碳糊电极循环伏安法测定γ－和β－二氧化锰物相

Determination of Gamma-MnO_2 and Beta-MnO_2 by Cyclic Voltammetry on a Carbon Paste Electrode

利用碳糊电极循环伏安法对γ－ＭｎＯ＿２和β－ＭｎＯ＿２进行了定量分析，相对于２００．０ｍｇ碳粉的线性范围分别为γ－ＭｎＯ＿２９．１３～４５，６ｍｇ；β－ＭｎＯ＿２４．５６～３６．５ｍｇ，在线性范围内测量７次，其ＲＳＤ分别为０．５９％～５．２８％和Ｏ％～５．７２％。同时对γ－ＭｎＯ＿２和β－ＭｎＯ＿２的混合试样及湘潭电解二氧化锰也进行了定量测定，其平均相对误差分别为２．０１％～１２．４％和１．９６％～７．５２％。该方法进行物相分析，具有简便、快速、灵敏、经济和不经化学分离等特点。

amma-and beta-MnO_2 were detemined by the method.The peak current value is directlyproportional to the concentration of the substance studied in the carbon paste electrode. Thelinear ranges of substances with respect to 200mg carbon were found to be 9.13～45.6mg gamma-MnO_2 and 4.56～36.5 mg beta-MnO_2.The RSDs(n=7)were 0.59%～5.28%and0.0%～5.72%respectively.The averge relative errors for the determination of the gamma-andbeta-MnO_2 mixtures and the Xiangtan gamma-MnO_2 were found to be 2.01%～12.4%and1.96%～7.52%respectively.