Specific Determination of Bromate and Iodate in Ozonized Water by ...
Specific Determination of Bromate and Iodate in Ozonized Water by ...
Specific Determination of Bromate and Iodate in Ozonized Water by ...
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IC P -MS signal / counts<br />
20 00<br />
10 00<br />
0 2.5 5 7 .5<br />
100 00<br />
1 27 : I<br />
50 00<br />
79 : B r<br />
ArK +<br />
-<br />
-<br />
BrO 3<br />
←<br />
Br -<br />
0 2.5 5 7 .5<br />
et al. reported that organoiodide<br />
exists <strong>in</strong> river water, because the<br />
peaks with exactly the same<br />
retention time were obta<strong>in</strong>ed <strong>in</strong><br />
both chromatograms <strong>of</strong> ICP/MS<br />
<strong>and</strong> UV detector at 254 nm [13].<br />
Therefore, the detection <strong>of</strong><br />
these unidentified peaks <strong>by</strong> a<br />
simultaneous detection us<strong>in</strong>g<br />
ICP/MS <strong>and</strong> UV detector was<br />
exam<strong>in</strong>ed. No peaks <strong>in</strong> the<br />
chromatogram <strong>of</strong> UV at 254 nm<br />
were observed at the retention<br />
times <strong>of</strong> these unidentified peaks<br />
<strong>in</strong> the chromatogram <strong>of</strong> ICP/MS.<br />
Furthermore, the retention<br />
behaviors <strong>of</strong> the unidentified<br />
peaks were evaluated <strong>by</strong> add<strong>in</strong>g<br />
ethanol to the mobile phase. The<br />
retention times were drastically<br />
decreased as the concentration <strong>of</strong><br />
ethanol <strong>in</strong>creased. Clearly, these<br />
species were reta<strong>in</strong>ed <strong>by</strong> their<br />
hydrophobicity, not ionicity. The<br />
elucidation <strong>of</strong> the unidentified<br />
peaks detected at 79 amu will be<br />
very difficult because <strong>of</strong> their<br />
lower amounts. The unidentified<br />
peak detected at 127 amu might<br />
be based on <strong>in</strong>organic iod<strong>in</strong>e<br />
retention time / m<strong>in</strong><br />
Fig. 4<br />
Chromatograms <strong>of</strong> ozonized water (sample E). Peaks: BO 3<br />
(1.87 µg/L), Br (5.73 µg/L),<br />
IO 3<br />
(5.45 µg/L), <strong>and</strong> I (0.05 µg/L).<br />
Experimental conditions are same as those given <strong>in</strong> Fig. 1. Unit <strong>of</strong> the concentrations is µg/L as<br />
species.<br />
←<br />
←<br />
rather than organoiod<strong>in</strong>e but its<br />
chemical structure is not still<br />
determ<strong>in</strong>ed. These unidentified<br />
peaks might be concerned <strong>in</strong> the<br />
production mechanism <strong>of</strong> the<br />
halo-oxyacids <strong>by</strong> the ozonation.<br />
A further detailed exam<strong>in</strong>ation<br />
would be necessary to elucidate<br />
these unidentified peaks.<br />
Conclusions<br />
←<br />
A specific determ<strong>in</strong>ation for<br />
bromate, iodate <strong>and</strong> other halogen<br />
anions <strong>in</strong> dr<strong>in</strong>k<strong>in</strong>g water <strong>by</strong> direct<br />
<strong>in</strong>jection us<strong>in</strong>g IC with ICP/MS<br />
<strong>and</strong> the postcolumn derivatization<br />
is presented. <strong>Bromate</strong> <strong>and</strong> iodate<br />
<strong>in</strong> ozonized water were determ<strong>in</strong>ed<br />
at the µg/L level without any<br />
<strong>in</strong>terference from other anions.<br />
The sensitivity <strong>of</strong> the ICP/MS<br />
detector for halogens was also<br />
very high similar to that <strong>of</strong> metals<br />
<strong>and</strong> greater than that <strong>of</strong> other<br />
detectors for halogens. The<br />
proposed method will be effective<br />
for the simultaneous determ<strong>in</strong>ation<br />
<strong>of</strong> halogen anions.<br />
I - IO 3<br />
References<br />
1. M. S. Siddiqui, G. L. Amy, <strong>and</strong><br />
R. G. Rice, J. AWWA, 87 (1995)<br />
59.<br />
2. J.C. Kruith<strong>of</strong>, <strong>and</strong> J.C. Schippers,<br />
<strong>Water</strong> Supply, 11 (1992) 121.<br />
3. J. C. Kruith<strong>of</strong> <strong>and</strong> R. T. Meijers,<br />
<strong>Water</strong> Supply, 13 (1995) 93 .<br />
4. J. C. Kruith<strong>of</strong> <strong>and</strong> R. T. Meijers,<br />
<strong>Water</strong> Supply, 13 (1995) 117.<br />
5. WHO, “Guidel<strong>in</strong>es for<br />
Dr<strong>in</strong>k<strong>in</strong>g-water Quality”, 2nd<br />
Ed., vol. 1. Recommendations,<br />
the World Health Organization,<br />
Geneva, 1993.<br />
6. F. Sacher, A. Matschi, <strong>and</strong><br />
H.-J. Brauch, Acta Hydrochim.<br />
Hydrobiol., 23 (1995) 26.<br />
7. R. J. Joyce, <strong>and</strong> H. S. Dhillon,<br />
J. Chromatogr. A, 671 (1994)<br />
165.<br />
8. H. We<strong>in</strong>berg, J. Chromatogr. A,<br />
671 (1994) 141 .<br />
9. Y. Inoue, T. Sakai, H. Kumagai<br />
<strong>and</strong> Y. Hamaoka, Anal. Chim.<br />
Acta, <strong>in</strong> press.<br />
10. V. V. Salov, J. Yosh<strong>in</strong>aga,<br />
Y. Shibata <strong>and</strong> M. Morita, Anal.<br />
Chem., 64 (1992) 2425.<br />
11. K. Takatera <strong>and</strong> T. Watanabe,<br />
Anal. Chem., 65 (1993) 759.<br />
12. D. T. Heitkemper, L. A. Ka<strong>in</strong>e,<br />
D. S. Jackson <strong>and</strong> K. A. Wol<strong>in</strong>k,<br />
J. Chromatogr. A, 671 (1994)<br />
101.<br />
13. K. G. Heumann, L. Rottmann<br />
<strong>and</strong> J. Vogl, J. Anal. At.<br />
Spectrom., 9 (1994) 1351.<br />
14. J. T. Creed, M. L. Magnuson,<br />
J. D. Pfaff <strong>and</strong> C. Brockh<strong>of</strong>f,<br />
J. Chromatogr. A, 753 (1996)<br />
261.<br />
15. K. Ito, E. Shoto <strong>and</strong><br />
H. Sunahara, J. Chromatogr. A,<br />
549 (1991) 265.<br />
16. “St<strong>and</strong>ard Methods for the<br />
Exam<strong>in</strong>ation <strong>of</strong> <strong>Water</strong>”,<br />
Japanese <strong>Water</strong> Supply<br />
Society, (1993) 38.<br />
17. K. G. Heumann, <strong>and</strong><br />
H. Seewald, Fresenius’ Z.<br />
Anal. Chem., 320 (1985) 493.<br />
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