| Abstrakt: |
This study investigated the concentration distribution characteristics and environmental risk assessment of 17 newly-used organochlorine pesticides in Huangpu River. In a total of 22 water samples, except for three newly-used organochlorine pesticides of Tecnazene, Methoxychlor and Quinoxyfen which were not detected, 14 other newly-used organochlorine pesticides were detected. Concentrations of the all organochlorine pesticides ranged from 0.272 to 0.924 ng/L (median: 0.467 ng/L) in all water samples, with higher concentrations of clomazone and oxadiazon. In addition, oxadiazon exhibited a significant and gradual downward trend in the upper reaches of the River, and the changing trend was basically in line with the first-order kinetics, with the half-life of 36.87 h (R²=0.73,P=0.024). The average ecological environmental risk coefficient (RQ) of newly-used organochlorine pesticides in Huangpu River is 0.001 3, indicating that the overall ecological environmental risk is still at a very low level. [ABSTRACT FROM AUTHOR] |
