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为了减少环境污染,广大分析工作者在研究无汞测铁的方法方面作了大量的工作,文献已有报道和评述。单纯用二氯化锡还原无汞测铁的研究,至今仍有某些问题没有得到克服。碘酸钾-硫酸银法成本高,甲基橙和硅钼黄等法结果波动大。本文提出在1.2—3.0mol/L盐酸介质中用钼酸钠氧化二氯化锡。试验结果表明,1毫克铜,0.5毫克钒、砷,大量氟、铬不干扰测定。该法是目前单纯用二氯化锡还原无汞测铁的较好方法。与三氯化钛—钨酸钠法相比,具有手续简便等优点,方法用于标样分析对照,获满意结果。试剂配制钼酸钠(碘)溶液称取3克钼酸钠溶于50毫升
In order to reduce environmental pollution, a large number of analysts have done a great deal of work on methods of mercury-free determination of iron, and the literature has been reported and reviewed. Pure tin dichloride reduction of mercury-free iron research, there are still some problems have not been overcome. Potassium iodate - silver sulfate high cost, methyl orange and silicon molybdenum yellow method results fluctuate. This paper proposes to oxidize tin dichloride with sodium molybdate in a 1.2-3.0 mol / L hydrochloric acid medium. Test results show that 1 mg copper, 0.5 mg vanadium, arsenic, a large amount of fluorine, chromium does not interfere with the determination. This method is currently a simple method of reducing mercury with mercury dichloride. Compared with titanium trichloride - sodium tungstate method, with the advantages of simple procedures, the method for standard sample control, satisfactory results. Reagent preparation Sodium molybdate (iodine) solution Weigh 3 g sodium molybdate dissolved in 50 ml