Study on Simultaneous Determination of In and Sn with Regress-orthogonal Designs and Oseillopolarography
Zhu Lihua,Zhang Jiazhong,Lu Xiaohua,Shi Wenzhau(Chemistry Department of Huazhong University of Science and Technology, Wuhan)
In a supporting solution of 2.5％oxalic acid with presence of 0.01％ methylene blue, two nonlinear regress models for relationships between oscillopolarographic secondary derivative peak height of In and Sn and their concentrations have been eatablished with orthogonal design-regress analysis,which have been used to simultaneously determine In and Sn in their coexistence systems. Compared with the literature, this method shows a marked advantage of wide range of relative concentration of two compounds, which provides a new method for simultaneous determination of two components in non-over-severe overlapping polarographic system. This method has been used in simultaneous deter-mnination of In and Sn in aluminiurn alloys with recovery or 92.2 to 108.8％.