土壤理化性质对草甘膦残留检测的影响

发布时间：2018-06-04 00:50

本文选题：草甘膦 + 土壤　；参考：《生态与农村环境学报》2017年09期

【摘要】：在土壤环境中草甘膦极易被土壤颗粒吸附,并与土壤中有机质、金属氧化物等反应,对草甘膦的检测造成影响。采用磷酸钠和柠檬酸三钠混合溶液超声提取、正己烷萃取净化、氯甲酸-9-芴基甲酯(FMOC-Cl)衍生化、液相色谱-荧光检测器测定的方法,分别探究了腐殖酸含量、重金属离子含量以及土壤pH值对草甘膦检测方法的影响。结果表明,随着土壤中有机质含量增加,草甘膦的回收率逐渐降低;在土壤pH值为3~11范围内,随着pH值增加,草甘膦的回收率总体呈增加趋势,在pH值为8~9时取得最大值,当pH值9时回收率又有所降低;土壤中的重金属离子Cu~(2+)、Fe~(2+)、Fe~(3+)、Zn~(2+)和Ni~(2+)可以与草甘膦形成稳定的络合物,使回收率降低,而重金属离子Co~(2+)和Mn~(2+)对草甘膦检测没有影响。该研究建立的土壤和沉积物中草甘膦的标准检测方法能够满足各种类型土壤和沉积物的检测要求。
[Abstract]:Glyphosate is easily adsorbed by soil particles in soil environment and reacted with organic matter and metal oxides in soil, which has an effect on the detection of glyphosate. The content of humic acid was investigated by ultrasonic extraction of sodium phosphate and trisodium citrate, extraction and purification of n-hexane, derivation of chloroformate-9-fluorenyl methyl ester FMOC-Cl, and determination of humic acid by liquid chromatography-fluorescence detector. Effects of heavy metal ion content and soil pH on glyphosate detection method. The results showed that the recovery rate of glyphosate decreased gradually with the increase of organic matter content in soil, and the recovery rate of glyphosate increased with the increase of pH value in the range of pH 3 ~ 11, and reached the maximum value in pH range of 8 ~ 9. When pH value was 9, the recovery rate was decreased, and the heavy metal ions Cu~(2 and Ni~(2 could form stable complexes with glyphosate, but the heavy metal ions Co~(2) and Mn~(2) had no effect on the detection of glyphosate. The standard method for the detection of glyphosate in soil and sediment can meet the requirements of various types of soil and sediment.
【作者单位】：南京理工大学化工学院;环境保护部南京环境科学研究所;国家环境保护农药环境评价与污染控制重点实验室;
【基金】：国家环境保护标准项目(2015-22)
【分类号】：X131.3;X833

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