Determination of Ni2+ in Waters with Sodium Polyacrylate as a Binding Phase in Diffusive Gradients in Thin-films

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (4): 703-707.

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Determination of Ni²⁺ in Waters with Sodium Polyacrylate as a Binding Phase in Diffusive Gradients in Thin-films

CHEN Hong^1,2, DONG Jia¹, NIU Yong-xin² and SUN Ting^1*

1. Department of Chemistry, Northeastern University, Shenyang 110004, P. R. China;
2. Department of Applied Chemistry, Liaoning Petrochemical Vocational Technology College, Jinzhou 121001 P. R. China

Received:2010-10-25 Revised:2011-03-28 Online:2011-07-25 Published:2011-06-29
Contact: SUN Ting E-mail:sun1th@163.com

Abstract

Abstract: An aqueous solution containing sodium polyacrylate(PAAS) was used in diffusive gradient in thin-films technique(DGT) to measure DGT-labile Ni2+ concentrations. The DGT devices(PAAS DGT) were validated in four types of solutions, including synthetic river water containing metal ions with complexing EDTA or that without complexing EDTA, natural river water(Ling River, Jinzhou, China) spiked with Ni2+, and an industrial wastewater (Jinzhou, China). Results show that only free metal ions were measured by PAAS DGT, recovery=97.36% in the solutions containing only free metal ions, recovery=49.62% in a solution with metal/EDTA molar ratio of 2:1 and recovery=0 in the solutions with metal/EDTA molar ratios of 1:1 and 1:2. These indicated that the complexes of Ni-EDTA were DGT-inert. The DGT performance in spiked river water(recovery=18.24%) and in industrial wastewater(recovery=12.25%) were investigated, which indicated that the measurement of metals by this DGT device did not include the humic substances complexed fractions of metals. The binding properties of PAAS DGT for Ni2+ were investigated under different conditions of pH value and ionic strength. Conditional stability constants(lgK) of PAAS-Ni complexes were also evaluated.

Key words: Diffusive gradient in thin-film, Sodium polyacrylate, Binding agent, Ni2+

CHEN Hong, DONG Jia, NIU Yong-xin and SUN Ting*. Determination of Ni²⁺ in Waters with Sodium Polyacrylate as a Binding Phase in Diffusive Gradients in Thin-films[J]. Chemical Research in Chinese Universities, 2011, 27(4): 703-707.

References

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Determination of Ni²⁺ in Waters with Sodium Polyacrylate as a Binding Phase in Diffusive Gradients in Thin-films

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