Cr, 1000 µg/mL in 5% HNO3, 100ml

Sn, 1000 µg/mL in 5% HNO3, 100ml

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

Nitrite (NO2-) as N, 1000µg/ml in Water, 100ml