...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of environmental science and health >Distribution of organophosphate insecticides in a Thai biomass-water system
【24h】

Distribution of organophosphate insecticides in a Thai biomass-water system

机译：泰国生物质-水系统中有机磷杀虫剂的分布

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sorption and leaching of the organophosphate (OP) pesticides chlorpyrifos, profenofos, methyl parathion and malathion were investigated with four different types of biomass: coconut husk, rice husk, peat moss and peanut shell. Organic carbon contents of the biomass were in the range of 35.4-45.4%. Sorption studies were carried out by the batch (equilibrium) method at 4 different OP spike concentrations and at pH 3-7. Sorption isotherms conformed to a linear Freundlich equation and the Freundlich constant or sorption coefficient (K_D) confirmed that biomass organic carbon content was the principal sorbent factor affecting OP sorption. For a given sorbent, correlation of the extent of sorption with sorbate chemical properties was examined. Column leaching experiments involving different masses of coconut husk and peanut shell pre-spiked with OPs at the level equivalent to actual spraying concentrations in some Thai tangerine orchards were conducted. These experiments included repeated spikings and leaching. A water flow rate of 20 mL min~(-1) was employed corresponding to the current average watering regime. Retardation and biodegradation with these sorbents were also examined.
机译：用四种不同类型的生物量研究了有机磷（OP）农药毒死rif，普罗诺磷，甲基对硫磷和马拉硫磷的吸附和浸出：椰子壳，稻壳，泥炭藓和花生壳。生物质的有机碳含量在35.4-45.4％的范围内。吸附研究是通过分批（平衡）方法在4种不同的OP峰浓度和pH 3-7下进行的。吸附等温线符合线性Freundlich方程，并且Freundlich常数或吸附系数（K_D）证实生物量有机碳含量是影响OP吸附的主要吸附因子。对于给定的吸附剂，检查了吸附程度与吸附剂化学性质的相关性。进行了柱浸试验，涉及到不同质量的椰子皮和花生壳预加OP的量，其水平相当于一些泰国橘园中的实际喷洒浓度。这些实验包括重复的加标和浸出。对应当前平均浇水方式，采用20 mL min〜（-1）的水流量。还研究了这些吸附剂的延迟和生物降解。

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