离心式微流控液相萃取法测定水和土壤中油和油脂

现场便携式快速分析仪测定液体固体中的各种污染物,越来越成为人们的实际需求。如水和土壤中的油和油脂（OG）,会引起环境污染,威胁公共健康。微流控设备,由于其试剂消耗低、成本低、分析时间短、所需能量和空间小、经济、环境安全,使得分析方法发生着潜在的革命性变化,几个环境样品的同时制备和分析都在一个集成光盘上进行的离心式微流控系统分析能力越来越为人们熟知。在磁力驱动下,通过＂可动磁铁＂的有效搅拌完成液相和液固萃取,磁力驱动样品制备单元集合固体分析的沉积/过滤,以及最终液体或固体样品的检测池于一个光盘上,对水和土壤中的OG进行萃取,以四氯乙烯代替氟里昂113和四氯化碳为萃取溶剂,实现了OG的红外法检测,检出限为11μg.mL-1。

Determination of Oil and Grease in Water and Soil by Liquid Extraction on a Centrifugal Microfluidic Device

There is a need for field portable analyzers to rapidly test both liquids and solids for a variety of contaminants.Among these con-taminants are oil and grease（OG）in water and soil samples.These compounds cause environmental degradation and are public health risks.Microfluidic devices have the potential for revolutionizing analytical methods due to their low consumption of reagents,low production costs,short analysis time and minimal power and space requirements,making them very attractive economically and environmentally.While the growing analytical capabilities of centrifugal microfluidic systems are becoming well known,few prepare and analyze environmental samples on the same integrated device.Liquid-liquid extraction and solid-liquid extraction were achieved in our experiments using a magnetically driven extraction with ＂mobile magnets＂ to efficiently agitate samples to enhance the extraction process.This magnetically driven sample preparation unit was integrated on the centrifugal device with a sedimentation/filtration unit in the case of solid analysis as well as with an in-tegrated detection cell for both liquid and solid analysis.The extraction of OG from water and soil samples on the centrifugal microfluidic de-vices was presented.Tetrachloroethylene was used as the extractant as a Freon 113 substitute.OG was detected by IR spectrophotography,and a detection limit of 11 μg.mL-1 was obtained.