A. Agrawal et al., SPECTROPHOTOMETRIC DETERMINATION OF CE(IV) USING O-PHENYLENEDIAMINE IN STEELS, Bulletin of Materials Science, 17(7), 1994, pp. 1467-1471
A simple and sensitive spectrophotometric method for the determination
of cerium(IV) was developed. With o-phenylenediamine cerium(IV) gives
an orange-red colour with an absorption maximum at 470 nm. The system
obeys Beer's law in the range 7 ppm to 500 ppm with a molar absorptiv
ity of 2.4 x 10(3) l mol(-1) cm(-1) and Sandell sensitivity of 0.5 ppm
. Interference by various ions was studied. This method was used for t
he determination of cerium in low-alloy steels and the results are in
good agreement with the certified values.