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首页> 外文期刊>Journal of Applied Polymer Science >Trace bensulfuron-methyl analysis in tap water, soil, and soybean samples by a combination of molecularly imprinted stir bar sorption extraction and HPLC-UV
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Trace bensulfuron-methyl analysis in tap water, soil, and soybean samples by a combination of molecularly imprinted stir bar sorption extraction and HPLC-UV

机译：结合分子印迹搅拌棒吸附萃取和HPLC-UV对自来水，土壤和大豆样品中的痕量苯磺隆进行甲基分析

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摘要

A molecularly imprinted stir bar was prepared using bensulfuron-methyl as the template molecule and methacrylic acid as the functional monomer. The imprinted and nonimprinted stir bars were characterized by scanning electron microscopy, nitrogen sorption porosimetry, thermogravimetric analysis, and differential scanning calorimetry. Extraction time, desorption time and pH value affecting extraction efficiency of the stir bar have been evaluated to achieve the selectively direct preconcentration of the template from aqueous samples. Competitive sorption experiments demonstrated that the imprinted stir bar gave high selectivity and imprinted effect on the template bensulfuron-methyl compared to the nonimprinted stir bar. Based on S/N of 3, LOD was 0.83 nM. The method showed good recoveries and precision, 92.4% (RSD 1.5%, n = 3) for tap water spiked with 126 ng (100 mL sample), 84.6% (RSD 2.2%, n = 3) for soil spiked with 210 ng (100 g sample) and 73.7% (RSD 2.1%, n = 3) for soybean spiked with 250 ng (5 g sample), suggesting that the imprinted stir bar sorption extraction can be successfully applied to the preconcentration of bensulfuron-methyl in real samples.
机译：以苄嘧磺隆为模板分子，以甲基丙烯酸为功能单体，制备了分子印迹搅拌棒。通过扫描电子显微镜，氮气吸附孔隙率法，热重分析和差示扫描量热法对压印和非压印搅拌棒进行表征。已经评估了萃取时间，解吸时间和影响搅拌棒萃取效率的pH值，以实现从含水样品中选择性直接预浓缩模板。竞争性吸附实验表明，与非印迹搅拌棒相比，印迹搅拌棒对模板苯磺隆有较高的选择性和印迹效果。基于3的S / N，LOD为0.83 nM。该方法具有良好的回收率和精密度，加标126 ng（100 mL样品）的自来水为92.4％（RSD 1.5％，n = 3），加标为210 ng（100 g）的土壤为84.6％（RSD 2.2％，n = 3）。 250 ng（5 g样品）加标的大豆为100 g样品）和73.7％（RSD 2.1％，n = 3），表明印迹搅拌棒吸附萃取可成功地用于实际样品中苯磺隆的甲基富集。

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