The monitoring of volatile and semi-volatile compounds could demand extra
laboratory facility, labor, and instrumentations to meet the up-coming State and
Federal requirements. The proposed extraction and determination technique is an
automated solvent less extraction and less expensive ion trap mass spectrometry for
sub part per trillion level detection of less volatile contaminants found in many urban
well systems.
The future monitoring direction recommended by the environmental agencies
requires sub part per trillion concentrations of 1,2,3-trichloropropane (1,2,3- TCP),
1,2-dibromo-3-chloro-propane (DBCP), 1,2-dibromomethane (EDB), which currently
determined by the micro-extraction and an electron capture detector (ECD). The
interference of chlorinated species including trihalomethanes caused improper
identification and quantitation of sub ppt levels of 1,2, 3-TCP, DBCP and EDB by the
conventional gas chromatography detector such as an ECD. Also the purity of the
extracting solvent; hexane was the source of contamination for the trace analysis of
these compounds.
Orange County Water District (OCWD) has developed the modified purge-trap and
ion trap mass spectrometry technique for the analysis of 1,4-dioxane due to the
increased importance of monitoring 1,4-dioxane in the treated wastewater and the
groundwater recharge facilities. The modified purge-trap technique was successfully
applied to extract the additional compounds and ion trap mass spectrometry was
optimized to detect sub part per trillion levels of these compounds and 1,4-dioxane
simultaneously.
The modified purge-trap and ion trap mass spectrometry could be utilized to improve
sensitivity and selectivity of these compounds without any organic solvent involved in
the extraction process. The solvent less and automated purge-trap technique
reduced labor and increased productivity of the sample analysis. Recently, the
established method provided tremendous productivity to monitor less volatile organic
compounds from the reverse osmosis (RO) and micro-membrane effluent of the
secondary treated wastewater, which could not easily determined by the current US Environmental Protection Agency method 524.2 and 504.1. Includes 12 references, tables,.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 390 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 18 |
| Published : | 11/01/2005 |
