Chromium (Cr), 1µg/ml in 2%-HNO3 / Water, 100ml

Mercury (Hg), 1µg/ml in 2%-HNO3 / Water, 3 x 20ml

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

Nitrate (NO3-) as N, 1000µg/mL in Water, 500ml