Phosphate (PO4-3) as P, 1000µg/ml in Water, 500ml

Nitrite Standard: NO2-, 1000µg/mL iin Water, 100ml

Mo, 1000 µg/mL in 5% HNO3, tr. HF, 100ml

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