Water effect ratio

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The water effect ratio (WER) is defined as the ratio of the toxicity of a metal in site water to the toxicity of the same metal in standard laboratory water.

Water effect ratios may be used to derive site-specific limits for certain metals from national and state aquatic life criteria that were originally developed using laboratory toxicity data. The water effect ratio has been developed to compensate for site-specific biogeochemical factors such as hardness, alkalinity, organic carbon, etc. which can influence the bioavailability and toxicity of metals.

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