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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 for the determination of trace vanadium (Ⅴ) by catalytic spectrophotometry was developed by using vanadium (¢ õ) to catalyze the oxidation of ethyl violet by potassium periodate in phthalic acid-sodium hydroxide buffer system. The linear range of the method was 0.2 ~ 1.6μg · L-1, the detection limit was 0.2μg · L-1, and the RSD of vanadium was 1.86%. Mn2 +, Cu2 +, Fe2 +, Fe3 +, Cr3 +, Pb2 + in 50 times, K +, Na +, Ca2 +, Mg2 +, Cl-, Br- in 100 times more no interference. It can be directly used for determination of trace vanadium () in various water sources.