Sulfide (S), 1000µg/mL in Water, 3 x 20ml

Mo, 1000 µg/mL in 5% HNO3, tr. HF, 100ml

4-Chlorophenol solution, 200mg AOX/l, 100ml

Sulfur, 1500µg/g (0.150 wt%) in 75 cSt Mineral Oil, 100ml