用高碘酸钾-乙基紫催化光度法测定痕量钒(Ⅴ)

A Study on the Determination of Trace Vanadium by Potassium Periodate and Ethyl Violet Catalytic Spectrophotometry

研究了在邻苯二甲酸-氢氧化钠缓冲体系中,利用钒( )催化高碘酸钾氧化乙基紫的褪色反应,建立了催化光度法测定痕量钒( )的新方法。方法的线性范围为0.2～1.6μg·L-1,检出限为0.2μg·L-1,钒( )的测定RSD为1.86%。Mn2+,Cu2+,Fe2+,Fe3+,Cr3+,Pb2+在50倍,K+,Na+,Ca2+,Mg2+,Cl-,Br-等在100倍以上无明显干扰。可以直接用于各种水源中痕量钒( )的测定。

A new method of determining trace vanadium by catalytic spectrophotometry is established through the fading reaction of potassium periodate oxidation of ethyl violet with vanadium as the catalyst in phthalic acid and sodium hydroxide buffer solution. The linear range of the method is 0.2~1.6 μg·L-1, the detection limit is 0.2 μg·L-1, and the detected RSD of vanadium is 1.86%. There is interference when Mn2+, Cu2+, Fe2+, Fe3+, Cr3+ and Pb2+ are fifty times more than the content of V(Ⅴ). However, there is no obvious interference when K+, Na+, Ca2+, Mg2+, Cl- and Br- are 100 times more than the content of V(Ⅴ).The proposed method is rapid and simple with a high degree of selectivity, so it can be directly applied to the determination of trace V(Ⅴ) in natural water samples with satisfactory results.