You are here:
DEVELOPMENTAL MALFORMATION OF FROG EMBRYOS: AN ANALYSIS OF TERATOGENICITY OF CHEMICAL MIXTURES
Citation:
Shirazi, M. AND D. Dawson. DEVELOPMENTAL MALFORMATION OF FROG EMBRYOS: AN ANALYSIS OF TERATOGENICITY OF CHEMICAL MIXTURES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-91/230 (NTIS PB92108190), 1991.
Description:
Chemical compounds known to be teratogenic to frog embryos were tested singly and in binary mixtures and Weibull functions were used to model their concentration response relationships. eparate Weibull function with an additive concentration variable modeled the mixtures using only single chemical test data. even chemicals in five binary mixtures at 3/1, 1/1, and 13 mixture proportions each were tested. he ratios of measured and calculated model parameters and median concentrations were estimated for comparing the results. he ratios ranged from 0.72 and 1.44 with an average at 0.99, an agreement that was qualitatively similar to modeling mixtures of narcotic chemicals which are known to produce additive concentration effects. he model reliability in determining mixture response classes and prediction of effects based on single chemical data was quantified. he model is useful for environmental risk assessment of chemical mixtures in hazardous waste sites and for the design of mixture experiments.