I am a food technologist. my question is ..what volume to spiked on 0.5g food to get 5pbb of aflatoxin..my stock solution is 100ppb aflatoxin (B1,B2,G1 ,G2)

I am a food technologist. my question is ..what volume to spiked on 0.5g food to get 5pbb of aflatoxin..my stock solution is 100ppb aflatoxin (B1,B2,G1 ,G2)

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