A. Joseph et B. Narayana, Complexometric determination of zinc(II) using 2,2 '-bipyridyl as selective masking agent, MIKROCH ACT, 134(1-2), 2000, pp. 33-35
An indirect complexometric method is described for the determination of zin
c(II) using 2,2'-bipyridyl as masking agent. Zinc(II) in a given sample sol
ution is initially complexed with an excess of EDTA and surplus EDTA is tit
rated with lead nitrate solution at pH 5.0-6.0 (hexamine), using xylenol or
ange as indicator. An excess of 2,2'-bipyridyl is then added, the mixture s
haken well and the EDTA released from the Zn-EDTA complex is titrated with
standard lead nitrate solution. Results are obtained for 3-39 mg of Zn with
relative errors less than or equal to 0.5% and standard deviations +/- 0.0
6 mg. The interference of various ions are studied. The method is applied f
or the determination of zinc in its alloys and ores.