Bromate assay in water by inductively coupled plasma mass spectrometry combined with solid-phase extraction cartridges |
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Authors: | Email author" target="_blank">Qiantao?CaiEmail author Zhong-Xian?Guo Chunhai?Yu Wei?Zhang Zhaoguang?Yang |
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Institution: | (1) Centre for Advanced Water Technology, Block 2, Unit 241, Innovation Centre (NTU), 18 Nanyang Drive, Singapore 637723, Singapore |
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Abstract: | Based on selective sorption of bromide, bromoacetic acids (BAA) and bromomethanes on solid-phase extraction (SPE) cartridges, a sensitive and convenient method was developed for the determination of bromate in waters by inductively coupled plasma mass spectrometry (ICP–MS). Dionex OnGuard Ag and reversed-phase (RP) cartridges were tested for retention characteristics for bromide, BAA and bromomethanes. When a sample acidified with nitric acid was passed through an RP cartridge, BAA and bromomethanes were retained, afterwards bromide was absorbed as a precipitate of silver bromide and bromate was unretained when the nearly neutral sample passed a combination of Ag and H cartridges. After SPE pretreatment the recovery of bromate was 96–106%, and bromide remaining in the aqueous phase was found to be less than 0.06 g L–1 when the original bromide concentrations were less than 5 mg L–1. Effectiveness of stacked Ag and H cartridges in removing bromide from chloride-containing samples was also examined. Common cations and other anions did not interfere with bromate determination. The detection limit for bromate is 57 ng L–1. This method has been applied to analyse waters from various sources, and the recovery of the spiked bromate was in the range of 92–107%. |
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Keywords: | Bromate ICP– MS Solid-phase extraction Water analysis |
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