Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (3): 366-370.

• Articles • Previous Articles     Next Articles

Determination of Trace Amounts of Nickel(II) by Graphite Furnace Atomic Absorption Spectrometry Coupled with Cloud Point Extraction

SHAH Syed Mazhar1, WANG Hao-nan2 and SU Xing-guang1*   

  1. 1. College of Chemistry,
    2. College of Environment and Resources, Jilin University, Changchun 130012, P. R. China
  • Received:2010-10-18 Revised:2010-12-30 Online:2011-05-25 Published:2011-04-29
  • Contact: SU Xing-guang E-mail:suxg@jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20075009).

Abstract: A new method based on the cloud point extraction(CPE) for separation and preconcentration of nickel(II) and its subsequent determination by graphite furnace atomic absorption spectrometry(GFAAS) was proposed, 8-hydroxyquinoline and Triton X-100 were used as the ligand and surfactant respectively. Nickel(II) can form a hydrophobic complex with 8-hydroxyquinoline, the complex can be extracted into the small volume surfactant rich phase at the cloud point temperature(CPT) for GFAAS determination. The factors affecting the cloud point extraction, such as pH, ligand concentration, surfactant concentration, and the incubation time were optimized. Under the    optimal conditions, a detection limit of 12 ng/L and a relative standard deviation(RSD) of 2.9% were obtained for Ni(II) determination. The enrichment factor was found to be 25. The proposed method was successfully applied to the determination of nickel(II) in certified reference material and different types of water samples and the recovery was in a range of 95%―103%.

Key words: Cloud point extraction, Phase separation, Graphite furnace atomic absorption spectrometry, Nickel(II)