Poster Number 36
Wednesday, 8 October 2008
George R. Brown Convention Center, Exhibit Hall E
The use of field portable x-ray fluorescence spectrometry was evaluated as a quantification tool for gypsum content in soils of West Texas and Eastern New Mexico, USA. Six sites were evaluated with gypsum contents ranging from <10% to >90%. Samples collected from each site were scanned in the field using XRF, then brought back to the lab for additional XRF scanning. Variables which might affect XRF scanning results, such as scanning time, particle size, moisture content, etc. were evaluated. Both gypsum (CaSO42H2O) and calcite (CaCO3) were quantified using standard lab techniques. Correlation of gypsum XRF data (via Ca quantification minus CaCO3 content) and lab data showed a strong correlation. Field portable XRF shows considerable promise as a rapid, quantifiable measure of gypsum in soils.