Hollow Fiber-Supported ZIF-8@GO Reinforced Sol-Gel for Preconcentration of Paraquat Before Determination by UV-Vis Spectrophotometry.

IF 2.3 3区 化学 Q3 CHEMISTRY, ANALYTICAL
Journal of Analytical Methods in Chemistry Pub Date : 2025-06-21 eCollection Date: 2025-01-01 DOI:10.1155/jamc/6883692
Narges Vaezi, Naser Dalali
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引用次数: 0

Abstract

A novel, sensitive, and efficient method was developed for the determination of paraquat in soil samples, centered on solid-phase microextraction using hollow fiber-supported ZIF-8@GO reinforced sol-gel combined with UV-Vis spectrophotometry at 257 nm. Silica-based ZIF-8@GO was synthesized through sol-gel technology by reacting tetraethyl orthosilicate (TEOS) with hydrochloric acid (HCl) as a catalyst. The resulting solution was injected into hollow polypropylene fiber segments for in situ gelation. Key microextraction parameters, such as the donor phase pH and volume, stirring rate, extraction time, and desorption conditions (solvent type and volume), were systematically studied and optimized. Under optimal conditions, the method demonstrated linearity within the range of 0.5-2000 μg L-1, with a correlation coefficient of 0.999. The relative standard deviation for seven replicate measurements at a concentration of 600 μg L-1 paraquat was 0.4%. A preconcentration factor of 631 and a detection limit of 0.15 μg L-1 were achieved. Validation of the method was conducted by analyzing soil samples from various sites, yielding recoveries between 96% and 105% with low relative standard deviations, indicating its high accuracy and reliability in detecting trace levels of paraquat.

中空纤维支撑ZIF-8@GO增强溶胶-凝胶在紫外可见分光光度法测定前的预富集。
建立了一种新型、灵敏、高效的测定土壤样品中百草枯的方法,以中空纤维支撑ZIF-8@GO增强溶胶-凝胶固相微萃取- 257 nm紫外可见分光光度法为核心。以正硅酸四乙酯(TEOS)和盐酸(HCl)为催化剂,采用溶胶-凝胶技术合成了硅基ZIF-8@GO。将所得溶液注入中空聚丙烯纤维段中进行原位凝胶化。系统地研究和优化了微萃取关键参数,如供体相pH和体积、搅拌速率、萃取时间和解吸条件(溶剂类型和体积)。在最佳条件下,该方法在0.5 ~ 2000 μ L-1范围内呈良好的线性关系,相关系数为0.999。在600 μg L-1百草枯浓度下,7次重复测量的相对标准偏差为0.4%。预富集系数为631,检出限为0.15 μg L-1。通过对不同地点土壤样品的分析,验证了该方法的有效性,回收率在96% ~ 105%之间,相对标准偏差较低,表明该方法在检测痕量百草枯方面具有较高的准确性和可靠性。
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来源期刊
Journal of Analytical Methods in Chemistry
Journal of Analytical Methods in Chemistry CHEMISTRY, ANALYTICAL-ENGINEERING, CIVIL
CiteScore
4.80
自引率
3.80%
发文量
79
审稿时长
6-12 weeks
期刊介绍: Journal of Analytical Methods in Chemistry publishes papers reporting methods and instrumentation for chemical analysis, and their application to real-world problems. Articles may be either practical or theoretical. Subject areas include (but are by no means limited to): Separation Spectroscopy Mass spectrometry Chromatography Analytical Sample Preparation Electrochemical analysis Hyphenated techniques Data processing As well as original research, Journal of Analytical Methods in Chemistry also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.
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