正交回归偏导数光度法同时测定茶叶中的铝和铁

Simultaneous Determination of Aluminium and Iron in Tea Samples by Regress-Orthogonal Partial Derivative Spectrophotometry

在铬天青S(CAS)—亚硝基R盐—CTMAB混合显色体系中 ,利用还原剂Vc对铁和CTMAB对铝的吸光度的显著影响 ,应用正交回归设计的偏导数光度法 ,同时测定了茶叶和茶水中的铁和铝的含量。误差不大于 4 .6 %。

In this paper, through the effect of V c on Fe 3+ and of CTMAB on Al 3+ , aluminium and iron in the tea samples are simultaneously determined by regress orthogonal partial derivative spectrophotometry in mixed colorant of Chrome azurol S and Nitroso R salt. Analytical error is less than 4.6 %.