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锡基及铜合金中铁的比色测定,采用硫氰酸盐作显色剂,需要一定的分离手续,费时较长;以硫代硫酸钠掩蔽铜,磺基水杨酸作显色剂直接测定,方法简便,但铈的干扰未能消除;对于铅锡合金中铁的测定采用邻菲咯啉作显色剂,在pH5的介质中以EDTA掩蔽干扰元素,方法也简便,但对铜的掩蔽量较低。我们采用巯基乙酸掩蔽干扰离子,在pH9～10的氨性介质中以邻菲咯啉作显色剂,按照高速分析的形成因素进行铁的比色测定。克服了上述各方法缺陷,获得十分满意的结果。完成一次测定仅需50～70秒钟。如选择适当的溶解液,本法亦适用于铅、铝、锌等合金中铁的测定。
Tin and copper alloy colorimetric determination of the use of thiocyanate as a reagent, the need for some separation procedures, time-consuming; with sodium thiosulfate masking copper, sulfosalicylic acid as a direct determination of reagent , The method is simple, but the interference of cerium can not be eliminated. For the determination of iron in pewter, phenanthroline is used as the chromogenic agent to mask the interfering elements with EDTA in pH5 medium. The method is also simple, Lower. We used thioglycolic acid to mask the interfering ions and used phenanthroline as chromogenic agent in ammoniacal medium with pH9-10 to determine the colorimetric iron according to the formation factor of high-speed analysis. Overcome the shortcomings of the above methods, obtained very satisfied results. It takes only 50 to 70 seconds to complete an assay. If you choose the appropriate solution, this Law is also applicable to the determination of iron in lead, aluminum, zinc and other alloys.