category C is optional <strong>for</strong> all biochar materials. Producers may report on none, one, some,<br />
or all of the properties contained in the Test Category C set of advanced analysis <strong>and</strong> soil<br />
enhancement properties, using the prescribed test methods. Biochar advanced analysis<br />
characteristics include the volatile matter content, porosity, <strong>and</strong> surface area of biochars.<br />
Biochar soil enhancement properties identify plant nutrients contained in the biochar.<br />
Biochars tested under Test Category C may report on any or all of the properties presented in<br />
Table 3 below:<br />
Table 3: Test Category C Characteristics <strong>and</strong> Criteria<br />
Test Category C: Biochar Advanced Analysis <strong>and</strong> Soil Enhancement Properties - Optional <strong>for</strong><br />
All Biochars<br />
Requirement Criteria Unit Test Method<br />
Mineral N<br />
(ammonium <strong>and</strong><br />
nitrate)<br />
Total Phosphorus<br />
& Potassium<br />
(P&K)*<br />
Declaration<br />
Declaration<br />
mg/kg<br />
% of total<br />
mass, dry<br />
basis<br />
Available P Declaration mg/kg<br />
Volatile Matter<br />
Total Surface<br />
Area<br />
External Surface<br />
Area<br />
Declaration<br />
% of total<br />
mass, dry<br />
basis<br />
2M KCl extraction, followed by spectrophotometry<br />
(Rayment <strong>and</strong> Higginson 1992)<br />
Modified dry ashing followed by ICP (Enders <strong>and</strong><br />
Lehmann 2012)<br />
2% <strong>for</strong>mic acid followed by spectrophotometry<br />
(modified from Rajan et al 1992, Nutrient Cycl in<br />
Agroecosystems 32:291-302 <strong>and</strong> AOAC 2005, as used<br />
by Wang et al 2011)<br />
ASTM D1762-84<br />
Declaration m2/g ASTM D 6556-10 St<strong>and</strong>ard Test Method <strong>for</strong> Carbon<br />
Black – Total <strong>and</strong> External Surface Area by Nitrogen<br />
Declaration m2/g Adsorption. See Appendix 2.<br />
* Total K is sufficiently equivalent to available K <strong>for</strong> the purpose of this characterization<br />
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5 <strong>Product</strong> Labeling <strong>and</strong> Documentation<br />
<strong>Product</strong> labeling <strong>and</strong> documentation will be an important part of any biochar certification<br />
program. In order to qualify <strong>for</strong> certification, biochar producers <strong>and</strong> manufacturers must share<br />
in<strong>for</strong>mation about the feedstock <strong>and</strong> final biochar material. Biochar test results <strong>and</strong> feedstock<br />
<strong>St<strong>and</strong>ardized</strong> <strong>Product</strong> <strong>Definition</strong> <strong>and</strong> <strong>Product</strong> <strong>Testing</strong> <strong>Guidelines</strong> <strong>for</strong> Biochar That Is Used in Soil 15
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