摘要
在聚乙烯醇存在的硫酸介质中，银与过量的I^-形成配阴离子，并进一步与罗丹明B反应形成离子缔合物[AgI2]^-时，共振瑞利散射（RRS）强度明显增强并与银离子含量成正比，其最大RRS波长位于331．5nm处。研究了体系的共振瑞利散射光谱特征、主要影响因素和反应的最佳条件。结果表明，银离子质量浓度在0．06-2．0μg／mL范围内与RRS增强程度呈良好的线性关系（r=0．9973）。方法检出限为0．05仙g／mL，RSD4．78％，样品加标回收率为98．0％-102．0％。该法具有较高的灵敏度，操作简便，用于环境水样中痕量银的测定，结果令人满意。
In the sulfuric acid medium, the RRS was enhanced greatly, when Ag reacted with excessive amount of I- to form [ AgI2 ]- cation comlex which further reacted with RB to form an ion association complex in the presence of PVA, the maximum RRS peak was at 331.5 nm. The optimal conditions for the reactions and the spectral characteristics of the complex were studied. The enhanced RRS intensity （AI） was directly proportional to the concentration of Ag in the range of O. 06 ～ 2.0 μg/mL （r =0. 997 3）. The detection limit was 0.05 μg/mL and RSD is 4.78% , with the recovery of 98.0% ～102.0%. The proposed method has the advantage of high sensitivity, simplicity, and it was applied to the determination of trace amounts of silver in environmental water with satisfactory results. Key words： silver; resonance rayleigh scattering; potassium iodide; rhodamine B
出处
《广东微量元素科学》
CAS
2009年第7期59-62,共4页
Trace Elements Science
关键词
银
共振瑞利散射
碘化钾
罗丹明B
silver
resonance rayleigh scattering
potassium iodide
rhodamine B
