As @ 1000 µg/mL in 5% HNO3, 100ml

Arsenic Standard: 1000 µg/g As in 75 cSt Hydrocarbon Oil, 50g

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

Phosphate (PO4-3) as P, 1000µg/ml in Water, 100ml