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

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

Disodium methyl arsonate hexahydrate, 500mg

Method 200.8/1638/1640 Internal Standard, 10µg/ml in 2%-HNO3, 4x25ml