我们曾用氰化钾隐蔽大量的铁,三乙醇胺隐蔽少量的铝,直接用 EDTA 络合滴定法测定钡恒磁中的钡,从而代替了经典的硫酸钡重量法,使分析手续大为简便快速。但氰化钾有剧毒,经常使用会影响分析人员健康,我们考虑单用三乙醇胺隐蔽铁和铝。根据文献报导,我们采用先加入过量 EDTA 于微酸性 We used to conceal a large amount of iron with potassium cyanide, triethanolamine to conceal a small amount of aluminum, direct determination of barium in barium constant with EDTA complexometric titration, thus replacing the classic barium sulfate gravimetric method, the analysis procedure is simple and quick . However, potassium cyanide is highly toxic and frequently used to affect the health of analysts. We consider the use of triethanolamine alone to conceal iron and aluminum. According to the literature, we used to add excess EDTA in slightly acidic