Internal Standard

2,4-Dimethyl acetic acid methyl ester, 100µg/mL, Solvent-MTBE, Unit 1mL, # of units-1, Cas.no. 55954-23-9

Iprobenfos, 100 µg/ml, Ethyl acetate, 5ml

1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin , 1.2ml x 50ug/ml, nonane