title: Comparison of ultrasound-assisted cloud point extraction and ultrasound-assisted dispersive liquid liquid microextraction for copper coupled with spectrophotometric determination.
abstract: In this work, ultrasound-assisted cloud point extraction (UA-CPE) and ultrasound-assisted dispersive liquid liquid microextraction (UA-DLLME) were investigated and compared firstly as ultrasound-assisted liquid phase microextraction methods, which were coupled with spectrophotometer for copper preconcentration and detection. Compared to conventional CPE and DLLME, the extraction patterns were changed and improved by the effect of ultrasound. As novel methods, their applications were expanded and the analytical performance of spectrophotometric determination for copper was considerably improved. The influence factors of UA-CPE and UA-DLLME were studied in detail. Under the optimal conditions, the limits of detection (LODs) for copper were 0.7 μg L(-1) of UA-CPE and 0.8 μg L(-1) of UA-DLLME with sensitivity enhancement factors (EFs) of 17 and 16. The developed methods were applied to the determination of trace copper in real water samples with satisfactory analytical results.
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors: Shengchun
authors: S
authors: Yang
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors: Xiang
authors: X
authors: Fang
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors: Liju
authors: L
authors: Duan
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors: Shu
authors: S
authors: Yang
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China.
authors: Zirong
authors: Z
authors: Lei
authors: College of Pharmacy and Chemistry, Dali University, Dali, Yunnan 671000, China. Electronic address: wenxdong129@163.com.
authors: Xiaodong
authors: X
authors: Wen
mesh_terms: D002253:Carbonated Beverages / Q000032:analysis; D003300:Copper / Q000032:analysis / Q000302:isolation & purification*; D060766:Drinking Water / Q000032:analysis*; D005618:Fresh Water / Q000032:analysis*; D019220:High-Energy Shock Waves; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000379:methods*; D013010:Sonication / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods*; D014465:Ultrasonics / Q000379:methods
chemical_list: D060766:Drinking Water; D003300:Copper
keywords: Copper; Preconcentration; Spectrophotometer; Ultrasound-assisted cloud point extraction; Ultrasound-assisted dispersive liquid liquid microextraction