Al-Ferron逐时络合比色分光光度法分析Al30形态的研究

探讨了运用Al—Ferron逐时络合比色分光光度法进行Al30分析的适用性．与传统ferron比色法属于操作性的定义不同．该方法对Al-Ferron逐时络合比色的时间扫描数据进行非线性拟合，并假定3种动力学可测形态：一种是瞬时完成的0级反应的铝单体：另两种是一级反应的待定形态．以拟舍得到的特征k值和吸光度，作为定性和定量的依据．结果表明：通过优化拟合改进的ferron比色法，可以获得Al30的特征k值，其值在15mLferron比色体系中为7×10-5数量级；Al30用ferron比色法的定量分析结果与^27Al NMR鉴定结果基本一致，可用以定量分析Al30.该方法既可替代昂贵的^27Al NMR鉴定．又能弥补传统ferron比色法定性模糊的不足．

Study on Al30 Speciation by Al-Ferron Complex Timed Colorimetric Method

The feasibility of Al-Ferron complex timed colorimetric method used in speciation of Al30 was probed in this study. Unlike the traditional ferron assay, it can be regarded as operational definition method, three type of species with certain k values were assumed in method of modified ferron assay, the k values and absorbance values through nonlinear simulation for the data obtained from Al-Ferron complex timed scanned can be used to analyze the species in Al-OH solutions. The results prove that the characteristic k value of -7× 10^-6 can be used for identification of the newly found species of Al30. The quantified analysis results of Al30 by ferron assay are consistent with that by ^27Al NMR. The modified ferron assay can substitute for the costly ^27Al NMR, while making up the insufficiencies of uncertainty in Al speciation by traditional ferron assay.