Chromium (Cr), 1µg/ml in 2%-HNO3/Water, 4 x 25ml

Phenanthrene-9,10-13C2,100 µg/mL,n-nonane,1mL

Quizalofop-P-ethyl, 100 µg/ml, Acetonitrile, 5ml

2,6-Dimethylnaphthalene