R. Toniolo et al., SIMULTANEOUS MICRODETERMINATION OF CHLORINE, BROMINE AND PHOSPHORUS IN ORGANIC-COMPOUNDS BY ION CHROMATOGRAPHY, Journal of chromatography, 662(1), 1994, pp. 185-190
A procedure far the simultaneous microdetermination of chlorine, bromi
ne and phosphorus in organic compounds is described. It consists of io
n chromatographic analysis, after suitable dilution, of the solution r
esulting from the collection in water containing hydrogen peroxide of
the combustion products obtained by decomposition of the sample in a S
choniger hash. Before analysis, this solution undergoes a post-combust
ion procedure involving further hydrolysis of the combustion products
which allows a nearly quantitative recovery of phosphorus to be achiev
ed even in the presence of other heteroatoms such as chlorine and brom
ine. This post-combustion step avoids negative errors in the microdete
rmination of phosphorus by ion chromatography owing to the minor but n
ot insignificant amounts of both pyrophosphate and a cyclic metaphosph
ate which are formed together with the predominant orthophosphate in t
he conventional Schoniger combustion of organophosphorus compounds. Th
e accuracy and precision of the overall procedure were evaluated.