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1968年,Rao等人提出了在浓磷酸介质中用亚铁还原六价钼,再用重络酸钾氧化电位滴定钼的新方法。这个方法与其他测钼的氧化还原容量法比较,具有还原简单、干扰较少和准确度高等优点。这个方法的基本原理是:磷酸与三价铁的络合物比磷酸与亚铁的络合物稳定得多;而磷酸与五价钼的络合物却比磷酸与六价钼的络合物稳定得多。于是,随着磷酸浓度的增加,亚铁的还原性越来越强,而六价钼的氧化性越来越强。在13克分子浓度的
In 1968, Rao et al. Proposed a new method for the titration of molybdenum with potassium peroxydisulfate by reduction of hexavalent molybdenum with ferrous iron in concentrated phosphoric acid medium. Compared with other methods for measuring the redox capacity of molybdenum, this method has the advantages of simple reduction, less interference and high accuracy. The basic principle of this method is that the complex of phosphoric acid and ferric iron is much more stable than the complex of phosphoric acid and ferrous iron, while the complex of phosphoric acid and pentavalent molybdenum is more stable than the complex of phosphoric acid and hexavalent molybdenum Much more stable Thus, with the increase of phosphoric acid concentration, the reduction of ferrous iron is more and more strong, and the oxidation of hexavalent molybdenum is getting stronger and stronger. At 13 mcg