本国际标准描述了一种测定水蚤长期亚致死毒性的方法 magna Straus（枝角类，甲壳纲）的: a） 在试验条件下可溶或保持稳定的化学物质 试验条件下的悬浮液或分散液， b） 在倾析、过滤或离心后处理或未处理的工业或污水废水， c） 地表水或地下水。 注:本国际标准改编自OECD指南211[1]。

This International Standard describes a method for the determination of the long term sublethal toxicity to Daphnia magna Straus (Cladocera, Crustacea) of: a) chemical substances, which are soluble under the conditions of the test, or can be maintained as stable suspensions or dispersions under the conditions of the test, b) industrial or sewage effluents, treated or untreated, after decanting, filtration, or centrifugation, c) surface or ground waters. NOTE This International Standard is adapted from OECD Guideline 211[1].