United States Department of Transportation
i
Implementation of technology for rapid field detection of sulfate and organic content in soils : technical report.
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2012-06-01
[PDF-3.83 MB]
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Edition:Technical report; Feb. 2011-Dec. 2011.
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Abstract:The protocol using the Veris 3150 for determination of sulfate-rich soils has been implemented to two fullscale
projects in Dallas and Paris Districts. The determination of organic-rich soil was not implemented in this project
due to the unavailability of proper equipment. Researchers collected electrical conductivity (EC) data from two Veris
3150 units equipped at both TxDOT and TTI, simultaneously. Soil samples were collected on the basis of the
constructed EC color map. The data collected from these projects were analyzed to identify potential relationships
between Veris EC measurements and sulfate contents for different types of soil.
Statistical modeling results indicate that Veris EC is a linear function of the natural log of the sulfate content,
directly if other soil parameters such as moisture content, organic matter content, and clay content remain constant.
Higher EC of soil responds to higher sulfate content of soil. It is imperative that soil samples be collected based on the
EC map generated from the Veris 3150 data. Therefore, it is recommended that the Veris EC be used as a viable
screening tool to identify areas where high sulfate-bearing soils may exist.
A color-coded map indicates that the area that has the greater EC shows the higher sulfate content. The
comparison study of TxDOT and TTI Veris units shows that the units produce comparable sets of data although the
actual EC values may not be exactly matched.
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