This powerpoint presentation begins by providing a brief overview of NDMA and other nitrosamines. A current study is presented by covering the following topics: EPSRC-funded, Sept 2007-Sept 2009 (extended to Feb 2010); six water treatment works, five United Kingdom water companies;
lowland, upland, groundwater sources;
chloraminated and chlorinated systems, amine-based coagulants;
source waters with elevated N content and/or organic content;
raw, filtered, disinfected, distributed water samples;
seasonal sampling (four intervals in 2008, one in 2009);
NDMA, NMEA, NDEA, NDPA, NDBA, NPYR, NPIP, NMOR;
method - SPE + GC/MS; source water quality characterization; and, QA/QC comparison analysis by another university lab and by a
certified commercial lab in the United Kingdom. Study summary and ongoing work indicates that:
NDMA and other nitrosamines not detected in the vast majority of samples;
first round of sampling (February 2008) exhibited higher nitrosamine
levels than in subsequent rounds - cause uncertain, not seen again in
February 2009 round; NDBA consistently above the MDL in one of the distribution systems; no consistent relationship between nitrosamine levels and contact time in the distribution network; no observed link between nitrosamine levels and source water characteristics or particular treatment processes;
nitrosamine formation studies to be completed in the lab later this year -
formation by various combinations of disinfectants (NH<sub>4</sub>Cl, HOCl, UV, O<sub>3</sub>)
under different water quality conditions. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 28 |
| Published : | 11/01/2009 |
