Isofenphos, 100 µg/ml, Acetonitrile, 1ml

4-n-Octylphenol-d4 diethoxylate

2,2',5-Tribromobiphenyl, 1.2ml x 50ug/ml, nonane

Sulfamethoxazole-d4 (benzene-d4),100 µg/mL,MeOH,1mL