Abstract:
The method of determination of platinum, explained in this communication, is based upon the oxidation of platinum (II) to platinum (IV) in 10N H2SO4 and the following equation explains the reaction : Pt2+ + 2Co3+ -4.> Pt+ 2Co2+ . Hydrochloric acid (1-4N), perchloric acid (1-10%), acetic acid (50% to glacial) and sulphuric acid (1-15 N) were tried to find out suitable media for quantitative oxidation of platinum (rI) to platinum (IV) but ION 11,304 turned out to be the best. The oxidation of platinum (II) to platinum (IV) was quantitative in this medium and the potential jump at equivalence point was quite reasonable. With the increasing amounts of platinum being taken, the potential leap showed an increasing trend but after a certain limit it started decreasing to the extent that with further increase in the platinum taken the oxidation did not proceed quantitative, i.e. there did not appear any potential jump at the equivalence point. but for the amount as reported, the oxidation was quantitative. The time taken to complete one titration went on increasing with the increasing amounts of platinum but within the limits exhibited the reaction proceeded at a reasonable rate and results of analytical importance were available. According to the method reported platinum can be determined within the limits from 25.34 ug to 760.01 ug with a maximum standard deviation of 0.13%.
Page(s):
254-255
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 20, Issue: 4--5, Year: 1977