K. Kovacshadady et I. Fabian, DETERMINATION OF VITAMIN-C IN EFFERVESCENT TABLETS CONTAINING OTHER VITAMINS TOGETHER WITH TRACE-ELEMENTS, Journal of pharmaceutical and biomedical analysis, 14(11), 1996, pp. 1479-1486
A simple, rapid method is reported for the determination of vitamin C
in effervescent tablets containing other vitamins and several trace el
ements such as Mg(II), Zn(II), Fe(II), Mn(II), Cu(II) and Mo(VI). The
procedure was developed on the basis of the bromate ion-iodide ion-asc
orbic acid clock reaction (Landolt reaction). interference effects of
air oxygen and metal ions and the role of pH are discussed in detail.