摘要
在pH 5.0 的NaAc-HAc缓冲溶液中, PVA 存在时, 锡和邻苯二酚紫(PV) 与罗丹明B(RhB) 生成离子缔合物, 其组成为Sn∶PV∶RhB= 1∶2∶4。缔合物最大吸收波长为560 nm , 表观摩尔吸光系数ε=1.18×105 L·m ol- 1 ·cm - 1 。锡量在0~15 μg/25m L范围内符合比耳定律。拟定方法已用于某些样品中微量锡的测定, 结果满意。
In the presence of PVA,a sensitive color reaction of tin(Ⅱ) on pyrocatechol violet and rhodamine B has been studied.In a NaAc HAc(pH=5 0) medium,tin(Ⅱ) ions form an ions associate complex with pyrocatechol violet and rhodamine B.The composition of the complex is Sn(Ⅱ)∶PV∶RhB=1∶2∶4.The maximum absorption of the ions associate complex is at 560 nm with an apparent molar absorptivity of 1 18×10 5 L·mol -1 ·cm -1 .Beer′s law is obeyed in the range of 0—15 μg/25mL of tin.The method is highly selective and has been applied to the determination of trace tin in some objects with satisfactory results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1999年第5期765-767,共3页
Spectroscopy and Spectral Analysis
关键词
锡
邻苯二酚紫
罗丹明B
协同显色
分光光度法
Tin(Ⅱ) determination, Pyrocatechol violet, Rhodamine B, Synergistic color spectrophotometry