当前位置: X-MOL 学术Microchem. J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Optimization and comparison of membrane-protected micro-solid-phase extraction coupled with dispersive liquid-liquid microextraction for organochlorine pesticides using three different sorbents
Microchemical Journal ( IF 4.8 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.microc.2018.09.011
Amir Salemi , Nahid Khaleghifar , Neda Mirikaram

Abstract A micro-solid-phase extraction technique has been developed, for determination of organochlorine pesticides in water media, using gas chromatography-electron capture detector. Response surface methodology was applied to optimize the performance of the extraction technique. Also, the effect of significant experimental parameters (i.e. extraction time, ionic strength, type and volume of the desorption solvent and desorption time) has been studied. Three frequently used solid sorbents; multi-walled carbon nanotube, silica-based C18, and polymeric solid sorbent (LiChrolut® EN), were implemented and independently optimized and the results were compared to find the best extraction setup. A dispersive liquid-liquid extraction procedure was also used to enhance the sensitivity of the method, showing enrichment factors of 14 to 40. The limits of detection of the optimized technique were less than 0.26 μg L−1 (for methoxychlor with C18) and RSD values were between 3.3 and 14.5% at 1 μg L−1. The calibration functions were linear up to 500 μg L−1 with R2 values of more than 0.995, for all sorbents. The figures of merit of the entire procedure showed that each of the studied sorbents could produce satisfactory results in ultra-trace determination organochlorine pesticides in water.

中文翻译:

膜保护微固相萃取联合分散液液微萃取三种不同吸附剂对有机氯农药的优化比较

摘要 开发了一种微固相萃取技术,利用气相色谱-电子捕获检测器测定水介质中的有机氯农药。应用响应面方法来优化提取技术的性能。此外,还研究了重要实验参数(即提取时间、离子强度、解吸溶剂的类型和体积以及解吸时间)的影响。三种常用的固体吸附剂;实施并独立优化了多壁碳纳米管、二氧化硅基 C18 和聚合物固体吸附剂 (LiChrolut® EN),并对结果进行比较以找到最佳提取设置。还使用分散液-液萃取程序来提高方法的灵敏度,显示富集因子为 14 到 40。优化技术的检测限小于 0.26 μg L-1(对于含 C18 的甲氧氯),1 μg L-1 时的 RSD 值介于 3.3 和 14.5% 之间。对于所有吸附剂,校准函数在高达 500 μg L-1 的范围内呈线性,R2 值大于 0.995。整个过程的品质因数表明,所研究的每种吸附剂都能在水中超痕量有机氯农药的测定中产生令人满意的结果。
更新日期:2019-01-01
down
wechat
bug