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为寻求简便、快捷的水中F-含量的测定方法,文章研究了氟离子溶液与锆的邻氯苯基荧光酮配合物的褪色光度法测定F-含量的条件,以及共存离子的干扰.结果表明,在0.146 mol.L-1HCl介质中,有氯化十六烷基吡啶存在时,锆与邻氯苯基荧光酮形成桔黄色的化合物,最大吸收波长为528 nm,表观摩尔吸光系数ε=4.3×105L.mol-1.cm-1.在25 mL溶液中加入F-量为2~20μg时发生的褪色反应遵守比耳定律.常见离子干扰实验表明,除Fe3+、NO3-、Bi3+干扰较为显著外,多数离子不发生干扰.模拟含氟水溶液测定结果表明,该方法灵敏度高,选择性好,可以得到满意的效果.
In order to find out the simple and quick method for the determination of F- content in water, the conditions for the determination of F- content by fading spectrophotometry of the fluorine-ion solution and the ortho-chlorophenylfluorone complex of zirconium and the interference of the coexisting ions were studied. In the presence of cetylpyridinium chloride in 0.146 mol·L-1 HCl medium, zirconium forms an orange compound with o-chlorophenylfluorone with a maximum absorption wavelength of 528 nm and an apparent molar absorptivity of ε = 4.3 × 105L.mol-1.cm-1. The fading reaction of F-amount of 2 ~ 20μg in 25mL solution obeys Beer’s law. Common interference test shows that except Fe3 +, NO3-, Bi3 + Significantly, most of the ions did not interfere with the results of the simulation of aqueous fluoride solution showed that the method of high sensitivity, good selectivity, can be satisfied with the results.