5′-硝基水杨基荧光酮双波长标准加入分光光度法同时测定锗和钼

SIMULTANEOUS DETERMINATION OF GERMANIUM AND MOLYBDENUM IN MIXTURES BY COMPLEXATION WITH 5′ NITROSALICYFLUORONE AND DUAL WAVELENGTH STANDARD ADDITION SPECTROPHOTOMETRY

在０．３～０．９ｍｏｌ／Ｌ硫酸介质中，在溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下，５′－硝基水杨基荧光酮（５′－ＮＳＦ）与锗（Ⅳ）和钼（Ⅵ）形成最大吸收波长分别为５１３和５３３ｎｍ的红色配合物，其吸收光谱严重重叠。基于此，本文采用双波长标准加入法对该混合物的显色体系进行研究，建立了同时分光光度测定锗和钼的新方法，并与等吸收双波长法作了比较。

In the presence of hexadecyltrimethylammonium bromide and in a medium of 0 3～0 9mol/L sulfuric acid,germanium(Ⅳ) and molybdenum(Ⅵ) react with 2,6,7 trihydroxy 9(2′ hydroxy 5′ nitro)phenylfluorone 3,i e ,5′ nitrosalicyfluorone,to develop red complexes,respectively.The spectra of the two complexes overlap seriously each other,and the additivity of their absorbances is good in the wavelength range of 490～548nm.So a new method for simultaneous spectrophotometric determination of germanium and molybdenum by dual wavelegth standard addition method has been investigated in detail.The analytical results of five standard mixtures are more accuracy than those obtained by isobestic point dual wavelength method.The method has been applied to the analysis of traditional chinese medicine and mineral water with satisfactory results.