Cyanazine, 10 µg/ml, Ethyl acetate, 10ml

13C3-Caffeine, 100 µg/ml, Methanol, 1ml

3,3',4,5'-Tetrachloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane

2,4,5-Trichloroanisol,1000 µg/mL,isopropanol,1mL,