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Monitoring waste in groundwater (without all the waste)
Date:3/7/2011

e itself with the extracted analytes is removed from the well. In this way, monitoring can be conducted without the use of purge water or the liberation of wastewater at the surface.

Once the device has completed its work and is removed from the well, the contaminant-charged media are shipped to the laboratory, where they undergo automated analysis assisted by robotics, as well as standard methods including mass spectrometry and ion chromatography. The new technology boasts extremely low detection limitsin the ng/L to pg/L range. Further, it produces no wastewater and may be carried out at a low cost per sample, thanks to the use of automation.

The IS2 sentinel will be applied on a pilot basis at DoD sites and used in multiple deployments to examine a range of groundwater contaminants, including volatile organic compounds like tetrachloroethene, trichloroethene, and vinyl chloride, water-soluble fuel components (benzene and toluene), explosives (RDX and TNT), semi-volatile compounds (phenol), polycyclic aromatic hydrocarbons (naphthalene and phenanthrene), inorganic water contaminants (perchlorate), and heavy metals (arsenic and lead). Each of these analytes will be captured in situ, using a pair of customized IS2 devices. Results will be compared to those obtained with conventional water monitoring approaches.

The project seeks to demonstrate improved detection limits, 10 to 100-times lower than those achieved through current EPA methods. The accuracy, reproducibility and precision of results should also exceed EPA methods, providing detailed analyses of a broad spectrum of compounds at considerably lower costs. While initial efforts focus on monitoring at DoD hazardous waste sites, ultimately, the technology should find broad applicability for groundwater oversight.


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Contact: Joseph Caspermeyer
Joseph.Caspermeyer@asu.edu
Arizona State University
Source:Eurekalert  

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Monitoring waste in groundwater (without all the waste)
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