一类荧光酮试剂的析相体系研究Ⅱ．水杨基荧光酮析相光度法测定铜

Studies on the Phase Separation System ofa Series of Fluorone ReagentsⅡ.The PhaseSeparation Spectrophotometric Determinationof Trace Copper by Salioylfluorone

本文研究了铜－水杨基荧光酮（ＳＡＦ）－ＴｒｉｔｏｎＸ－１００析相显色体系，建立了测定铜的析相光度法。在ｐＨ８．５Ｈ＿３ＢＯ＿３－ＮａＯＨ介质中，铜－水杨基荧光酮（ＳＡＦ）－ＴｒｉｔｏｎＸ－１００胶束溶液在９５℃加热１ｈ，配合物即被ＴｒｉｔｏｎＸ－１００相完全富集，最大吸收峰为５５６ｎｍ，铜含量在０～１０μｇ／５ｍＬ符合比耳定律。方法以氟化钾、酒石酸钠、柠檬酸钠为掩蔽剂，应用于铝合金中铜的测定，结果满意。

The optimum conditions for the phaseseparation colouring reaction of copper-sali-cylfluorone with Triton X-100 has been stud-iedanda method for the determination oftrace copper hasbeen proposed.In pH 8.5H_2BO_3-NaOH buffer medium,the complex canbe eniriched in Triton X-100 phase when heat-ed at 95℃ for lh in a boiling water bath. Themaximum absorption of the cornplex lies at55 6nm, Beer's law is obeyed for copper con-centration in the range of 0 to 10μg/5mL. Theproposed method has been applied to the di-rect determination of trace copper in aluminumalloy samples with satisfactory results.