8-羟基喹啉萃取双波长分光光度法测定铬铁矿中铝、铁已有报导。由于8-羟基喹啉与铝形成不溶性的络合物,故不能在水相中直接显色测定。Katsumi Goto等介绍应用铁试剂(7-碘-8-羟基喹啉-5-磺酸,即Ferron)可省略萃取步骤。徐辉远也阐述由于磺酸基的存在,增大了络合物的溶解度,但所形成络合物的络合比及稳定性受到溶液酸度及其它 Determination of aluminum and iron in chromite by 8-hydroxyquinoline extraction by dual-wavelength spectrophotometry. Since 8-hydroxyquinoline forms an insoluble complex with aluminum, it can not be directly measured in the aqueous phase. Katsumi Goto et al introduced the use of iron reagent (7-iodo-8-hydroxyquinoline-5-sulfonic acid, Ferron) can omit the extraction step. Xu Huiyuan also stated that due to the presence of sulfonic acid groups, the solubility of the complex is increased, but the complexation ratio and stability of the complex formed are affected by the acidity of the solution and other