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研究了用meso-四(4-三甲胺基苯)卟啉与Zn~(2+)生成荧光络合物测定微量锌的荧光光度法。在弱酸性介质中,Zn~(2+)首先与试剂生成络合物,而后在盐酸羟胺存在下加入Cu~(2+)络合剩余的试剂。最后用盐酸酸化,Zn~(2+)的络合物分解,而Cu~(2+)的络合物仍很稳定。测量分解出的H~3P~+荧光,其荧光强度与锌量成正比。方法灵敏度是2ppb。用氟化钠作掩蔽剂,测定了铝标样的锌含量,结果与标准值相符。
The spectrofluorimetric method for the determination of trace zinc with fluorescent complexes of meso-tetrakis (4-trimethylaminophenyl) porphyrin and Zn 2+ was studied. In weakly acidic medium, Zn 2+ first forms a complex with the reagent, and then adds the Cu 2+ complexing reagent remaining in the presence of hydroxylamine hydrochloride. Finally, acidification with hydrochloric acid, Zn ~ (2+) complex decomposition, and Cu ~ (2+) complex is still very stable. The H ~ 3P ~ + fluorescence was decomposed and its fluorescence intensity was proportional to the amount of zinc. The sensitivity of the method is 2 ppb. With sodium fluoride as a masking agent, the zinc content of the aluminum standard was determined and the results were in agreement with the standard values.