· SOP 067 based on AOAC Official Methods, 20th edition (Kjeldahl Method & Calculation) AOAC...
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· SOP 067 based on AOAC Official Methods, 20th edition (Kjeldahl Method & Calculation) AOAC 947.05, 20th edition SOP 066 based on AOAC 981.12, 20th edition SOP 064 based on AOAC