Aflatoxin Mix: 10mg/l each of Aflatoxin B1 [CAS:1162-65-8] ; Aflatoxin B2 [CAS:7220-81-7] ; Aflatoxin G1 [CAS:1165-39-5] ; Aflatoxin G2 [CAS:7241-98-7] in Acetonitrile