4-Chlorophenol solution, 200mg AOX/l, 100ml

Disodium methyl arsonate hexahydrate, 500mg

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

Chlorine, 10000µg/g (1.00wt%) in Mineral Oil,100ml