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Spectrophotometic Determination of Trace Zinc in Milk Powder by Ethyl Rhodamine B
Corresponding Author(s) : Gang Xu
Asian Journal of Chemistry,
Vol. 26 No. 17 (2014): Vol 26 Issue 17
Abstract
In the presence of the surfactant gum Arabic, the Zn(II)-SCN–-ERB (ERB = ethyl rhodamine-B) ternary chromogenic reaction system was studied. The results showed that, in the acetic acid-sodium acetate medium of pH 5.0, Zn(II)-SCN–-ERB forms a rose red complex of 1:4:2 at room temperature. The complex has a maximum absorption wavelength of 625 nm, a zinc content of 0.16-8.00 μg/25 mL conforming to the Lambert-Beer’s law, a molar absorption coefficient e625 of 1.02 × 105 L mol-1 cm-1 and a detection limit of 0.045 μg/25 mL. Using this method to determine the trace zinc in milk powder, the relative standard deviation is less than 2 % and the results are satisfactory.
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References
Y. Hu, G.Y. Han and J. Wang, Contemporary Med., 17, 152 (2007).
L.B. Song, L.G. Zhao, Y.W. Zhao and H.H. Chen, J. Anhui Agric. Sci., 40, 16374 (2012).
Z.H. Kou, X.M. Ding, Y.Q. Hu and Y.Q. Jia, Occup. Health, 23, 707 (2007).
Z.J. He, X.Z. Dong and W.P. Hu, Chinese J. Anal. Lab., 23, 33 (2004).
Y.N. Xu, Cereals Oils Process., 10, 151 (2010).
L. Zhang, S.C. Zhao, C.Z. Wang and X.Z. Zhang, Chem. Anal., 43, 465 (2007).
Y.B. Wang, Y.J. Chen and G.H. Li, Chinese J. Anal. Lab., 29, 118 (2010).
H.Q. Yang, G.Q. Li and S.T. Han, Food Sci., 28, 278 (2007).