AGFD Lauren Jackson  Wednesday, April 10, 2013 

242 - Distribution of arsenic in soils of the conterminous United States

David B. Smith, dsmith@usgs.gov, William F. Cannon, Laurel G. Woodruff. U.S. Geological Survey, Denver, Colorado 80225, United States

The U.S. Geological Survey recently completed a soil geochemical survey of the conterminous United States. The project was based on sampling of 4,800 sites (1 site per approximately 1,600 km2). At each site a sample from 0 to 5 cm depth was collected along with samples from the soil A and C horizons. Each sample was sieved to <2 mm and then ground to <150 mm prior to chemical analysis for 45 major and trace elements. Arsenic was analyzed by hydride-generation atomic absorption spectrometry following fusion in sodium peroxide and sodium hydroxide. For all three sample types, arsenic varied by approximately three orders of magnitude from less than 0.6 mg/kg to about 1,000 mg/kg, with a median of 5.2 mg/kg for the 0-5-cm and A-horizon soils and 5.7 mg/kg for the C horizon material. Composition of the soil parent material was the primary control on spatial distribution.


Wednesday, April 10, 2013 09:20 AM
Arsenic Contamination of Food and Water (08:30 AM - 12:05 PM)
Location: DoubleTree by Hilton New Orleans
Room: Madewood B

 

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