AGFD Lauren Jackson  Wednesday, April 10, 2013 

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

David B. Smith,, 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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