毒死蜱在我国水稻上登记现状及水生态风险评估

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Abstract In the present study, the current situation of chlorpyrifos products registered for use on rice in China was analyzed and the comprehensive risk assessment of products for aquatic ecosystem were conducted by using the Top-Rice model. It showed that a total of 292 chlorpyrifos formulations (single active component) had been registered for use on rice by May 2019 and these chlorpyrifos products could be grouped into six dosage forms. Among these forms, the emulsifiable concentrates (EC) accounted for the largest portion at 82.5%, followed by the water emulsions (EW) at 12.0%. And the wettable powders (WP), microemulsion (ME), microcapsule suspension (CS) and granules (GR) contributed to the remaining shares at 0.3%, 4.1%, 0.7% and 0.3%, respectively. Based on the conservative principles of risk assessment, application range of different dosage forms of chlorpyrifos and exposure assessment for their use on rice in China were investigated. The results showed that after applying six different dosage forms of chlorpyrifos on rice in different scenarios and seasons, the predicted environmental concentration (PEC) of parent compound chlorpyrifos ranged from 0.7 to 1628.6 μg/L and its metabolites ranged from 0.7 to 1705.9 μg/L. The results of acute risk characterization indicated that the at-risk groups of chlorpyrifos to fish and invertebrates accounted for 76.0% and 90.6%, respectively, of the total simulated group in current application conditions. By contrast, for chronic risk, the at-risk groups of chlorpyrifos to primary producers accounted for 72.9% of the total simulation group. The results of high tiered risk assessment showed that the RQ values of fish, invertebrates and aquatic mesocosm groups were all greater than 1. In summary, the risk to aquatic ecosystems resulted from using currently registered chlorpyrifos products on rice cannot be ignored in China. It should be noted that, in the present study, the method used to analyze the application model of all chlorpyrifos product dosage forms was relatively conservative and the Top-Rice model did not consider the factors affecting the photolysis of chlorpyrifos on the soil surface, therefore to some extent the risk might be underestimated based on the assessment results.

Key words： chlorpyrifos rice aquatic ecosystem risk assessment

Received: 19 January 2020

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X171

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	Articles by authors
	CHEN Shi-hui
	JIANG Jin-lin
	ZHANG Huan-chao
	LIU Ren-bin
	ZHOU Jun-ying
	SHAN Zheng-jun
	BU Yuan-qing

Cite this article:

CHEN Shi-hui,JIANG Jin-lin,ZHANG Huan-chao等. Registration status of chlorpyrifos products for use on rice and its risk assessment for aquatic ecosystem in China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3585-3594.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I8/3585

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