A new method for the evaluation of the oxidizing equivalent of manganese in surface freshwaters.
The suitability of application of a number of previously used methods for the evaluation of the oxidizing equivalent (OE) of manganese in natural waters is compared with a new method, which depends upon colour development of the dye N,N'-diethyl-p-phenylenediamine (DPD) upon oxidation by oxidized forms of manganese. The effect of introducing a commonly used metabolic poison, azide, into the most reliable of these determinations of OE has also been assessed.
Johnson
D
D
Department of Chemistry, University of Queensland, Qld 4072, Australia.
Chiswell
B
B