Abstract
A short comparative study has been made on the sensitivity of 2 conventional bioassays (the ISO Daphnia magna immobilization test and the ISO algal growth inhibition test with Scenedesmus quadricauda) and 3 Toxkit microbiotests: the Daphtoxkit F™ magna, also with D. magna, the Thamnotoxkit F™ with the crustacean Thamnocephalus platyurus, and the Algaltoxkit F™ assay with Selenastrum capricornutum. (presently renamed Raphidocelis subcapitata). The tests were performed on the reference chemical potassium dichromate and a real world sample: a leachate of fly ash. The results showed good correlation between the 2 algal test procedures for potassium dichromate, but not for the fly ash leachate, which may be due to the use of 2 different algal species in the test procedures… The tests with both D. magna tests on fly ash leachate gave quite comparable results, but diverging results were found for potassium dichromate. The latter differences can be explained by the (unintentional) lower water hardness which was discovered in the Toxkit assay. The anostracan crustacean T. platyurus appeared to be more sensitive than the cladoceran D. magna for potassium dichromate, but not for the fly ash leachate.
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