275-3 Field Compatible XRF Preparation Techniques for Trace Elemental Analysis of Groundwater and Soil Surveys

Session: Advancing the Understanding and Management of Groundwater Pollution with Arsenic and Other Geogenic Contaminants Using Geospatial Tools, Machine Learning, and Data Science, Part II

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Abstract:

Wavelength dispersive x-ray fluoresence (WDXRF) analysis is a powerful elemental assay tool in environmental groundwater and soil land-survey type assessments. The sample preparation for WDXRF analyses is one single largest sources of error in the testing, directly effecting potential accuacy of results. The need for simplified specimen collection and suitable preservation of these samples in a field setting, while seeking to optimize the trace elemental fidelity for water and soil, adds another layer of challenge to the process. Two newer preparation styles are highlighted here in response to those needs, showing novel innovation to meet these obstacles and yield reliable data. Both preparations are designed to be compatible for analysis in a vacuum atmosphere that is important for lowest achievable detection limits by the WDXRF technique. The first is a micro-droplet "Ultra Carry" absorption prep for groundwaters that allows for preconcentration of liquids at higher volume and lower contribution of filter media to the spectral background. The second method of prep is for ground soils aided by an adhesive mount polymer backed "Sample Board" solidifcation, that again adds little intensity from the prep to the baseline, allowing for greater trace element detection. The data will show these techniques are effective and accurate, verified by concurrent duplicate testing with certified reference materials in SPEX multielement standard solutions and NIST geological powder standards. The most attractive feature of this study and presentation is the simplistic and repeatable approach in the preparation steps that are featured and result in a well made and stable sample ready for vacuum analysis and elminate the error sources that often frustrate analysts and technicians alike.

Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025

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