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Analysing metals in organic amendments with portable x-ray fluorescence

AuthorsAjmal, Fátima; Burgos, Pilar ; Rosa Arranz, José M. de la ; López Núñez, Rafael
Heavy metal
Issue Date23-Jun-2019
PublisherInternational Union of Soil Sciences
CitationISMOM 2019 - 8th International Symposium on Interactions of Soil Minerals with Organic Components and Microorganisms: (Abstract number: T 2.6), 23-28 june, Sevilla (Spain)
AbstractPortable X-ray fluorescence instruments (PXRF) can be used for non-destructive and very fast determination of metals in soils and sediments. Nevertheless the use of this technique for quantitative determination of metal contents of compost biochar and other organic amendments is limited due to several constraints one of them being sample heterogeneity. The applicability of PXRF in relation to pseudototal contents (determined by acid digestion/ICP or analogous method) and the influence of sample positioning on the measurement window were assessed. Two different samples one compost and one sewage sludge sample dried and finely ground were measured several times in different positions on the measurement window using two different PXRF calibration methods (Soil and Mining). The samples were placed in XRF containers capped with propylene film. The Relative Standard Deviation (RSD standard deviation x 100/ element average) was used as indicative of sample repeatability. In the sludge sample the measurements of Fe Ca Sr Cl Zn Ti Cu S Pb Zr K showed high repeatability (low RSD) among replicate runs in the same position. Despite the sample was finely ground the elements Fe Sc Sr Zn Zr P Si Ca Cu Mn and Cl showed significant differences among the different positions of the container. Additionally to these elements K Ti and Cr also varied among positions in the case of the compost sample. Results for Fe Mn Pb Cr and Sr obtained by the PXRF-Soil method agreed to the pseudototal contents while Cd and Ni contents were lower than their corresponding PXRF detection limits. These results suggest that there is a great potential for widespread evaluation and quantification of elemental concentrations in organic samples and that considering the speed of analysis of the instrument (90-120 s per scan) the evaluation of heterogeneous materials by repeated measurements is feasible
Appears in Collections:(IRNAS) Comunicaciones congresos
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