Ago Kero Assefa, Kitte Shimeles Addisu, Chirfa Gadisa, Gure Abera
Department of Chemistry, College of Natural Sciences, Jimma University, P. O. Box 378, Jimma, Ethiopia.
Heliyon. 2023 Jan 14;9(1):e12954. doi: 10.1016/j.heliyon.2023.e12954. eCollection 2023 Jan.
An effervescent powder-assisted floating organic solvent-based dispersive liquid-liquid microextraction was introduced for determination of 13 organochlorine pesticides in water samples. In this method, a less toxic low-density organic solvent was used as extraction solvent. The extraction solvent was dispersed in to the aqueous sample via CO bubbles, generated up on addition of water to a falcon tube containing the mixture of effervescent powder precursors as well as the extraction solvent. Various experimental parameters such as effervescent and its weight fractions, extraction solvent type and its volume, the total mass of effervescent precursors, and the effect of salt were investigated and the optimal conditions were established. Under the optimum conditions, the proposed method exhibited good linearity for all target pesticides with the coefficient of determinations varying from 0.9981 to 0.9997. The limits of detection and quantification were within the range of 0.03-0.24 and 0.26-0.75 μg/L, respectively. The intra- and inter-day precisions which were expressed in terms of the relative standard deviation ranged from 0.33 to 4.47 and 0.51-5.52%, respectively. The enrichment factors and recoveries ranged from 24 to 293 and 76-116%, respectively. The proposed method could be used simple, cheap, fast, and environmentally friendly alternative for analysis of organochlorine pesticides from environmental water and other similar matrices.
本文介绍了一种泡腾粉末辅助的基于浮动有机溶剂的分散液液微萃取方法，用于测定水样中的13种有机氯农药。该方法使用毒性较小的低密度有机溶剂作为萃取溶剂。萃取溶剂通过CO气泡分散到水样中，CO气泡是在向含有泡腾粉末前体混合物以及萃取溶剂的离心管中加水时产生的。研究了各种实验参数，如泡腾剂及其质量分数、萃取溶剂类型及其体积、泡腾前体的总质量以及盐的影响，并确定了最佳条件。在最佳条件下，该方法对所有目标农药均表现出良好的线性，测定系数在0.9981至0.9997之间。检测限和定量限分别在0.03 - 0.24和0.26 - 0.75μg/L范围内。以相对标准偏差表示的日内和日间精密度分别为0.33%至4.47%和0.51%至5.52%。富集因子和回收率分别在24至293和76%至116%之间。该方法可作为一种简单、廉价、快速且环保的替代方法，用于分析环境水样和其他类似基质中的有机氯农药。
