Abstract
Alginate-immobilized and free Selenastrum capricornutum Printz cells were compared for use in algal toxicity assays. Chemicals investigated were cadmium, copper, Glyphosate, Hydrothol, Paraquat, pentachlorophenol, and sodium dodecyl sulfate. Toxicity was characterized in terms of growth inhibition, with growth measured by in vitro chlorophyll fluorescence. Sensitivity of the immobilized and free algal assays to copper, cadmium and pentachlorophenol was similar. However, immobilization substantially reduced the toxicity of Hydrothol, Paraquat, and Glyphosate to the algae. Sodium dodecyl sulfate disrupted the alginate matrix and therefore its toxicity could not be determined successfully with the immobilized algal assay.
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