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在 pH5 .9的邻苯二甲酸氢钾 氢氧化钠缓冲体系中 ,在CTMAB的存在下 ,Fe(Ⅲ )和Al(Ⅲ )与BTAMoPACA形成最大吸收分别为 6 70nm和 6 90nm的有色络合物 ,吸收光谱严重重叠 .采用双波长标准加入法对该混合显色体系进行研究 ,建立铁、铝同时测定的新方法 ,应用于硅砖中痕量铁、铝的同时测定获得满意结果
Fe (Ⅲ) and Al (Ⅲ) with BTAMoPACA in the presence of CTMAB formed a color complex with maximum absorption of 670nm and 690nm, respectively, in pH5.9 potassium hydrogenphosphate and sodium hydroxide buffer system , And the absorption spectra overlap seriously.The new method of simultaneous determination of iron and aluminum was established by using dual wavelength standard addition method.The results of simultaneous determination of trace amounts of iron and aluminum in silica bricks showed satisfactory results