Studies on the Highly Sensitive Colour Reaction of Tellurium(Ⅳ)-Potassium Iodide-Rhodamine B- Polyvinyl Alcohol System

Abstract

Abstract: On the basis of [TeI₈]^4- anion reacting with Rhodamine Bin the presence of polyvinyl alcohol to form ion-association complex, a highly sensitive spectroph otometric method was developed for determination of tellurium. The optimum medium of the colour reacion is a 0.64~1.28mol/Lphosphoric acid .solution. The complex has the composition [RhB]4[TeI8] established by the equilibrium shift and Job's method of continuous variations. The reation has a very high sensetivity, its molar absorptivity is 1.65×10⁶ L·mol^-1. cm^-1 at 600nm. The selectivity of this method is fairly good and can be applied for the spectrophotometric determination of trace amounts of tellurium in steel, sulfur and some other samples.

Key words: Tellurium determination, Spectrophotometry, Tellurium(Ⅳ)-potassium iodide-Rhodamine B-polyvinyl alcohol system

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Liu Shaopu, Liu Zhongfang . Studies on the Highly Sensitive Colour Reaction of Tellurium(Ⅳ)-Potassium Iodide-Rhodamine B- Polyvinyl Alcohol System[J]. Chem. J. Chinese Universities, 1988, 9(8): 774.

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Studies on the Highly Sensitive Colour Reaction of Tellurium(Ⅳ)-Potassium Iodide-Rhodamine B- Polyvinyl Alcohol System

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