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以往惯常分析用的氧化锆或锆中铝的分光光度法,系用铜铁试剂-氯仿萃取分离或铜铁试剂沉淀分离除去主体,消除干扰,继之以铝试剂或8-羟基喹啉比色测定铝。但铜铁试剂很不稳定,极易分解变质,降低分离效果,且分解产物亚硝基苯需反复破坏,空白值波动大,影响结果的精密度和准确度。本文提出用N-苯甲酰-N-苯基羟胺(BPHA)-氯仿在硫酸体系中萃取锆、铪及共存的钛、铁等,以铬天青S(CAS)-氯化十四烷基吡啶(TPC)光度法测铝。因BPHA稳定且在水中溶解度小,故萃取后的水相不必破坏有机物,可直接显色,简化了手续,空白值稳定。
Conventional analysis of zirconium oxide or zirconium aluminum spectrophotometry, Department of copper and iron reagent - chloroform extraction or separation of copper and iron reagent precipitation removed the main body, eliminating interference, followed by aluminum reagent or 8-hydroxyquinoline colorimetric Determination of aluminum. But the copper and iron reagent is very unstable, easily decomposed metamorphism, reducing the separation effect, and nitrobenzene decomposition products need to be repeatedly destroyed, the blank value fluctuations, the impact of the precision and accuracy of the results. In this paper, the extraction of zirconium, hafnium and the coexistence of titanium and iron with sulfuric acid using N-benzoyl-N-phenylhydroxylamine (BPHA) Pyridine (TPC) spectrophotometric method of aluminum. Because BPHA is stable and has a low solubility in water, the extracted aqueous phase does not have to destroy organic substances and can directly develop color, simplifying procedures and stabilizing the blank value.