Abstract
The aim of this study was to compare the toxicity of five chemicals to water fleas (Daphnia magna) cultured in either hard to soft water. The toxicity tests were made in reconstituted waters and the five chemicals to be tested were, p,p'-DDT, pentachlorophenol (PCP), tetrapropylenbenzyl sulfonate (TPBS), potassium bichromate (K/sub 2/Cr/sub 2/O/sub 7/) and zincsulfate (ZnSO/sub 4/ x 7H/sub 2/O).
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