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研究了在pH 6 2～ 8 2磷酸二氢钾 磷酸氢二钠缓冲体系中 ,非离子表面活性剂TritonX 10 0存在下 ,铜 (Ⅱ )与二溴羟基苯基荧光酮 (DBH PF)形成 1∶2红色三元混配合物而使荧光熄灭 ,建立了荧光熄灭法测定铜的新方法。配合物的λex=5 3 0nm ,λem=5 60nm ,含量在 0～ 80 μg·L-1范围内有良好的线性关系 ,检测限为 0 2 μg·L-1。体系的灵敏度高 ,选择性好。Al(Ⅲ )、Fe(Ⅲ )、Ti(Ⅳ )的干扰 ,可用氟化钠、苦杏仁酸掩蔽。方法快速简便 ,用于人发、茶叶及水中微量铜的测定与AAS相符 ,RSD(n=5 ) <6 9% ,回收率在 98%～ 10 4 %之间。
The effects of copper (Ⅱ) and dibromohydroxyphenylfluorone (DBH PF) on the formation of 1 (1) in the presence of a nonionic surfactant TritonX 10 0 in a buffer system of potassium dihydrogen phosphate and potassium dihydrogenphosphate at pH 6 2 ~ : 2 red ternary complex fluorescence quenching, the establishment of a new method of fluorescence quenching determination of copper. The complex has a good linear relationship between λex = 5300nm and λem = 560nm, and the detection limit is 0.2μg · L-1 in the range of 0 ~ 80 μg · L-1. High sensitivity system, good selectivity. Al (Ⅲ), Fe (Ⅲ), Ti (Ⅳ) interference, available sodium fluoride, mandelic acid masking. The method is rapid and simple. The determination of trace copper in human hair, tea leaves and water is in accordance with AAS. The RSD (n = 5) <69% and the recovery between 98% ~ 104%.