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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Cationic polyelectrolyte/graphene oxide as an efficient sorbent for the extraction and analysis of trace acidic herbicides in vegetables
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Cationic polyelectrolyte/graphene oxide as an efficient sorbent for the extraction and analysis of trace acidic herbicides in vegetables

机译：阳离子聚电解质/石墨烯作为一种有效的吸附剂，用于蔬菜中痕量酸性除草剂的提取和分析

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摘要

The facile preparation and characterization of a cationic polyelectrolyte (polydiallyldimethylammonium chloride, PDDA) fabricated graphene oxide-grafted silica microsphere (PDDA@GO@Sil) with high positive charge density as the sorbent for the high selective capture of acidic herbicides were reported. The theoretical calculation showed that there were strong adsorption energies between the PDDA and analytes, and the main interaction was the hydrogen bonding from O-H center dot center dot center dot Cl and C=O center dot center dot center dot H-C. Static- and dynamic-state adsorption results indicated that acidic herbicides were the monolayer coverage onto the PDDA@GO@Sil due to the electrostatic attraction between the sorbent and analytes, and electrostatic repulsion among analytes. Under the optimized conditions obtained with the single-factor experiment and response surface methodology, this established method was used for the enrichment and determination of herbicides in two vegetables. Method detection limits were in the range of 0.75-1.50 mu g L-1 indicating that the introduction of PDDA provided the excellent extraction capacity toward acidic herbicides. The obtained results exhibited that the developed method was feasible, reliable, selective and accurate for the determination of acidic herbicides in real samples. (C) 2020 Elsevier B.V. All rights reserved.
机译：据报道，阳离子聚电解质（聚偏二甲基氯化铵，PDDA）制备具有高正电荷密度的石墨烯氧化物 - 接枝二氧化硅微球（PDDA @ GO @ SIL）作为高选择性除草剂的吸附剂的阳离子氧化物接枝二氧化硅微球（PDDA @ GO @ SIL）的化合物制备及表征。理论计算表明，PDDA和分析物之间存在强烈的吸附能，主要相互作用是来自O-H中心点中心点中心点C1和C = O中心点中心点中心点H-C的氢键。静态和动态的吸附结果表明，由于吸附剂和分析物之间的静电吸引，以及分析物之间的静电吸收，酸性除草剂是PDDA @ Go @ Sil上的单层覆盖。在用单因素实验和反应表面方法获得的优化条件下，该制定的方法用于两种蔬菜中的除草剂的富集和测定。方法检测限度为0.75-1.50μgl-1，表明PDDA的引入为酸性除草剂提供了优异的提取能力。所得结果表明，开发方法是可行，可靠，选择性和准确的，用于测定真实样品中的酸性除草剂。 （c）2020 Elsevier B.v.保留所有权利。

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