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DETERMINATION OF BROMATE IN THE PRESENCE OF BROMINATED HALOACETIC ACIDS BY ION CHROMATOGRAPHY WITH INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRIC DETECTION
Citation:
Creed, J., M. Magnuson, AND C. Schwegel. DETERMINATION OF BROMATE IN THE PRESENCE OF BROMINATED HALOACETIC ACIDS BY ION CHROMATOGRAPHY WITH INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRIC DETECTION. Environmental Science and Technology 31(7):2059-2063, (1997).
Description:
Bromate is a disinfection by product (DBP) in drinking water that is formed during the ozonation of a source water containing bromide. Brominated haloacetic acids are DBPs that are anions at near -neutral phs. The anion character of bromoacetic acid (pKa=2.7) is similar to bromate, which causes the two species to coelute when NaOH is used as an eluent. Four columns are evaluated as a means of removing the potential false positives generated by bromacetic acid. The alkyl quaternary amine based PA-100 guard column separates bromate from bromoacetic acid using 100 mM NaOH, but the analysis time is greater than 12 min. The use of 5 mM HNO3 as an eluent (with the PA-100) provides adequate separation of bromate from bromoacetic acid with an analysis time of less than 8 min. The stability of bromate in 5 mM HNO3 was evaluated using a DD1 matrix (ph adjusted to 5.5, fortified with bromide) and a drinking water matrix (pH4-9). The bromate recoveries in these two matrices were 93-105% with less than 4% RSDs. Tribronomacetic acid produces a broad peak that envelops the retention window of bromate. The tribromoacetic acid was removed using a reverse-phase sample pretreatment cartridge. The overall analysis procedure was evaluated in a synthetic chloride, sulfate, and nitrate matrix.In addition, precision and recovery data were collected from five ozonated drinking waters. The percent recoveries in the ozonated waters ranged from 90 to 98% with RSDs of less than 6%. The method limit for bromate is 0.8/ug/L.