Current location: JICS Archive > Vol. 5 > No. 4 > Articles : 2

H-point Standard Addition Method for Simultaneous Determination of Cobalt(II) and Zinc(II) Ions

H.R. Pouretedal* and M. Asefi

Chemistry Department, Malek-Ashtar University of Technology, Shahin-Shahr, I. R. Iran

The H-point standard addition method (HPSAM) was applied to the simultaneous determination of zinc(II) and cobalt(II). This method is based on the difference in the absorbance of methylthymol blue complexes of Zn(II) and Co(II) at pH 6 buffered solution in different wavelength pairs. The results showed that Zn(II) and Co(II) can be determined simultaneously with concentration ratios of 20:1 and 1:7.5. Under working conditions, the proposed method was successfully applied to the simultaneous determination of zinc and cobalt in synthetic and real samples.

Keywords: H-point standard addition, Zinc, Cobalt, Methylthymol blue