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《Environmental Science》 1992-02
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Determination of Trace Amount of Vanadium in Environmental Samples with a Kinetic Spectro-photometric Method.

Wang Jianhua, Zhou Quanfa,Ruan Wenjiu (Department of Chemistry, Yantai Normal College)  
A novel kinetic spectrophotometric method for the determination of trace amount of vanadium was proposed based on the inductive effect of Ⅴ(Ⅳ) on Cr2O2 7--I--starch redox reaction. The optimal conditions for the determination were established as: 8.4×10-5mol L-1I-, pH = 2.1 and the determination shoulp be carried out at a wavelenth of 585nm. The calibration graph was linear for vanadium (Ⅳ) concentration ranging from 0 to 6.6 μg·mL-1 under optimal conditions mentioned above, and the detection limit was determined to be 0.02 μgⅤ(Ⅳ)·mL-(?) The procedure is highly selective for Ⅴ(Ⅳ) since most coexisted foreign ions have no interference on the determination except for Fe3+, Fe2+, Sn2+ and Ti3+. Trace amount of vanadium waste in water and soil was determined and satisfactory were obtained, the recovery was observed to be 95.1-98.3%.
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