| Autor: |
Draper WM; Sanitation and Radiation Laboratory Branch, California Department of Health Services, Berkeley 94704, USA., Dhoot JS, Remoy JW, Perera SK |
| Jazyk: |
angličtina |
| Zdroj: |
The Analyst [Analyst] 2000 Aug; Vol. 125 (8), pp. 1403-8. |
| DOI: |
10.1039/b002345k |
| Abstrakt: |
The volatile and polar solvent 1,4-dioxane has recently been reported as a contaminant of ground and surface waters, establishing the need to determine this substance in drinking water. This investigation established that 1,4-dioxane can be determined in water by various techniques including direct aqueous injection (DAI) gas chromatography (GC) and purge and trap GC-mass spectrometry (MS). Purge and trap GC-MS is limited by 1,4-dioxane's poor purge efficiency, resulting in detection limits up to 100 times greater than the efficiently purged volatile organic compounds. To attain the sensitivity required for drinking water monitoring, a method based on continuous liquid-liquid extraction with dichloromethane was developed. Isotope dilution was more accurate and reproducible than quantification with external standards, and the improvement in precision led to a lower method detection limit, 0.2 microgram L-1, using a quadrupole ion trap instrument in the electron ionization mode. Isotope dilution accuracy approached 100% in ppb determinations. Isotopic dilution quantification was also possible using a non-selective GC detector owing to the high efficiency of capillary GC columns that resolve the deuterium-labeled solvent from the natural isotopes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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