Pendimethalin, 100 µg/ml, Acetonitrile, 5ml

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

2-Aminonaphthalene,100 µg/mL,acetonitrile,1mL,

2,3,7-Trichloro[13C12]dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene