摘要
本文研究了新显色剂氯酚偶氮若丹宁与 Ag( )的显色反应。在 p H 4 .3的酸性介质中 ,有适量的表面活性剂吐温 - 4 0存在下 ,Ag( )与试剂生成橙红色配合物 ,最大吸收峰位于 5 30 nm处 ,表观摩尔吸光系数为 1.12× 10 5L· mol- 1 · cm- 1 。该反应灵敏度高 ,选择性较好 ,加入 EDTA作掩蔽剂 ,可消除 Al3+ 、Bi3+、Pb2 +、Fe3+和 Cu2 +等离子的干扰 ,本方法应用于铅锌矿中 Ag( )测定 。
A highly sensitive and selective procedure for the spectrophotometric determination of silver(Ⅰ) has been developed. In 1 mol/L HCl medium, silver(Ⅰ) forms an orange red complex with 5 chloro 2 hydroxybenzenazorhodanine (Cl HBAR),which has an absorption maximum at 530nm.The molar absorptivity is 1.12×10 5 L·mol -1 ·cm -1 . This method has high sensitivity and selectivity.It has been applied to the determination of silver(Ⅰ) in ore samples with satisfactory results.
出处
《光谱实验室》
CAS
CSCD
2002年第6期810-812,共3页
Chinese Journal of Spectroscopy Laboratory
