Multi-Element Internal Standard

2,2',3,3',4',5,6,6'-Octachloro-4-methoxybiphenyl, 1.2ml x 50ug/ml, nonane

4,4'-Diaminobiphenyl-d8 (Rings-d8)

Imidacloprid D4, 100μg/ml in Acetone, 1ml