Specific Determination of Bromate and Iodate in Ozonized Water by ...

IC P -MS signal / counts
20 00
10 00
0 2.5 5 7 .5
100 00
1 27 : I
50 00
79 : B r
ArK +
-
-
BrO 3
←
Br -
0 2.5 5 7 .5
et al. reported that organoiodide
exists in river water, because the
peaks with exactly the same
retention time were obtained in
both chromatograms of ICP/MS
and UV detector at 254 nm [13].
Therefore, the detection of
these unidentified peaks by a
simultaneous detection using
ICP/MS and UV detector was
examined. No peaks in the
chromatogram of UV at 254 nm
were observed at the retention
times of these unidentified peaks
in the chromatogram of ICP/MS.
Furthermore, the retention
behaviors of the unidentified
peaks were evaluated by adding
ethanol to the mobile phase. The
retention times were drastically
decreased as the concentration of
ethanol increased. Clearly, these
species were retained by their
hydrophobicity, not ionicity. The
elucidation of the unidentified
peaks detected at 79 amu will be
very difficult because of their
lower amounts. The unidentified
peak detected at 127 amu might
be based on inorganic iodine
retention time / min
Fig. 4
Chromatograms of ozonized water (sample E). Peaks: BO 3
(1.87 µg/L), Br (5.73 µg/L),
IO 3
(5.45 µg/L), and I (0.05 µg/L).
Experimental conditions are same as those given in Fig. 1. Unit of the concentrations is µg/L as
species.
←
←
rather than organoiodine but its
chemical structure is not still
determined. These unidentified
peaks might be concerned in the
production mechanism of the
halo-oxyacids by the ozonation.
A further detailed examination
would be necessary to elucidate
these unidentified peaks.
Conclusions
←
A specific determination for
bromate, iodate and other halogen
anions in drinking water by direct
injection using IC with ICP/MS
and the postcolumn derivatization
is presented. Bromate and iodate
in ozonized water were determined
at the µg/L level without any
interference from other anions.
The sensitivity of the ICP/MS
detector for halogens was also
very high similar to that of metals
and greater than that of other
detectors for halogens. The
proposed method will be effective
for the simultaneous determination
of halogen anions.
I - IO 3
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