...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Micellar catalyzed degradation of fenitrothion, an organophosphorus pesticide, in solution and soils
【24h】

Micellar catalyzed degradation of fenitrothion, an organophosphorus pesticide, in solution and soils

机译：胶束催化溶液和土壤中的有机磷农药杀fe磷

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

We report on a study of the decomposition of fenitrothion (an organophosphorus pesticide that is a persistent contaminant in soils and groundwater) as catalyzed by cetyltrimethylammoniurn (CTA(+)) micelles. The CTA micelles were associated with two types of counterions: (1) inert counterions (e.g. CTABr) and (2) reactive counterions (e.g. CTAOH). The reactive counterion surfactants used were hydroxide anion (HO-) as a normal nucleophile and hydroperoxide anion (HOO-) and the anion of pyruvaldehyde oxime (MINA(-)) as two alpha-nucleophiles. The reactivity order followed: CTABr < CTAOH < CTAMINA CTAOOH. Treatment of the rate data using the Pseudo-Phase Ion Exchange (PPIE) model of micellar catalysis showed the ratio k(2M)/k(2W) to be less than unity for all the surfactants employed. Rather than arising from a "true catalysis", we attributed the observed rate enhancements to a "concentration effect", where both pesticide and nucleophile were incorporated into the small micellar phase volume. Furthermore, the CTAOOH/CTAOH pair gave an alpha-effect of 57, showing that the alpha-effect can play an important role in micellar systems. We further investigated the effectiveness of reactive counterion surfactants in decontaminating selected environmental solids that were spiked with 27 ppb fenitrothion. The solids were as follows: the clay mineral montmorillonite and SO-1 and SO-2 soils (obtained from the Canadian Certified Reference Materials Project). The reactive counterion surfactant solutions significantly enhanced the rate of fenitrothion degradation in the spiked solids over that obtained when the spiked solid was placed in contact with either 0.02 M KOH or water. The rate enhancements followed the order CTAOOH CTAMINA similar to CTAOH > KOH water. We conclude that reactive counterion surfactants, especially with alpha-nucleophiles, hold great potential in terms of remediating soils contaminated by toxic organophosphorus esters.
机译：我们报告了关于十六烷基三甲基铵（CTA（+））胶束催化的杀nitro硫磷（一种有机磷农药，是土壤和地下水中的持久性污染物）的分解研究。 CTA胶束与两种类型的抗衡离子相关：（1）惰性抗衡离子（例如CTABr）和（2）反应性抗衡离子（例如CTAOH）。所使用的反应性抗衡离子表面活性剂是作为正常亲核试剂的氢氧根阴离子（HO-）和作为两种α-亲核试剂的氢过氧化物阴离子（HOO-）和丙酮醛肟的阴离子（MINA（-））。反应顺序如下：CTABr KOH 水。我们得出的结论是，反应性抗衡离子表面活性剂，尤其是具有α-亲核试剂的表面活性剂，在修复被有毒有机磷酯污染的土壤方面具有巨大潜力。

著录项

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