title: A new coupling of ionic liquid based-single drop microextraction with tungsten coil electrothermal atomic absorption spectrometry.
abstract: In this work, an improved method of ionic liquid based-single drop microextraction (IL-SDME) preconcentration was firstly coupled with tungsten coil electrothermal atomic absorption spectrometry (W-coil ET-AAS) detection. The new coupling was developed and applied for the determination of ultra-trace cadmium. Experimental parameters influencing the performance of IL-SDME as well as instrumental conditions were studied systematically, including IL-drop volume, chelating agent concentration, pH, stirring rate and time, heating program of W-coil ET-AAS, flow rate of carrier gas. Under the optimal conditions, the limit of detection (LOD) for cadmium was 0.015 μg L(-1) (sampling amount on W-coil was 10 μL). The sensitivity enhancement factor was 42, while the improvement factor of LOD was 33. The established method was applied to determine cadmium in standard reference materials of rice and real water samples successfully. The developed IL-SDME-W-coil ET-AAS coupling represents a simple, green and highly sensitive method for cadmium determination.
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China. wenxdong129@163.com
authors: Xiaodong
authors: X
authors: Wen
authors: Qingwen
authors: Q
authors: Deng
authors: Jiwei
authors: J
authors: Wang
authors: Shengchun
authors: S
authors: Yang
authors: Xia
authors: X
authors: Zhao
mesh_terms: D002104:Cadmium / Q000032:analysis*; D004867:Equipment Design; D052578:Ionic Liquids / Q000737:chemistry*; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000295:instrumentation*; D012275:Oryza / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000295:instrumentation*; D014414:Tungsten / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D052578:Ionic Liquids; D014874:Water Pollutants, Chemical; D002104:Cadmium; D014414:Tungsten