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Evaluation of hexavalent chromium extraction method EPA method 3060A for soils using XANES spectroscopy
Julien Malherbe1, Marie-Pierre Isaure, Fabienne Séby
1Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, Hélioparc Pau-Pyrénées, 2, avenue Pierre Angot, 64053 Pau Cedex 9, France. malherbe.julien@hotmail.fr
Hexavalent chromium (Cr(VI)) extraction methods often underestimate soil contamination. X-ray absorption near edge structure spectroscopy (XANES) reveals EPA Method 3060A significantly underestimates Cr(VI) in various matrices, especially COPR.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Soil Science
Background:
- Hexavalent chromium (Cr(VI)) in soils requires extraction for quantification.
- EPA Method 3060A is a common extraction procedure.
- Accurate Cr(VI) determination is crucial for environmental risk assessment.
Purpose of the Study:
- To evaluate the performance of EPA Method 3060A for Cr(VI) extraction.
- To compare EPA Method 3060A results with direct solid-state Cr(VI) quantification.
- To investigate Cr(VI) underestimation in different soil matrices.
Main Methods:
- X-ray absorption near edge structure spectroscopy (XANES) for direct solid-state Cr(VI) analysis.
- EPA Method 3060A (NaOH-Na(2)CO(3) extraction).
- Analysis of soil, chromite ore processing residue (COPR), and paint sludge samples.
Main Results:
- EPA Method 3060A significantly underestimated Cr(VI) content across all tested samples.
- Cr(VI) underestimation was most pronounced in COPR samples.
- Low extraction yield was identified as the primary cause for underestimation by EPA Method 3060A.
- Cr(VI) in COPR was found to be associated with magnetic phases.
Conclusions:
- EPA Method 3060A is not fully effective for quantifying Cr(VI) in diverse environmental matrices.
- XANES provides a more accurate assessment of solid-state Cr(VI) concentrations.
- Further research is needed to improve Cr(VI) extraction efficiency for contaminated soils.
