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

Germanium (Ge), 100 µg/mL in 2%-HNO3 / Water, 4x25ml

Zinc, 1000ug/ml, 100ml

Cu @ 1000 µg/mL in 5% HNO3, 100ml