SPECTROPHOTOMETRIC DETERMINATION OF COBALT(II), NICKEL(II) AND COPPER (II) WITH 1-(2 PYRIDYLAZO)-2-NAPHTHOL IN MICELLAR MEDIUM
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) ï€ 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 samplesReferences
P. Richter, M.I, Toral, A.E. Tapia, and E. Fuenzalida, Talanta, 122, (1997) 1045.
F.W. Sunderman, J. Am. Clin. Pathol. ,35, (1961) 2039.
V.J. Hammond and W.C.Price, J. Opt. Soc. Am., 43 (1972) 924.
W. J. Simmons, Anal. Chem., 45 (1973) 1947.
Chem. Eng. News 54, No. 6 (1976) 6.
Chem. Eng. News 54, No. 6 (1976) 7.
M. P. San Andres, M. L. Marina, and S. Vera, Talanta, 41, (1994) 179.
M. A Sanz and M. F. Fernandez., Anal. Chem., 58 (1986) 2161.
H. C. Gin. L. Hong and P. J. Mai., Talanta 41, (1994) 1357.
A.L. Garcia, E.B. Gonzalez, J.L.G. Alonso and A. Sanz Medel. Anal. Chim. Acta, 264, (1992) 241.
T. Okada, Anal. Chem., 64 (1992) 2138.
E. Paramauro, A.B. Prevot and E. Pelizzetti, Anal. Chim. Acta., 264 (1992) 303.
L.J.C. Love, J.G. Habarta and J.G. Dorsey, Anal. Chem., 56 (1984) 1133.
X. Jin, M. Zhu, E. D. Conte, Anal. Chem., 71 (1999) 514.
J. Yun and H. Choi, Talanta, 52, (2000) 893.
A.K. Malik, K.N. Kaul, B.S. Lark, W. Faubel and A.L.J. Rao, Turk. J. Chem., 25, (2001) 99.
J. Yun and H. Choi, Talanta, 52, (2000) 893.
G.A. Shar and M.I. Bhanger, J. Chem. Soc. Pak., 24, No. 3 (2002) 176.
R.G. Anderson and G. Nickless, Analyst, 92, (1967) 207.
S. Shibata, in Chelates in Analytical Chemistry, Vol. IV, Ed. H. A. Flachka and A. J. Barnard, Jr. Dekker, New York (1972).
H. Watanabe, Talanta, 21 (1974) 295.
S.F. Jiang, Fenxi Huaxue, 8 (1980) 530.
D.D Perrin and B. Dempsey, Buffers for pH and Metal Ion Control, Chapman and Hall, London (1974).
P. Beeher and M. J. Schiek (Ed.) Surfactant Science Series, Vol. 1, Marcel and Dekker, New York, (1966) p. 481.
S. Shibata in Chelates in Analytical Chemistry, Vol. IV, Ed. H. A. Flachka and A. J. Barnard, Jr. Marcel and Dekker, New York (1972).