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Research Indicates Low Bias for SW-846 Method 3060A for Extraction of Hexavalent Chromium from Soil
Monday, 05 December 2011 14:21
In this work, the performance of the most common extraction procedure (EPA Method 3060A) using NaOH–Na2CO3 solutions was evaluated using X-ray absorption near edge structure spectroscopy (XANES), which enables the quantification of Cr(VI) directly in the solid state. Results obtained with both methods were compared for three solid samples with different matrices: a soil containing chromite ore processing residue (COPR), a loamy soil, and a paint sludge. Results showed that Cr(VI) contents determined by the two methods differ significantly, and that the Method 3060A procedure underestimated the Cr(VI) content in all studied samples. The underestimation is particularly pronounced for COPR. The low extraction recovery for EPA Method 3060A was found to be the main reason. http://pubs.acs.org/doi/abs/10.1021/es201002g

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avatar Joe B
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While this study shows the low bias of Method 3060A for Cr+6 in soils when compared to XANES, it is worth mentioning that the 3060A method requires simultaneous heating and stirring to achieve maximum recoveries with this method. This is often difficult to do with large amounts of samples. In order to help laboratory production, look at our StirBase and HotBlock technology specifically designed for the 3060A method. Using our 50mL sized HotBlocks it is possible to extract up to 54 samples at a time.
Tuesday 06 December 2011, 03:27
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