浅谈检验Fe2+与Fe3+的误区

Misconception in Testing Fe2+ and Fe3+

空白试验证明，用浓度大于1mol／L的盐酸溶液做Fe3＋的提取液，或用过浓盐酸溶液酸化试液，盐酸中的Fe3＋都会给检验试液中的Fe3＋带来干扰；检验食品中的铁元素时，若铁是以Fe抖形式存在，如果加入硝酸将其氧化为Fe3＋，硝酸中Fe3＋会对检验试液中的Fe3＋带来干扰。

Blank test proved that concentration greater than 1 mol/L HC1 solution as extrac- tion liquid of Fe3＋ , or concentrated hydrochloric acid solution as acidified solution, the Fe3＋ in hy- drochloric acid would bring interference to test Fe3＋in the test solution. When checking the iron element in food, if the iron was in the form of Fe2＋, if adding hydrogen nitrate to oxidize Fe2＋ to Fe3＋ , Fe3＋ in hydrogen nitrate would bring interference to test Fe3＋ in the test solution.