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铅的光度法测定中,常采用的较灵敏的方法是双硫腙法,但由于试剂不够稳定,方法选择性差,条件要求较严,而且需用剧毒的氰化钾掩蔽各种干扰元素,因此应用不便.PAR(4-[2-吡啶-偶氮]-间苯二酚)法,虽以联合溶剂萃取分离提高选择性.但仍使用氰化物.作者在文献的基础上,对非离子一阳离子表面活性剂混合液中铅(Ⅱ)和溴邻苯三酚红显色反应的机理进行了研究.本文把在OP乳化剂存在下,澳化十六烷基三甲铵或溴化十六烷基吡啶对铅(Ⅱ)-邻苯三酚红的显色反应的增感效应,应用于微量铅的光度.
Lead photometric method, the more sensitive method is often used dithizone method, but because of the reagent is not stable enough, poor selectivity of the method, the conditions require more stringent, and the need to use highly toxic potassium cyanide to mask a variety of interfering elements, So the application is inconvenient.PAR (4- [2-pyridine-azo] -resorcinol) method, although combined with solvent extraction and separation to improve selectivity, but still use cyanide. On the basis of the literature, A cationic surfactant mixture of lead (Ⅱ) and bromopyrogallol red color reaction mechanism was studied in this paper OP emulsifier in the presence of cetyl trimethyl ammonium bromide or bromide Sensitization Effect of Alkylpyridines on the Color Reaction of Lead (Ⅱ) - Pyrogallol Red and Its Application to Luminosity of Trace Lead.