摘要
在溴化十六烷基三甲基铵(CTMAB)存在下,Sn(Ⅳ) 同甘露醇和邻苯三酚红在pH 0.8时形成紫红色的四元配合物,配合物的组成为: n(Sn(Ⅳ))∶n(甘露醇)∶n(邻苯三酚红)∶n(CTMAB)=1∶1∶2∶1,配合物的最大吸收波长为535 nm,Sn(Ⅳ)在0~3.0 μg/mL范围内符合比耳定律,摩尔吸光系数为3.0×10^5 L·mol^-1·cm^-1.体系不需要分离可直接用于铜合金中微量锡的测定.
In the presence of CTMAB Sn( Ⅳ ) can form red complex with mannite and pyrogallol red (PR) at pH 0.8, and the composition of Sn( Ⅳ)/mannite/PR/CTMAB is 1 : 1:2: 1. The complex exhibits maximum absorption at 535 nm, Beer's law is obeyed for 0- 75 μg/25 mL of Sn( Ⅳ ), and the molar absorptivity is 3.0 ×10^5 L·mol^-1·cm^-1 The system can be applied to the determination of Sn in copper alloy without previous separation.
出处
《分析试验室》
CAS
CSCD
北大核心
2007年第5期109-111,共3页
Chinese Journal of Analysis Laboratory
关键词
锡
邻苯三酚红
分光光度
铜合金
Stannum( Ⅳ )
PR
Spectrophotometry
Copper alloy