: Schäfer, H.; Hettler, H.; Fritsche, U.; Pitzen, G.; Röderer, G.; Wenzel, A.

Abstract
Test systems for predicting long-term effects with the freshwater algae Chlamydomonas reinhardi and Scenedesmus subspicatus and the ciliate Tetrahymena pyriformis were evaluated with respect to the following reference chemicals: atrazine, bromacil, diuron, methylparathion, lindane, 3,4-dichloraniline, pentachlorphenol, cadmium, copper and the volatile 1,2-dichloropropane. The data obtained from these toxicity tests provide information about effects on organisms representing different levels of the aquatic food web, possessing differences in sensitivity against toxicants. The presented flowthrough system allows the testing of volatile and instabile chemicals, problematic in static test systems.