摘要
建立了用二甲酚橙作为显色剂直接测定痕量锡的新方法 ,锡与二甲酚橙在pH 3 5时形成的络合物 ,加入聚乙烯醇使稳定性大大提高 ,实验条件下显色络合物的最大吸收峰位于 5 4 4nm处 ,表观摩尔吸光系数ε =4 38× 10 5,线性范围为Sn 0 1～ 5 μg· (2 5mL) - 1 ,回收率为 97 4 %～ 10 1 1%。此方法选择性好、灵敏度高、操作简单 ,此方法用于分析水样中的微量锡 ,结果令人满意。
A new spectrophotometric method for the determination of trace amount of tin(Ⅳ) has been developed based on the reaction of Sn(Ⅳ) with o-cresolphthalexon(XO), which forms a stable complex in the presence of polyvinyl alcohol(PVA). The complex exhibited a maximum absorbence at 544 nm. The molar absorption coefficient was 4.38×105 L·mol -1·cm -1.Recovery factor ranged from 97.4%-101.1%.Beers law was obeyed in the range of Sn 0.1- 5 μg·(25 mL) -1. The complex was stable within 6 h. The suitable conditions for the reaction were investigated. The developed method has been applied to the determination of Sn(Ⅳ) in water samples. The result obtained is statifactory.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2003年第3期594-596,共3页
Spectroscopy and Spectral Analysis
