A. Svenson et Ll. Zhang, ACUTE AQUATIC TOXICITY OF PROTOLYZING SUBSTANCES STUDIED AS THE MICROTOX EFFECT, Ecotoxicology and environmental safety, 30(3), 1995, pp. 283-288
In tests of acute aquatic toxicity, the effects of protolyzing substan
ces varies with pH. The Microtox toxicity of six chlorophenols was stu
died over a pH interval and the relation of effects to dissociation wa
s examined. The pK(a) values of the chlorophenols under the optimal te
st conditions are presented. The results of the Microtox toxicity test
s supported a simple model of two species, phenol and phenate, with di
fferent specific toxicity. In five of the six chlorophenols only the e
ffects of the phenol form were observed. The toxicity of the phenol fo
rm was 20 times or more higher than that of the phenate. (C) 1995 Acad
emic Press, Inc.