Cr, 1000 µg/mL in 5% HNO3, 100ml

Nitrate (NO3-) as N, 1000µg/mL in Water, 500ml

Sn @ 10000 µg/mL in 5% HNO3, tr. HF, 100ml

Complex Cyanide (CN-), 1000µg/ml in Tr. NaOH / Water, 100ml