邻菲啰啉直接光度法测定水中总铁

为了准确快速测定印染企业生产用水中的铁，探讨了Fe3＋在水浴和室温25℃时的还原反应试验，发现在这2个条件下Fe3＋均能被盐酸烃胺快速还原为Fe3＋，进而提出了测定水中总铁的新方法——邻菲哕啉直接光度法。并对该方法的检出限、显色络合物的稳定性、干扰及消除、盐酸用量、校准曲线、精密度和准确度进行了试验。检出限为0．03mg／L，显色络合物显色15min可稳定6个月，精密度RSD〈4．32％，加标回收率为95．3％～103％。通过地下水、地表水、工业废水和铁标准样品的比对实验表明，邻菲哕啉直接光度法与邻菲啰啉光度法（标准法）的测定结果无显著差异。

Determination of Total Fe in Water by the o-phenanthroline Direct Spectrophotometry

Examination of Fe3＋ reductive reaction in water and 25℃ was tested for determining Fe in dyeing waste water. The results showed that Fe3＋ reduced to Fe3＋ fleetly by hydrochloride hydrocarbon amine. The method of detection limit, stability of color reaction complex, interference, hydrochloride dosage, standard curve, precision and validity were tested. Detection limit was 0.03 mg/L, color reaction complex produced color in 15rain and lasted 6 months. RSD was less than 4.32%, recycling rate was 95.3% - 103%. Compared with ground water, surface water, waste water and Fe standard example, there was no obvious difference between the o- phenanthroline direct spectrophotometry method and standard method.