As @ 1000 µg/mL in 5% HNO3, 100ml

Chloride (Cl-), 1000µg/mL in Water, 500ml

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

V21 Wear Metals Standard: 30µg/g in Hydrocarbon Oil, 100g