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DatoValore
TitleIon chromatography determination of trace level bromate by large volume injection with conductivity and spectrophotometric detection after post column derivatisation
AbstractBromate is a well known by-product produced by the ozonisation of drinking water; the allowed concentration for human consumption has to be regulated to the low ?g l-1 range. A direct injection, ion chromatographic method was developed using a tetraborate eluent with serially connected conductivity and spectrophotometric detection. Bromate was detected after post-column reaction with fuchsin at 520 nm. Sample capacity was investigated by injecting large volumes (up to 6 ml) using a high total hardness and chloride tap water. Linear correlation of bromate response with volumes from 1 ml to 6 ml was demonstrated, the main limitation being the overlapping of the chloride peak with bromate. Up to 1.5 ml sample can be injected without any pre-treatment. With more than 1.5 ml injection volume, a sample pre-treatment with a cartridge in Ag and H form, followed by a 10 min degassing in an ultrasonic bath, was needed. This method was validated by analysing secondary reference materials and real samples from a drinking water treatment plant. The method was linear from the limit of quantification to 20 ?g l-1. Reproducibilities in tap water were 18% (5 ?g l-1, n=12) and 21% (1 ?g l-1, n=4) respectively for 1.5 and 6 ml injection volumes with conductivity detection, and 17% at 0.5 ?g l-1 (n=9) with spectrophotometric detection. Calculated detection limits were 0.5 ?g l-1 (6 ml) and 2 ?g l-1 (1.5 ml) for conductivity detection and 0.3 ?g l-1 (1.5 ml) for spectrophotometric detection.
SourceJournal of chromatography (Print) 864, pp. 263–270
KeywordsBromateInorganic anions
JournalJournal of chromatography (Print)
EditorElsevier, Amsterdam, Paesi Bassi
Year1999
TypeArticolo in rivista
AuthorsValsecchi S., Isernia A., Polesello S., Cavalli S.
Text235565 1999 Bromate Inorganic anions Ion chromatography determination of trace level bromate by large volume injection with conductivity and spectrophotometric detection after post column derivatisation Valsecchi S., Isernia A., Polesello S., Cavalli S. 1 IRSA CNR, Brugherio 2 Dionex Italia, Pieve Emanuele Bromate is a well known by product produced by the ozonisation of drinking water; the allowed concentration for human consumption has to be regulated to the low g l 1 range. A direct injection, ion chromatographic method was developed using a tetraborate eluent with serially connected conductivity and spectrophotometric detection. Bromate was detected after post column reaction with fuchsin at 520 nm. Sample capacity was investigated by injecting large volumes up to 6 ml using a high total hardness and chloride tap water. Linear correlation of bromate response with volumes from 1 ml to 6 ml was demonstrated, the main limitation being the overlapping of the chloride peak with bromate. Up to 1.5 ml sample can be injected without any pre treatment. With more than 1.5 ml injection volume, a sample pre treatment with a cartridge in Ag and H form, followed by a 10 min degassing in an ultrasonic bath, was needed. This method was validated by analysing secondary reference materials and real samples from a drinking water treatment plant. The method was linear from the limit of quantification to 20 g l 1. Reproducibilities in tap water were 18% 5 g l 1, n=12 and 21% 1 g l 1, n=4 respectively for 1.5 and 6 ml injection volumes with conductivity detection, and 17% at 0.5 g l 1 n=9 with spectrophotometric detection. Calculated detection limits were 0.5 g l 1 6 ml and 2 g l 1 1.5 ml for conductivity detection and 0.3 g l 1 1.5 ml for spectrophotometric detection. 864 articolo 99ValsecchiJChromBromate.pdf Articolo in rivista Elsevier 0021 9673 Journal of chromatography Print Journal of chromatography Print J. chromatogr. Print Journal of chromatography. Print Journal of chromatography. A Print stefano.polesello POLESELLO STEFANO saramaria.valsecchi VALSECCHI SARA MARIA