Effervescence-assisted dispersive liquid-liquid microextraction for extraction and preconcentration of organochlorine pesticides in water samples

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Bulletin of the Chemical Society of Ethiopia Pub Date : 2023-06-30 DOI:10.4314/bcse.v37i5.4

Bereket Tesfaye, Tsegaye Girma Asere, Guyo Jilo Molole, A. Gure

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Abstract

ABSTRACT. In this paper, effervescence-assisted dispersive liquid-liquid microextraction method has been developed for the extraction and preconcentration of organochlorine pesticides in water samples before their determination by gas chromatography-mass spectrometry. The method involves in-situ generation of CO2 bubbles to induce dispersion of the extraction solvent in the aqueous sample. Different parameters affecting the extraction efficiency of the method including the type and concentration of the effervescent agents as well as the type and volume of extraction solvent were optimized. Under optimum conditions, matrix matched calibration curves were constructed at eight concentrations ranging from 0.6–4.0 ng/mL showed good linearity with coefficient of determinations of ≥ 0.9961. The limits of detections and quantifications ranged from 0.2–0.4 and 0.6–1.0 ng/mL, respectively. The intra- and inter-day precisions studied at two concentration levels had below 5% relative standard deviation values. Similarly, recoveries investigated at two concentration levels ranged from 80.7–117.4%. The findings demonstrated that proposed method is simple, rapid, and efficient to be used as alternative method for analysis of organochlorine pesticides from environmental water and other similar matrices. KEY WORDS: Effervescence agents, CO2 bubbles, Organochlorine pesticides, Water samples, gas chromatography-mass spectroscopy Bull. Chem. Soc. Ethiop. 2023, 37(5), 1109-1122. DOI: https://dx.doi.org/10.4314/bcse.v37i5.4

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泡腾辅助分散液液微萃取法提取和预富集水样中有机氯农药

摘要。本文建立了泡腾辅助分散液-液微萃取法，用于水样中有机氯农药的提取和预富集，然后用气相色谱-质谱法测定。该方法包括原位产生CO2气泡以诱导提取溶剂在水性样品中的分散。优化了影响该方法提取效率的不同参数，包括泡腾剂的类型和浓度以及提取溶剂的类型和体积。在最佳条件下，在0.6–4.0 ng/mL的8个浓度范围内构建了基质匹配的校准曲线，显示出良好的线性，测定系数≥0.9961。检测限和定量限分别为0.2–0.4和0.6–1.0 ng/mL。在两个浓度水平下研究的日内和日间精密度的相对标准偏差值低于5%。同样，在两个浓度水平下研究的回收率范围为80.7–117.4%。研究结果表明，所提出的方法简单、快速、有效，可作为分析环境水中和其他类似基质中有机氯农药的替代方法。关键词：发泡剂，二氧化碳气泡，有机氯农药，水样，气相色谱-质谱Bull。化学。Soc.Ethiop。2023,37（5），1109-1122.DOI:https://dx.doi.org/10.4314/bcse.v37i5.4

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来源期刊

Bulletin of the Chemical Society of Ethiopia 化学-化学综合

CiteScore

2.20

自引率

8.30%

发文量

113

审稿时长

6-12 weeks

期刊介绍： The Bulletin of the Chemical Society of Ethiopia (BCSE) is a triannual publication of the Chemical Society of Ethiopia. The BCSE is an open access and peer reviewed journal. The BCSE invites contributions in any field of basic and applied chemistry.