Tuesday, March 26, 2013

Sensitive photoionization (PID) method for the measurement of ppb levels of inorganic arsenic in well water

This research paper is part of the Arsenic Contamination in Food and Water symposium Agricultural & Food Chemistry Poster Session which precedes the two day oral symposium at #ACSNOLA.    

166 - Sensitive photoionization (PID) method for the measurement of ppb
 levels of inorganic arsenic in well water

Jack Driscoll1, Jennifer Maclachlan1Janet B. Foley2,
 Tim B Schroeder2(1) PID Analyzers, LLC, Sandwich, MA 02563, United States, 
(2) Bennington College, Bennington, VT 05210, United States

Bennington College is located in southwestern Vermont, an area that has recorded many
 bedrock wells with arsenic levels near and above the 10 ppb limit. We are interested in 
exploring the geochemical conditions and redox chemistry that contributes to the 
solubilization of As(III), the more toxic form of arsenic. We plan to set up some model 
systems in the lab as well as test conditions with samples of local bedrock. We would have 
chosen the older colorimetric method rather than the AA or ICP-MS because the cost of
 these types of spectrometers is outside our price range. We decided to try the hydride
 generation (HG)-PID method for arsenic in water analysis at ppb levels (1) because it is
 more sensitive and more accurate than the colorimetric method and the system cost is a
 fraction of the $200K spectrometer price. We will compare some of our HG-PID results 
with ICP-MS to confirm the accuracy of these tests.[ol][li]Driscoll, JN and GA Cutter, 
“Total and Speciated Arsenic Compounds in Water by Photoionization and Gas 
Link to product literature

Chromatography/PID”in "Toxic Trace Metal Remobilization & Remediation -
 A Geochemical Body of Work" to be published by the ACS (2012)[/li][/ol]

Tuesday, April 9, 2013 02:00 PM
General Posters (02:00 PM - 04:00 PM)
Location: Morial Convention Center
Room: Hall D

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