Iron, 10,000ug/ml, 100ml

Silver (Ag) standard, 1000µg/mL, in 5% HNO3, 100ml

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

S @ 10000 µg/g (1.00 wt%) in #2 Diesel Fuel, 100ml