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Media type:
E-Book
Title:
Brominated Trihalamines in Chlorinated Seawaters
:
Quantification of Tribromamine and Identification of Bromochloramines by Membrane Introduction Mass Spectrometry
Description:
A Membrane Introduction Mass Spectrometry (MIMS) analytical method was developed to differentiate brominated trihalamines (i.e. tribromamine NBr3, dibromochloramine NBr2Cl and bromodichloramine NBrCl2) in synthetic and natural chlorinated seawater. The MIMS parameters were optimized and the mass spectra of NBr3 was established. A mass-to-charge ratio of m/z = 253 corresponding to the parent compound was chosen for the quantification of NBr3 in absence of organic matter and the fragment signal at m/z = 177 in presence of high concentration of organic matter. The signal recorded at m/z 253 and m/z 177 were compared with NBr3 spectra obtained by UV-Visible measurements to calibrate the MIMS. A good linear response curve was observed from 0.5 to 100 µM for NBr3 with a limit of detection of 0.23 µM (49 µg Cl2/L) for the parent ion m/z 253 and 0.18 µM (38 µg Cl2/L) for the fragment m/z 177. Parent ion compounds at m/z = 207 and m/z =163 were chosen to respectively monitor NBr2Cl and NBrCl2 in seawaters. These two bromochloramines were not quantified by MIMS due to the lack of analytical standards and the difficulty to prepare pure solutions. MIMS results showed that reaction of brominated trihalamines with natural organic matter (NOM) was a minor pathway for 1 – 2 mg C/L compared to their auto-decomposition in natural or synthetic seawater. Overall, MIMS was able to unambiguously differentiate and monitor brominated trihalamines for the first time in chlorinated seawater, which was not possible by using UV measurement, titration and colorimetric methods