脱脂棉富集分光光度法测定痕量铜

Determination of trace copper by spectrophotometry with absorbent cotton enrichment

摘要: 研究了在表面活性剂Tween 80存在下 ,Cu(Ⅱ ) PAN 碘化物体系显色反应 ,其λmax=5 5 0nm处 ,ε5 5 0 =6 .15× 10 4L·mol- 1 ·cm- 1 ,铜含量在 0～ 14μg/ 2 5mL范围内符合比耳定律为了提高体系的选择性 ,本文提出了用脱脂棉富集铜的方法 ,简便、快速 ,用于江水、河水、人发及茶叶的测定 ,回收率为 91%～ 10 3% ,结果满意

Abstract: The color reaction of Cu (Ⅱ) -I-PAN system is studied in the presence of Tween-80.The apparent molar absoption coeflicient is 6.15×10 4L·mol -1 cm -1 at 550 nm.Beer's law is obeyed for copper in the range of 0～14 μg/25 mL.The method of absorbent cotton enrichment is put forword to improve the selectivity of this system.The method has been succesfully used to determine trace copper in the river,lake,tea and human hair.