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在足够的钠离子存在下,用过氧化氢将Na_2S_2O_3氧化成硫酸钠,再在硝酸溶液中将铁氧化成三价铁,加硫氰酸铵进行比色测定。此法的优点是不必分离硫,操作简便。本法与用硝酸和硫酸分解硫代硫酸钠,再分离硫后测定铁的方法,多次对比测定误差不大。测定步骤:称取25克(±0.001)硫代硫酸钠,于300毫升烧杯中,加水80～100毫升,加热溶解,移入
In the presence of sufficient sodium ions, hydrogen peroxide is used to oxidize Na_2S_2O_3 to sodium sulfate, and the iron is oxidized to ferric iron in nitric acid solution, and ammonium thiocyanate is added for colorimetric determination. This method has the advantage of not having to separate sulfur, easy to operate. This Law and the use of nitric acid and sulfuric acid decomposition of sodium thiosulfate, and then separation of sulfur after the determination of iron method, the error was not determined by many comparison. Determination steps: Weigh 25 g (± 0.001) sodium thiosulfate, in a 300 ml beaker, add water 80 ~ 100 ml, heated to dissolve, into