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RECORD NUMBER: 198 OF 987

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Main Title

Comparison of the EC50s of Algal Toxicity Tests Calculated by Four Methods.

Author

Walsh, G. E. ; Deans, C. H. ; McLaughlin, L. L. ;

CORP Author

Environmental Research Lab., Gulf Breeze, FL.

Year Published

1987

Report Number

EPA/600/J-87/258;

Stock Number

PB88-182423

Additional Subjects

Tin ; Toxicity ; Algae ; Pesticides ; Concentration(Composition) ; Growth ; Organic compounds ; Inorganic compounds ; Graphic methods ; Population growth ; Statistical analysis ; Density(Mass/Volume) ; Interpolation ; Chemical analysis ; Reprints ;

Holdings

Library	Call Number	Additional Info	Location	Last Modified	Checkout Status
NTIS	PB88-182423	Some EPA libraries have a fiche copy filed under the call number shown.		07/26/2022

Collation

Abstract

EC50s (calculated concentrations that would inhibit growth by 50%) of 21 pesticides in unicellular algal toxicity tests were calculated by straight-line graphical interpolation, moving average interpolation, probit analysis and the binomial method. EC50s of 18 tin compounds were calculated by graphical interpolation, moving average and probit methods. A total of 187 tests was analyzed. Values of the EC50 were essentially identical when calculated by each method, and it is concluded that straight-line graphical interpolation, the simplest and most rapid method, can be used to estimate relative toxic effect on algal population growth.

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