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

Silver (Ag) standard, 1000µg/mL, in 5% HNO3, 100ml

As @ 1000 µg/mL in 5% HNO3, 100ml

Sulfate (SO4-2), 1000µg/ml in Water, 500ml