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PRELIMINARY STUDIES OF THE EFFECTS OF DICHROMATE ION ON SURVIVAL AND OXYGEN CONSUMPTION OF DAPHNIA PULEX (L.) BY CAROL A. SHERR 1) and KENNETH B. ARMITAGE Department of Physiology and Cell Biology University of Kansas, Lawrence, Kansas, U.S.A. . INTRODUCTION Hexavalent chromium compounds (chromates and dichromates) are utilized in many industries, especially metal plating, anodyzing aluminium, leather tanning, and manufacture of such products as paints, dyes, explosives, ceramics, and paper (Besselievre, 1969; McKee & Wolf, 1963). In addition, the resistance of di- chromate to corrosion makes it an important addition to cooling water in many industries. Because hexavalent chromium occurs in many industrial effluents, its effects on organisms is of interest. The USPHS Drinking Water Standards of 1946 and 1962 set a mandatory limit of 0.05 mg/l for hexavalent chromium (McKee & Wolf, 1963). Although the standard is quite low compared to toxic levels for mammals and fish (Mertz, 1969), microcrustaceans are sensitive to extremely low levels of hexavalent chromium, and may not be protected by present standards. Because microcrusta- ceans form an essential link in the aquatic food chain, both as primary consumers (usually) and as prey for a wide variety of fish and other secondary consumers,
Crustaceana – Brill
Published: Jan 1, 1973
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