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首页> 外文期刊>Journal of separation science. >Preparation of a graphene oxide/silica composite modified with nitro-substituted tris(indolyl)methane as a solid-phase extraction sorbent for the extraction of organic acids
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Preparation of a graphene oxide/silica composite modified with nitro-substituted tris(indolyl)methane as a solid-phase extraction sorbent for the extraction of organic acids

机译：以硝基取代的三（吲哚基）甲烷为固相萃取吸附剂改性的氧化石墨烯/二氧化硅复合材料的制备

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摘要

This paper describes the use of graphene oxide/silica modified with nitro-substituted tris(indolyl) methane as a solid-phase extraction sorbent for the determination of organic acids. The resultant graphene oxide/silica modified with nitro-substituted tris(indolyl) methane was characterized by FTIR spectroscopy and adsorption experiments. Solid-phase extraction parameters such as sorbent type, sample solution pH, sample loading rate, eluent salt concentration, eluent methanol concentration, elution rate, sample loading, and elution volume were optimized. The method showed good precision, accuracy, sensitivity, and linear response for organic acids analysis over a concentration range of 1-100 mu g/L for benzoic acid, p-methoxybenzoic acid, and salicylic acid and 5-100 mu g/L for the remaining organic acids (cinnamic acid, p-chlorobenzoic acid, and p-bromobenzoic acid) with coefficients of determination (r(2)) of higher than 0.9957. Limits of detection from 0.50 to 1.0 mu g/L for six organic acids were achieved. The developed method was successfully applied to determine organic acids in real samples.
机译：本文介绍了使用硝基取代的三（吲哚基）甲烷改性的氧化石墨烯/二氧化硅作为固相萃取吸附剂测定有机酸的方法。通过FTIR光谱和吸附实验对所得的氧化石墨烯/经硝基取代的三（吲哚基）甲烷改性的二氧化硅进行了表征。优化了固相萃取参数，例如吸附剂类型，样品溶液pH，样品上样速率，洗脱盐浓度，洗脱液甲醇浓度，洗脱速率，样品上样量和洗脱体积。该方法在有机酸分析的浓度范围为苯甲酸，对甲氧基苯甲酸和水杨酸1-100μg / L和5-100μg/ L的浓度范围内显示出良好的精密度，准确性，灵敏度和线性响应。其余的有机酸（肉桂酸，对氯苯甲酸和对溴苯甲酸）的测定系数（r（2））高于0.9957。六种有机酸的检出限从0.50至1.0μg / L。所开发的方法已成功应用于实际样品中有机酸的测定。

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