Whole Effluent Toxicity Testing Methods: Accounting for Variance

The research outlined in this report quantifies the variability in toxicity tests used in whole effluent toxicity (WET) testing and ambient water testing and relates how knowledge of this variability can be used to comply with WET limits in National Pollutant Discharge Elimination System permits. Three major types of analyses were performed: (1) the relevant variance components that could be ascertained from the data were evaluated; (2) intralaboratory variance was analyzed; and (3) the results of the statistical analyses were used in a case study to examine changes in interpretation of compliance with WET limits from the use of the variance estimates. Published by WERF. 100 pages. Soft cover.

Originally funded as WERF project 95-PQL-1.