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2,3,7—三羟基—9—取代萤光酮类显色剂已用于若干元素的分光光度法测定,但其和铅(Ⅱ)显色反应的研究迄今尚未见报道.我们注意到:在pH=10～11的氨性介质中,铅(Ⅱ)—苯基萤光酮(PF)—溴化十六烷基三甲铵(CTMAB)和铅(Ⅱ)—二溴苯基萤光酮—CTMAB两个体系都有较高的灵敏度,前者在波长576nm处具有最大吸收,摩尔吸光系数ε=7.25×10_4,是除卟啉类显色剂测定铅外最灵敏的方法之一.该法已用于纯金属镍等中微量铅的测定,获得满意的结果.
The 2,3,7-trihydroxy-9-substituted fluorone ketones have been used for the spectrophotometric determination of several elements, but the studies on the color reaction with lead (II) have not been reported yet. (Ⅱ) -Phenylfluorofluoride (PF) -hexadecyltrimethylammonium bromide (CTMAB) and lead (Ⅱ) -dibromophenyl fluorescence in aqueous ammonia solution with pH = Ketone-CTMAB system has a higher sensitivity, the former has the maximum absorption at a wavelength of 576nm, the molar absorptivity ε = 7.25 × 10_4, in addition to the determination of lead porphyrin reagent one of the most sensitive method of the France has been used for determination of trace amounts of lead in pure nickel and other metals, with satisfactory results.