4,5-二溴邻硝基苯基荧光酮与锌显色反应的研究及应用  

Study on the color reaction of zincⅡ with 4,5-dibromo-2-nitro-phenylfluorone and its application

作　　者：朱理哲[1] 皮祖训[1] 

机构地区：[1]湖南科技大学能源与安全工程学院,湖南湘潭411201

出　　处：《冶金分析》2005年第2期59-61,共3页Metallurgical Analysis

摘　　要：在CTMAB存在下,研究了4,5 二溴邻硝基苯基荧光酮(DBON PF)与锌的显色反应。试验表明,在pH8 0的氨性缓冲溶液中,锌与DBON PF形成1∶2的红色络合物,该络合物的最大吸收波长为595nm,其表观摩尔吸光系数为6 87×104,有色络合物稳定24h以上;25mL溶液中,锌质量在0～10μg范围内符合比尔定律;用锌-DBON PF-CTMAB体系显色测定微量锌,方法灵敏度高,选择性好,测定铁矿样中微量锌,结果满意。In the presence of cetyltrimethylammonium bromide(CTMAB),the color reaction of zinc*' with 4,5-dibromo-2-nitro-phenylfluorone(DBON-PF) is investigated.It shows that a red complex is formed in the ammonia-ammonium choride buffer solution (pH 8.0).The molar ratio of zinc*' to DBON-PF in the complex is 1∶2.The complex has a maximum absorption wavelength at 595 nm.The apparent molar absorptivity is 6.87×10~4 L·mol^(-1)·cm^(-1).The color complex is stable for at least 24 h.Beer's law is obeyed in the range of 0-10 μg/25 mL for zinc*'.The method has advantages of high sensitivity and selectivity.The proposed method has been applied to the determination of trace zinc in iron ore with satisfactory results.

关 键 词：二溴邻硝基苯基荧光酮 显色反应 表观摩尔吸光系数 CTMAB 应用 最大吸收波长 络合物 缓冲溶液 锌(Ⅱ) 比尔定律 显色测定 微量锌 灵敏度 PF 铁 

分 类 号：O657.32[理学—分析化学] O614.121[理学—化学]