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用苯芴酮作显色剂的胶束增溶光度法,已应用于锗、钼、锡的测定,但用类似的方法测镓,似尚未报导。本文研究了溴化十六烷基吡啶(简称CPB)-苯芴酮与镓(Ⅱ)的显色条件,提出了以苯芴酮作显色剂、CPB 作胶束增溶剂的高灵敏度的测镓方法。在 pH6.2～6.7,镓-苯芴酮-CPB 形成三元络合物,其最大吸收波长为580毫微米,在此波长下,络合物的克分子吸光系数为1.02×10~(?)。在25毫升水相中,镓浓度在0～10微克范围内遵守比尔定律。观察了乙酸丁酯萃取镓时42种共存离子的萃取行为和对显色的影响,采用1,10-二氮菲和柠檬酸盐作掩蔽剂,可有效地提高方法的选择性。本法应用于矿石中微量镓的测定,结果较满意。
Micellar solubilization spectrophotometry using benzofluorenone as a developer has been used for the determination of germanium, molybdenum and tin, but gallium has not yet been reported in a similar manner. In this paper, the conditions for the color development of cetylpyridinium bromide (referred to as CPB) -benzofluorenone and gallium (Ⅱ) were studied. High sensitivity detection methods using benzofluorenone as chromogenic agent and CPB as micelle solubilizer Gallium method. At pH 6.2 ~ 6.7, gallium-benzene-fluorenone-CPB forms a ternary complex with a maximum absorption wavelength of 580 nm. At this wavelength, the molar absorptivity of the complex is 1.02 × 10 ~ ). Beer’s law is obeyed in the 25 ml aqueous phase at a gallium concentration of 0 to 10 μg. The extraction behavior of 42 kinds of coexisting ions during the extraction of gallium acetate with butyl acetate and the effect on the color development were observed. The selectivity of the method was improved by using 1,10-phenanthroline and citrate as masking agents. This method is applied to the determination of trace gallium in ore, the result is satisfactory.