The Orange County Water District (OCWD) has monitored eight nitrosamines and
other emerging contaminants within its advanced water treatment plant and
monitoring facilities at sub-parts per trillion levels. To effectively monitor for
these critical targets, OCWD has improved specific analytical methods using
automated solid phase extraction processes. Since the molecular weight, polarity
and chemical stability of these compounds represent a wide range of conditions,
the extraction and concentration of these compounds from the treated wastewater
requires very specific optimization of the solid phase extraction techniques.
Sample flow rate, elution time, drying time, and nitrogen gas flow rate are all key
operational parameters within the extraction process.
The OCWD laboratory has successfully improved the method to determine these
targets at parts per trillion levels for eight specific nitrosamines, including
nitrosomorpholine, which is not listed in U.S. Environmental Protection Agency (USEPA) Method 521, 1,4-dioxane, and
other critical target compounds. This paper presents improved method techniques
and analytical results derived from the automated solid phase extraction process,
using carbon and polymer based sorbents and optimized operating conditions. Includes 11 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 15 |
| Published : | 11/01/2009 |
