Toxic influence of two new imidazolium chlorides was examined on plants: dicotyledonous Sinapis alba Linnaeus and monocotyledonous Horde11111 vulgare Linnaeus. These compounds are meant to be new wood preservatives because of their excellent fungicidal properties. They were proved Io be less toxic 10 barley than 10 charlock. The compound 3,3'-[(2,7-dioxyoktymethylene) bis (1-oktyl)imidazolium] chloride was less fitotoxic 10 both plants than l-decyl-3-hexylotiomethylimidazolium chloride.

Investigations were carried out in order to evaluate biodegradability of two pesticides - pure active substance 2,4-dichlorophenoxyacetic acid (2,4 D) and specific preparation created at the base of 2,4-D - Aminopielik 720. Biodegradation was carried out according to OECD standards - Method 301E and 303A. After biodegradation toxicity of intermediates was also determined. Investigated preparations were biodegradable in coupled units test Biodegradation rate, observed at the base of COD standard analysis, was over 90%. Intermediates didn't show significant toxicity with reference to fish, algae and daphnia.