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.Driscoll, JN and GA Cutter, �Total and Speciated Arsenic Compounds in Water by Photoionization and Gas Chromatography/PID�in 'Toxic Trace Metal Remobilization & Remediation - A Geochemical Body of Work' to be published by the ACS (2012)

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

245th National Meeting (2013)

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