A MODIFIED FIELD VERSION OF THE WINKLER DETERMINATION OF DISSOLVED OXYGEN FOR TESTING REMOTE SOURCES OF WATER

Abstract

Summary A modification of a simple field method (Drew and Robertson, 1974) for the Winkler determination of dissolved oxygen is described. The modification, involving the addition of sulphuric acid and sodium azide as preserving agents rather than the precipitation of manganese hydroxides in the field, gives more accurate results when samples have to be stored before completion of the determination.