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研究了偶氮氯膦mK(CPA-mK)与铍在水溶液及乙醇-水溶液中的荧光反应,并发展了一种测定痕量铍的新荧光光度法.在上述两种介质中,荧光螯合物的最大激发波长和最大发射波长几乎不变,分别为570.9nm,620.8nm,但后者的荧光强度为前者的3倍以上.反应适宜的pH范围分别为4.0—9.0(水溶液)和5.9—7.2(乙醇-水溶液).测定了螯合物的组成并研究了共存离子的影响及干扰的消除,方法具有较高的灵敏度和较好的选择性,可用于环境水样和铜合金中痕量铍的测定.
Fluorescence reaction of chlorophosphonazo mK (CPA-mK) with beryllium in aqueous solution and ethanol-water solution was studied and a new fluorescence spectrophotometry was developed for the determination of trace beryllium. In both media, fluorescence chelation The maximal excitation wavelength and the maximum emission wavelength were almost the same, 570.9nm and 620.8nm, respectively, but the fluorescence intensity of the latter was more than three times of that of the former.The suitable pH range of the reaction was 4.0-9.0 (aqueous solution) and 5.9- 7.2 (ethanol-water solution). The composition of the chelate was determined and the influence of coexisting ions and the elimination of interference were studied. The method has high sensitivity and good selectivity and can be used for the determination of traces Determination of beryllium.