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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Mixed-mode solid-phase extraction coupled with liquid chromatography tandem mass spectrometry to determine phenoxy acid, sulfonylurea, triazine and other selected herbicides at nanogram per litre levels in environmental waters
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Mixed-mode solid-phase extraction coupled with liquid chromatography tandem mass spectrometry to determine phenoxy acid, sulfonylurea, triazine and other selected herbicides at nanogram per litre levels in environmental waters

机译：混合模式固相萃取结合液相色谱串联质谱法在环境水中以纳克每升的水平测定苯氧酸，磺酰脲，三嗪和其他选定的除草剂

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摘要

The method presented uses a mixed-mode anion exchange SPE and liquid chromatography tandem mass spectrometry to analyze 5 sulfonylurea, 8 phenoxy acid, 12 triazine and 6 other herbicides in environmental waters. The mixed-mode SPE cartridge is able to retain a wide range of herbicides with acidic-neutral-basic characteristics, particularly the highly polar and acidic compounds clopyralid, dicamba and picloram. The neutral and basic herbicides can be effectively eluted with methanol, after which the acidic herbicides can be eluted using acidified methanol. The method has achieved an LOD of 0.7-3 ng/L for the sulfonylureas, 4-12 ng/L for the phenoxy acids and 0.4-30 ng/L for the triazine and additional herbicides, with recoveries in the range 76-107%, 73-126%, and 65-104%, respectively. The precision of the method, calculated as relative standard deviation (RSD), was below 10% for both sulfonylurea and phenoxy acid herbicides, and less than 20% for the remaining herbicides. The developed method was used to determine the concentration of target herbicides in a range of environmental waters, and many of the target herbicides were detected at ng/L level.
机译：提出的方法使用混合模式阴离子交换固相萃取和液相色谱串联质谱分析环境水中的5种磺酰脲，8种苯氧基酸，12种三嗪和6种其他除草剂。混合模式SPE滤芯能够保留多种具有酸性-中性-碱性特征的除草剂，尤其是高极性和酸性化合物氯吡格雷，麦草畏和吡咯烷。中性和碱性除草剂可用甲醇有效洗脱，然后可以使用酸化的甲醇洗脱酸性除草剂。该方法的磺酰脲类LOD为0.7-3 ng / L，苯氧基酸为4-12 ng / L，三嗪和其他除草剂的LOD为0.4-30 ng / L，回收率在76-107％之间，73-126％和65-104％。以相对标准偏差（RSD）计算的方法精度，磺酰脲和苯氧酸除草剂均低于10％，其余除草剂均低于20％。所开发的方法用于确定一系列环境水中目标除草剂的浓度，并且许多目标除草剂的检测浓度均为ng / L。

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