Ni @ 1000 µg/mL in 5% HNO3, 100ml

Co @ 1000 µg/mL in 5% HNO3, 100ml

Cr, 1000 µg/mL in 5% HNO3, 100ml

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