Ethanol standard in serum,0.2g/L,serum, 1.5mL

Diisopropylnaphthalene (mixture of isomers), certified, 0.1g

Chlortoluron-d6 (N,N-dimethyl-d6), 100µg/ml in MeOH, 1ml

2,2',3,4',5,6,6'-Heptachlorobiphenyl (188)