Various acid pretreatments of water samples containing chromium

Abstract

The loss of chromium during pretreatment of water samples was investigated. The standard samples containing known amounts of chromium were treated by the wet digestion method under various conditions according to JIS K 0102, to compare the recoveries of chromium. The digestion with perchloric acid resulted in a substantial loss of chro mium, and the digestion with hydrochloric acid, with heating to complete dryness, also resulted in loss. The addition of sulfuric acid to perchloric acid reduced the loss, but the recovery was not quantitative. Any significant loss was observed after digestion using nitric acid with hydrogen peroxide.