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Determination of Tin in Copper Alloy by Derivatization and First-derivative Spectrometry

SHAO Yang;XUAN Fang;XU Jian;ZHANG Cui-ling;School of Environmental Science,Nanjing Xiaozhuang University;  
The coloring reaction between novel compound 4-hydroxy-3-( hydroxyimino) butan-2-ylidene-benzohydrazide( DMPH) and tin was studied. A determination method of tin in copper alloy by derivatization and firstderivative spectrometry was established. The experiment showed that,in hydrochloric acid solution,and in the presence of surfactant cetylpyridinium chloride( CPC),the tin could form yellow complex with DMPH. The maximum absorption was at 420 nm,with the apparent molal absorptivity at 2. 78 × 104 L · mol- 1·cm- 1,the linear range within 0. 5—5 μg / m L,and the detection limit at 0. 1 μg / m L. The method was applied to the determination of tin in certified reference material of tin brass. The results were consistent with the certified values. The relative standard deviations( RSD) were 1. 6% —2. 7%,and the recovery rate were 98. 6% —104. 1%.
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