title: Comparison of rapidly synergistic cloud point extraction and ultrasound-assisted cloud point extraction for trace selenium coupled with spectrophotometric determination.
abstract: In this work, rapidly synergistic cloud point extraction (RS-CPE) and ultrasound-assisted cloud point extraction (UA-CPE) were firstly compared and coupled with spectrophotometer for selenium preconcentration and detection. The established RS-CPE pretreatment was simple, rapid and high effective. The extraction time was only 1min without heating process. Under the effect of ultrasound, UA-CPE accomplished extraction efficiently although the extraction procedure was relatively time-consuming. In this study, RS-CPE and UA-CPE were firstly applied for selenium preconcentration and coupled with conventional spectrophotometer. Their applications were expanded and the analytical performance of spectrophotometric determination for selenium was considerably improved. The influence factors relevant to RS-CPE and UA-CPE were studied in detail. Under the optimal conditions, the limits of detection (LODs) for selenium were respectively 0.2μgL(-1) of RS-CPE and 0.3μgL(-1) of UA-CPE with sensitivity enhancement factors (EFs) of 124 and 103. The developed methods were applied to the determination of trace selenium in real water samples with satisfactory analytical results.
authors.affiliation: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China. Electronic address: wenxdong129@163.com.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Wen
authors.affiliation: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Li
authors.affiliation: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Fang
authors.affiliation: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors.forename: Xiaocan
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D005591:Chemical Fractionation / Q000379:methods; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000032:analysis*; D057230:Limit of Detection; D017830:Octoxynol; D011092:Polyethylene Glycols / Q000737:chemistry; D012643:Selenium / Q000032:analysis / Q000302:isolation & purification*; D013053:Spectrophotometry / Q000379:methods; D014465:Ultrasonics / Q000379:methods
chemical_list: D002614:Chelating Agents; D011092:Polyethylene Glycols; D017830:Octoxynol; C010615:Nonidet P-40; D012643:Selenium
keywords: Preconcentration; Rapidly synergistic cloud point extraction; Selenium; Spectrophotometric determination; Ultrasound-assisted cloud point extraction