萘相萃取双波长分光光度法测定微量铜的研究

Study on DW-Spectrophotometric Determination of Microamounts Copper with Naphathalene-Phase Extraction

本文用萘作萃取剂，以5－Br－PADAP为显色剂，采用双波长分光光度法测定微量铜的研究。研究表明，选择540／383nm为测定波长时，组合物最大吸收峰为540nm，表观摩尔吸光系数为1．26×105L·mol-1·cm－1，铜量在0－5．0μg／7mL范围内符合比耳定律，方法应用于食品、水样品铜的测定，结果满意。

In this paper,DW-spectrophotometric determination of Copper and by selecting naphathalene asthe soild extraction apent and the extracting complex of 5-Br-PADAP with Cu(Ⅱ ). Measuring wave-length and reference wavelength of 540/383nm. The maximum absorption of the complex is at 540nmand the molar absoprtwtty is 1. 26 × 10 5L· mol-1·cm-1. Beer's. law is obeyed in the concentrationrange Cu (Ⅱ) 0- 5. 0μg/7mL. The proposed method has been appiled to the determination of Cu(Ⅱ) in water and food with satisfactory results.