2,4'-DDE, 100 µg/ml, Ethyl acetate, 5ml

2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenyl

4-n-Octylphenol-d4monoethoxylate

Acrylamide (1,2,3-13C3, 99%),1mg/ml in MeOH, 1,2ml