Field-based method for evaluating the annual maximum specific conductivity tolerated by freshwater invertebrates.

ABSTRACT: Most water quality criteria are based on laboratory toxicity tests and usually include chronic and acute magnitudes. Field-based criteria are typically based on long-term or continuous exposures, so they are chronic. Biological responses of quantified, short-term aqueous exposures are seldom documented in the field. However, acute values may be derived by estimating an upper limit using temporal variance and chronic values. This method estimates an upper limit from the variance of pollutant measurements from stream locations that attain the chronic criterion. The formula for deriving a 90th centile of a standard normal distribution is used to identify the upper limit, a criterion maximum exposure concentration (CMEC). The calculated CMEC is interpreted as a maximum exposure that 95% of org

SUBMITTER: Cormier SM 

PROVIDER: S-EPMC6913529 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature