黄钠铁矾渣及其浸取液中铁的测定

黄钠铁矾渣中铜的含量较高,用重铬酸钾容量法来测定其中的铁时,干扰铁的测定,需预分离才能准确测量。但在用铁还原法浸取黄钠铁矾渣后的浸出液中,由于部分铜被除去,铜的含量降低,不干扰铁的测定,无须预分离,直接测定。试验结果表明,当铜的含量占铁量的4%时,干扰铁的测定。

Assay of iron in iron vitriol dreg of yellow sodium and its extract

The content of copper in iron vitriol dreg of yellow sodium is relatively high,so it interferes with the determination of iron in dreg by means of potassium dichromate method.In order to get a accurate result ,we must separate it in advance.But in the extract coming from the process of soaking by iron reducing,because some copper has been removed and its content became small,so it need not to separate in advance and we can measure iron directly.The result of the experiment show that when the content of copper is 4% of iron,it interferes with the determination of iron.