Drinking water chromatographic peaking

Figure 5.4 Chromatographs of naproxen and its intermediates in drinking water after chlorination at a molar ratio of naproxenxhlorine of 0.03 1 (i.e., 10 mg naproxen 100mg ClaL ) at pH 6.23 (23°C). Naproxen (peak 1) is transformed in intermediates 2, 3, and 4 within 6 min. By one day, naproxen is gone and completely transformed into intermediates 7 (mainly) and 3. (From Boyd et al., 2005.)...

To analyse the solvent extracts a lOpL aliquot of the concentrated extract was injected into a Finnigan 4000 gas chromatograph-mass spectrometer coupled to a 6110 data system. A 3% OV-17 provided the best separation of the detectable PAHs. Quantitative estimations of the detectable O-PAHs in Ottawa drinking water were obtained by comparison of the areas of the two characteristic ion peaks (Tablesl6.2 and 16.3) in the mass chromatograms of the reference standard and the field sample, respectively. No corrections were made for incomplete recovery. Of the 50 PAHs in the standard used by Benoit et al. [119], 38 are detected in at least one of the drinking water samples tested. 

These or user generated databases are the hbraries in which the initial identification of the chromatographic peaks is carried out In our work into pesticides in drinking and ground water for example we generated our own AMDIS Hbrary containing specifically the pesticides and their metaboHtes that we were working on (http //www.spectroscopyeurope.com/td col.html). 

The resulting Br3 /a-CD complex is subject to UV detection at 265 nm. Using this system, the concentration of bromate in a bottled water sample was determined at 6ngl and the calibration had a linear-regression coefficient of 0.996. A similar method was also used to determine trace amounts of separated iodate and nitrite ions in drinking water. Iodate and nitrite in their individual chromatographic peaks form iodine when HI is introduced, after which iodine reacts with excess 1 to form 13 , which in turn forms an inclusion complex with CD. In this process (7-10), CD shifts the equilibrium in (9) to the right, the total concentration of triiodide ion is increased, and therefore, the sensitivity of detection is improved. 

---