Environmental toxicological investigations on a new Hungarian acaricide molecule

The authors summarise the environmental toxicological investigations and their results of a new Hungarian acaricide molecule (SZI-121) developed by the CHINOIN. The toxicological effects of the test item on different ecotoxicological test systems were investigated in the following tests: Bacterium, alga, and plant growth inhibition tests, acute immobilisation and 21 days reproduction tests on Daphnia magna, acute fish test, closed bottle test, mobility, aerob degradation and adsorption/desorption tests on three different soils. No toxic effect was found in the bacterium, alga, plant growth inhibition and acute fish tests in the highest concentrations used. In the Daphnia immobilisation test applied in the concentration range of 0.0128-40 mg/L, the LC sub(50) value was 0.14 mg/L. The test item showed similar characteristics as the reference item during the mobility test in soils, the adsorption/desorption study and the degradation investigations. In order to determine the environmental degradation rate further degradation investigations, as well as the nitrogen mineralisation test and the model of concentration change in natural waters were performed.