SPECTROPHOTOMETRIC DETERMINATION OF COBALT(II), NICKEL(II) AND COPPER (II) WITH 1-(2 PYRIDYLAZO)-2-NAPHTHOL IN MICELLAR MEDIUM

Authors

  • G. A. Shar Department of Chemistry, Shah Abdul Latif University Khairpur, Sindh, Pakistan.
  • G. A. Soomro Department of Chemistry, Shah Abdul Latif University Khairpur, Sindh, Pakistan.

DOI:

https://doi.org/10.71330/thenucleus.2004.1068

Abstract

Spectrophotometeric determination of cobalt(II), nickel(II) and copper(II) is carried out with 1-(2 pyridylazo)-2-naphthol as a complexing reagent in aqueous phase using non-ionic surfactant Tween 80. Beer’s law is obeyed for Co(II), Ni(II) and Cu(II) over the range 0.5 - 4.0, 0.5 - 4.0 and 0.5 - 3.0 ngmL-1 with detection limit (2σ) of 6.7, 3.2 and 3.9 ngmL-1. The ï¬max molar absorption, molar absorptivity, Sandell's sensitivity of Co(II), Ni(II) and Cu(II) are 580 nm, 570 nm and 555 nm; ï¥ max ï‚´ (104 mol-1 cm -1) is 0.87, 1.8 and 1.6 and 6.8, 3.3 and 3.9 ng cm-2 respectively. The pH at which complex is formed for Co(II), Ni(II) and Cu(II) is 5, 5.5 and 6.5 respectively. The critical micelle concentration (CMC) of Tween 80 is 5%. The present method is compared with that of atomic absorption spectroscopy and no significant difference is noted between the two methods at 95% confidence level. The method has been applied to the determination of Co(II), Ni(II) and Cu(II) in industrial waste water and pharmaceutical samples

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Published

10-07-2020

How to Cite

[1]
G. A. Shar and G. A. Soomro, “SPECTROPHOTOMETRIC DETERMINATION OF COBALT(II), NICKEL(II) AND COPPER (II) WITH 1-(2 PYRIDYLAZO)-2-NAPHTHOL IN MICELLAR MEDIUM”, The Nucleus, vol. 41, no. 1-4, pp. 77–82, Jul. 2020.

Issue

Vol. 41 No. 1-4 (2004)

Section

Articles

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