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本文合成了水溶性meso-四(4-甲基-3-磺酸苯基)卟啉试剂[简称T(4-MP)PS_4]以光度法研究了该试剂在水溶液中的酸碱平衡和不同酸度下的存在形式,测得其pK_(a1)、pK_(a2)分别为4.80、6.10,并以光度法研究了同一样品中分别测定痕量锌、铜的方法和条件.实验表明,在pH4.10时,该试剂与锌、铜可以同时显色,显色后加入一定量HCl,能使锌配合物分解,而铜配合物不分解,从而消除了锌对铜测定的干扰;当锌含量大大超过铜含量时,铜对锌的测定不干扰.本文探讨了同一试剂分别测定同一实物中锌、铜含量的方法.方法灵敏度高.锌、铜配合物的摩尔吸光系数分别为3.10×10~5、2.10×10~5L·mo1~(-1)·cm~(-1)。本方法用于食品中痕量锌、铜的测定,所得的结果令人满意.
In this paper, the water-soluble meso-tetrakis (4-methyl-3-sulfonate phenyl) porphyrin reagent [referred to as T (4-MP) PS_4] was used to study the acid-base balance and the difference of this reagent in aqueous solution Acidity and pK_ (a1) and pK_ (a2) were 4.80 and 6.10, respectively, and the methods and conditions for the determination of trace amounts of zinc and copper in the same sample were also studied by spectrophotometry.The experimental results show that under the condition of pH4 .10, the reagent and zinc, copper can be developed at the same time, after adding a certain amount of color HCl, zinc complexes can decompose, and the copper complexes do not decompose, thus eliminating the interference of zinc determination of copper; when the zinc content Greatly exceeds the copper content, the determination of copper does not interfere with the zinc.This paper discusses the same reagent were measured in the same kind of zinc, copper content method.Methods High sensitivity.The molar absorption coefficient of zinc, copper complexes were 3.10 × 10 ~ 5, 2.10 × 10 -5 L · mol -1 -1 · cm -1. The method is applied to the determination of trace zinc and copper in food and the result is satisfactory.