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光度法测定铝合金、铜合金中的铁,一般应用邻菲罗啉、磺基水杨酸及硫氰酸铵,但均须将试样中的铜及干扰元素进行分离或掩蔽后才能测定。据文献介绍,在弱酸性溶液中铁(Ⅲ)与二安替比林甲烷能立即形成很稳定的红色络合物,最大吸收在440～460毫微米处。我们在这方面做了显色酸度及部分共存离子影响的试验,结果表明:溶液酸度在pH2.2～3.2之间吸光度最大且稳定(至少一个月不变)。在测定条件下,显色溶液中(括号内数字为毫克数),铜(Ⅱ)、铝(Ⅲ)、镁(Ⅱ)、锰(Ⅱ)、锌(Ⅱ)、镉(Ⅱ)、铅(Ⅱ)(分别为100),镍(Ⅱ)(50),铬(Ⅲ)(3),钴(Ⅱ)(12),铍(Ⅱ)(25),铈(Ⅲ)(10),锆(Ⅳ)(O.5),钖(Ⅳ)(0.1),
Spectrophotometric determination of aluminum alloy, copper alloy of iron, the general application of phenanthroline, sulfosalicylic acid and ammonium thiocyanate, but must be in the sample of copper and interference elements can be separated or masked after the determination. According to the literature, iron (III) and diamtepillin methane form a very stable red complex in weakly acidic solution with maximum absorption at 440-460 nm. In this aspect, we have done experiments on the effect of chromogenic acidity and some co-existing ions. The results show that the acidity of the solution is the largest and stable at pH 2.2 ~ 3.2 (constant for at least one month). Under the conditions of the measurement, the coloration of the solution in the colorimetric solution (the numbers in the brackets are in milligrams), the amounts of copper (II), aluminum (III), magnesium (II), manganese (II), zinc (II), cadmium (100), nickel (Ⅱ) (50), chromium (Ⅲ), cobalt (Ⅱ), beryllium (25), cerium (Ⅲ) Ⅳ) (O.5), 钖 (Ⅳ) (0.1),