Abstract
Comparative toxicity of hexachlorobenzene, 1,2,3-trichlorobenzene, bromobenzene, and chlorobenzene on the growth, protein concentration, ATP content and relevant enzyme activities of the unicellular green alga Selenastrum capricornutum was studied. Five typical molecular descriptive parameters: E homo, 1 χ v, K ow, E s, π x of these organic chemicals were selected to study the structure and bio-activities of the four halogeno-benzenes. The results indicated that the protein concentration, activities of G6PDH and AP, and ATP content were more sensitive to halogeno-benzenes than dry weight. Among the four halogeno-benzenes, the order of toxicity on the alga was: hexachlorobenzene>1,2,3-trichlorobenzene>bromobenzene>chlorobenzene. There was a good correlation between the molecular structure of halogeno-benzenes and their biochemical toxicity.
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