Co @ 1000 µg/mL in 5% HNO3, 100ml

Cyanide (CN-)@1000mg/L in 0.1% NaOH, 100ml

Mn, 1000 µg/mL in 5% HNO3, 100ml

Sulfide (S), 1000µg/mL in Water, 3 x 20ml