깔따구(Chironomus riparius )와 조각깔따구(Glyptotendipes tokunagai )에 대한 Buprofezin 급성독성 평가

Buprofezin is a thiadiazine insecticide that functions as an insect growth regulator, exerting its insecticidal effect by inhibiting chitin biosynthesis. In Korea, it is commonly used as a pesticide to control planthoppers, greenhouse whiteflies, and scale insects on various crops. Despite its low water solubility, buprofezin has a high affinity for soil particles and can accumulate in sediments within aquatic environments, posing a potential risk to non-target aquatic species. This study evaluated the acute toxicity of buprofezin on two species: the OECD standard species Chironomus riparius and the native species Glyptotendipes tokunagai. Acute toxicity tests were conducted following OECD guideline 235, and median lethal concentrations (LC 50 ) were calculated using the US EPA probit analysis software. The results showed a 24-hour LC 50 of 1.587-2.560 mg/L and a 48-hour LC 50 of 0.471-1.421 mg/L for C. riparius, while G. tokunagai demonstrated higher sensitivity, with a 24-hour LC 50 of 0.679-1.143 mg/L and a 48-hour LC 50 of 0.536-0.936 mg/L. These findings suggest that both C. riparius and the native G. tokunagai are suitable species for assessing pesticide risk in aquatic environments.