This International Standard describes a method for the determination of the acute toxicity to Daphnia magna Straus (C/adocera, Crustacea) of
a) chemical substances which are soluble under the conditions of the test;
b) industrial effluents, treated or untreated, after decanta-tion or filtration if necessary;
c) sewage effluents, treated or untreated, after decanta-tion or filtration if necessary;