Mix 33, 10.0 µg/ml, Acetonitrile, 10ml

2,2',3,4,5,5'-Hexachloro[13C12]diphenyl ether, 1.2ml x 50ug/ml, nonane

Formaldehyd-DNPH, 100 µg/ml, Acetonitrile, 5ml

3,6-Dichloropyridazine