Groundwater occurrence
of ethylene thiourea (ETU) was investigated in conjunction with the National Pesticide Survey (NPS)
conducted by the US Environmental Protection Agency (EPA) in 1989 using EPA
Method 509. Based on occurrence data collected for this contaminant, EPA
estimated that ETU would likely be found in as many as 8,470 (0.1 %) of
domestic wells.
Studies conducted since the NPS have shown an increased incidence of tumors
in rats and mice exposed to ETU leading to its classification as a Group B2,
probable human carcinogen. These findings gave rise to new interest in
collecting additional occurrence data for ETU using a method with higher
sensitivity. The EPA is considering including ETU in a survey that will be
conducted under the Unregulated Contaminant Monitoring Rule in 2006. A revision of the method allowed EPA the opportunity to incorporate changes
that would improve safety, reduce cost, and make the method easier to perform
in the laboratory. The use of a large volume injection (LVI) will reduce the size of
the water sample and the amount of extraction reagents used. Two drawbacks
of LVI are that injection port conditions must be carefully optimized and that
impurities from glassware and extraction reagents, which may not be significant
at low-volume injection, become problematic. Includes 8 references, tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 230 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 4 |
| Published : | 11/02/2003 |
