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| 水稻及稻田环境中烯啶虫胺残留消解动态及膳食风险评价 |
| Dynamics, Residue and Risk Assessment of Nitenpyram in Rice and Paddy Field |
| 投稿时间：2016-03-24 |
| DOI：10.13254/j.jare.2016.0077 |
| 中文关键词: 烯啶虫胺 水稻 土壤 消解 风险评价 |
| 英文关键词: nitenpyram paddy soil dissipation risk assessment |
| 基金项目:国家“948”重点项目（2011-G30） |
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| 中文摘要: |
| 为评价烯啶虫胺在水稻中的残留及膳食摄入风险，于山东、河南、安徽进行了两年三地的田间试验。结果表明：烯啶虫胺在水稻和田水中的半衰期分别小于1.4 d和4.2 d，属于易降解农药。糙米最终残留量均低于0.05 mg·kg-1，低于日本设定的最大残留限量（MRL）0.5 mg·kg-1。针对我国不同人群的膳食摄入及风险评估暴露，烯啶虫胺膳食暴露风险低，处于可接受的安全水平。 |
| 英文摘要: |
| Residues dynamics, final residual levels and dietary intake risk of nitenpyram in rice and paddy field were investigated in three dif-ferent regions of China(Shandong, Henan and Anhui). A method was illustrated to detect nitenpyram residues in paddy, plant, brown rice, paddy water and soil. The residues in paddy and rice were extracted with methanol+phosphate buffer(0.2 mol·L-1, pH=7.0)(60+40), adjust pH to 2.5, then cleaned up with solid phase extraction column and 0.22 μm filter membrane, and then analyzed by HPLC with an ul-traviolet detector at 260 nm. When spiked 0.05, 0.5, 1.0 mg·kg-1, the recoveries of nitenpyram in paddy plant and brown rice were 78.4%~94.7% and 84.0%~94.2%, respectively. The residues in paddy water and soil were extracted with phosphate buffer (0.2 mol·L-1, pH=7.0), when spiked 0.01, 0.5, 1.0 mg·kg-1, the recoveries of nitenpyram in paddy water and soil were 84.6%~98.0% and 93.7%~97.1%, respective-ly, which indicated this method match the requirement of the detection. Two years results showed that nitenpyram belongs to easily degraded pesticides, because all half-lives were below 1.4 d in rice plant, as well as below 4.2 d in paddy water. Final residual levels of nitenpyram in rice were all below 0.05 mg·kg-1,which was far below the Japanese maximum residue limit(0.5 mg·kg-1). The risk quotients (RQs) were low for different populations in China, which indicated its low risk in rice. Therefore, the rice with nitenpyram applied, according to the recom-mend method, 45 g·hm-2 application once, with 21 days collection interval, was safe. |
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