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  • Chem Sci Trans., 2012, 1(3),  pp 582-589  

    DOI:10.7598/cst2012.236

    Research Article

    H-Point Standard Addition Method for Simultaneous Determination of Zinc and Nickel in Micellar Media

  • RAJNI ROHILLA and USHA GUPTA*
  • Department of Chemistry, Punjabi University Patiala, Punjab, India
  • Abstract

    The H-point standard addition method (HPSAM) has been applied for simultaneous determination of Zn(II) and Ni(II) at trace levels, using Alizarin Red S (ARS) as chromogenic reagent. Both Ni(II) and Zn(II) form red colored complex with Alizarin red S at pH 7.0 which are soluble in triton x-100. Zn(II) and Ni(II) have been determined simultaneously in the concentration range of 0.320-4.55 g/mL and 0.293-4.676 g/mL respectively with satisfactory accuracy and precision. The results of applying H-point standard addition method show that Zn(II) and Ni(II) ions can be determined simultaneously with concentration ratio of 15:1 and 1:16 of Zn(II) to Ni(II). This method is based on the difference in the absorbance of Zn(II) and Ni(II) - ARS complexes at pH 7.0 using different wavelength pairs.

    Keywords

    HPSAM, Zinc, Nickel, Simultaneous determination and triton x-100

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