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Simultaneous preconcentration of copper and mercury in water samples by cloud point extraction and their determination by inductively coupled plasma atomic emission spectrometry.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2012-09-18)
Hamta Shoaee, Mina Roshdi, Nasibeh Khanlarzadeh, Asadollah Beiraghi
ABSTRACT

A cloud-point extraction process coupled to ICP-OES by using 3-nitro benzaldehyde thiosemicarbazone (3-NBT) as complexing agent was developed for the simultaneous preconcentration and determination of copper and mercury in water samples. The variables affecting the complexation and extraction steps were optimized. Under the optimum conditions (i.e. 1.5×10(-5) mol L(-1) ligand, 0.3% (v/v) Triton X-114, 55 °C equilibrium temperature, incubation time of 30 min) the calibration graphs were linear in the range of 5-120 and 10-100 ng mL(-1) with enhancement factor of 82.7 and 51.3 for Cu(2+) and Hg(2+), respectively. The preconcentration factors were 28.6 in both cases and detection limits were obtained 0.48 for Cu and 1.1 ng mL(-1) for Hg. The precisions (R.S.D.%) for five replicate determinations at 50 ng mL(-1) of copper and mercury were better than 1.8% and 3.2%, respectively. The accuracy of the proposed method is validated by analyzing a certified reference material of water (RTC-QCI-049) with satisfactory results. Finally, the proposed method was utilized successfully for the determination of copper and mercury in surface water (river), tap water and bottled mineral water samples.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
IGEPAL® CA-630, for molecular biology
Sigma-Aldrich
IGEPAL® CA-630, viscous liquid
Sigma-Aldrich
Triton X-114, laboratory grade
Supelco
IGEPAL® CA-630
Sigma-Aldrich
Triton X-405 solution, 70% in H2O
Sigma-Aldrich
Triton X-114
Sigma-Aldrich
IGEPAL® CA-720, average Mn ~735
Sigma-Aldrich
Triton X-165 solution