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Determination of cadmium(II), cobalt(II), nickel(II), lead(II), zinc(II), and copper(II) in water samples using dual-cloud point extraction and inductively coupled plasma emission spectrometry.

Journal of hazardous materials (2012-09-22)
Lingling Zhao, Shuxian Zhong, Keming Fang, Zhaosheng Qian, Jianrong Chen
ABSTRACT

A dual-cloud point extraction (d-CPE) procedure has been developed for simultaneous pre-concentration and separation of heavy metal ions (Cd2+, Co2+, Ni2+, Pb2+, Zn2+, and Cu2+ ion) in water samples by inductively coupled plasma optical emission spectrometry (ICP-OES). The procedure is based on forming complexes of metal ion with 8-hydroxyquinoline (8-HQ) into the as-formed Triton X-114 surfactant rich phase. Instead of direct injection or analysis, the surfactant rich phase containing the complexes was treated by nitric acid, and the detected ions were back extracted again into aqueous phase at the second cloud point extraction stage, and finally determined by ICP-OES. Under the optimum conditions (pH=7.0, Triton X-114=0.05% (w/v), 8-HQ=2.0×10(-4) mol L(-1), HNO3=0.8 mol L(-1)), the detection limits for Cd2+, Co2+, Ni2+, Pb2+, Zn2+, and Cu2+ ions were 0.01, 0.04, 0.01, 0.34, 0.05, and 0.04 μg L(-1), respectively. Relative standard deviation (RSD) values for 10 replicates at 100 μg L(-1) were lower than 6.0%. The proposed method could be successfully applied to the determination of Cd2+, Co2+, Ni2+, Pb2+, Zn2+, and Cu2+ ion in water samples.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
8-Hydroxyquinoline, ACS reagent, 99%
Sigma-Aldrich
8-Quinolinol hemisulfate salt, ≥98.0% (dry substance, T), yellow
Sigma-Aldrich
8-Hydroxyquinoline, crystalline
Sigma-Aldrich
Triton X-405 solution, 70% in H2O
Sigma-Aldrich
IGEPAL® CA-630, viscous liquid
Sigma-Aldrich
IGEPAL® CA-630, for molecular biology
Sigma-Aldrich
Triton X-114, laboratory grade
Sigma-Aldrich
Triton X-165 solution
Supelco
8-Quinolinol, PESTANAL®, analytical standard
Supelco
IGEPAL® CA-630
Sigma-Aldrich
8-Quinolinol, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99% (perchloric acid titration)
Sigma-Aldrich
IGEPAL® CA-720, average Mn ~735
Sigma-Aldrich
Triton X-114