• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of environmental analytical chemistry >Analysis of pesticides in surface water in remote areas in Vietnam: Coping with matrix effects and test of long-term storage stability
【24h】

Analysis of pesticides in surface water in remote areas in Vietnam: Coping with matrix effects and test of long-term storage stability

机译：越南偏远地区地表水中的农药分析：应对基质效应和长期储存稳定性测试

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

During the last years, the increased use of pesticides and growing awareness of associated environmental and health problems have led to the implementation of various monitoring programmes in South-East Asia. The introduction of numerous new active ingredients and commercial pesticide formulations in connection with reports on pesticide-related health problems strongly indicate that the analytical procedures should be tested and evaluated for currently used pesticides. Coping with matrix effects and ensuring pesticide stability when samples are taken in remote areas are paramount. In the present study, we tested an analytical method that targets nine currently used pesticides in surface water in northern Vietnam. The method consists of solid phase extraction, storage at - 18℃ in the adsorbed state, and capillary gas chromatography with nitrogen-phosphorus-detection of five insecticides (dichlorvos, fenobucarb, dimethoate, fenitrothion, and chlorpyrifos), three fungicides (chlorothalonil, metalaxyl, and edifenphos) and one herbicide (atrazine). We evaluated the potential analytical bias caused by matrix effect and investigated its possible causes. We also tested the long-term stability (up to 9 months) of pesticides adsorbed to Carbopack SPE cartridges when stored at temperatures below -18℃. Adopting a matrix-matched calibration technique considerably improved the recovery values of seven of the nine tested pesticides. At spiking levels of 0.1 μg L~(-1) and lug L~(-1) and after storage of 119 days at -18℃, recovery values of these pesticides ranged from 67% to 107% and from 67% to 155%, respectively. For the remaining two pesticides recovered at 53-55% at both spiking levels - dichlorvos and chlorothalonil - the method could still be useful for semi-quantitative analysis or as a screening tool. Even though the general recommendation is to minimise storage time to reduce pesticides degradation, our results showed that storage times up to nine months can be adopted for atrazine, metalaxyl, fenitrothion, and chlorpyrifos.
机译：在过去的几年中，农药使用量的增加以及对相关环境和健康问题的认识不断提高，导致在东南亚实施了各种监测计划。关于农药相关健康问题的报道中引入了许多新的活性成分和商业农药制剂，这强烈表明应该对目前使用的农药进行分析和测试。在偏远地区采集样品时，应对基质效应并确保农药稳定性至关重要。在本研究中，我们测试了一种针对越南北部地表水中目前使用的九种农药的分析方法。该方法包括固相萃取，吸附状态下在-18℃下储存，毛细管气相色谱法和氮磷检测五种杀虫剂（敌敌畏，灭草威，乐果，杀nitro磷和毒死rif），三种杀真菌剂（百菌清，甲霜灵）和乙草磷）和一种除草剂（阿特拉津）。我们评估了由基质效应引起的潜在分析偏差，并研究了其可能的原因。我们还测试了在低于-18℃的温度下存储时，Carbopack SPE滤芯吸附的农药的长期稳定性（长达9个月）。采用基质匹配的校准技术可显着提高九种测试农药中七种的回收率。在峰值水平为0.1μgL〜（-1）和凸耳L〜（-1）且在-18℃下储存119天后，这些农药的回收率分别为67％至107％和67％至155％。 ， 分别。对于在两种加标水平下以53-55％回收的其余两种农药-敌敌畏和百菌清-该方法仍可用于半定量分析或用作筛选工具。尽管一般建议是尽量减少储存时间以减少农药降解，但我们的结果表明，阿特拉津，甲霜灵，杀虫硫磷和毒死rif的储存时间可长达9个月。

著录项

  • 来源
  • 作者

    Maria Anyusheva; Marc Lamers; Klaus Schwadorf; Thilo Streck;

  • 作者单位

    Biogeophysics Section, Institute of Soil Science and Land Evaluation, University of Hohenheim, Emil-Wolff-Strasse 27, 70593 Stuttgart, Germany;

    Biogeophysics Section, Institute of Soil Science and Land Evaluation, University of Hohenheim, Emil-Wolff-Strasse 27, 70593 Stuttgart, Germany;

    State Institute of Agricultural Chemistry, Emil-Wolff-Strasse 14, 70593 Stuttgart, Germany;

    Biogeophysics Section, Institute of Soil Science and Land Evaluation, University of Hohenheim, Emil-Wolff-Strasse 27, 70593 Stuttgart, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pesticide analysis; matrix effect; SPE; storage stability; water matrix;

    机译：农药分析基质效应SPE;储存稳定性;水基质;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号