Soil metabolism study is required for the registration of pesticides to the foreign countries, such as the US EPA, EU, and Japan. Therefore, the establishment of soil metabolism study under the GLP system suitable for the registration should be essent...
Soil metabolism study is required for the registration of pesticides to the foreign countries, such as the US EPA, EU, and Japan. Therefore, the establishment of soil metabolism study under the GLP system suitable for the registration should be essential. Based on international test guidelines(especially OECD TG 307) and references, the SOP's on soil metabolism study were made available and the test system set up, resulting in generation of GLP data acceptable for a registration. And then, the case studies were conducted to determine the transfromation rate and identify major metabolites of 14C-K-1114 and 14C-K-2070, a new herbicide developed in Korea, in non-sterilized and seterilized aerobic aquatic soil condition. From the results of soil metabolism study, their potential impact on the environment can be assessed and additional requirements for the risk assessment can be estimated. Initial risk assessment using acute toxicity and physicochemical properties data are conducted to provide information for decision-makers to decide the potential adverse effects and played as a role for decision-making during development of new chemicals. Initial risk assessment is composed of human risk assessment by diet and drinking water and ecological risk assessment for algae, invertebrate and fish which is applied with the different criteria of U.S., EU and Japan. Acute toxicity data using Toxicity estimation program was obtained and exposure assessment was carried by Water Estimation Model (GENEEC, FOCUS). Initial risk assessment of 29 pesticides for case study were carried out to evaluate the framework of initial risk assessment. In addition, 18 new developed pesticides and 22 industrial chemicals were applied with the initial risk assessment.