Investigation into Alternative Sample Preparation Techniques for the Determination of Heavy Metals in Stationary Source Emission Samples Collected on Quartz FiltersReportar como inadecuado




Investigation into Alternative Sample Preparation Techniques for the Determination of Heavy Metals in Stationary Source Emission Samples Collected on Quartz Filters - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Analytical Science Division, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK





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Abstract Monitoring stationary source emissions for heavy metals generally requires the use of quartz filters to collect samples because of the high temperature and high moisture sampling environment. The documentary standard method sample preparation technique in Europe, EN 14385, uses digestion in hydrofluoric acid and nitric acid HF-HNO3 followed by complexing with boric acid H3BO3 prior to analysis. However, the use of this method presents a number of problems, including significant instrumental drift during analysis caused by the matrix components, often leading to instrument breakdown and downtime for repairs, as well as posing significant health and safety risks. The aim of this work was to develop an alternative sample preparation technique for emissions samples on quartz filters. The alternative techniques considered were: i acid digestion in a fluoroboric acid HBF4 and HNO3 mixture and ii acid extraction in an aqua regia AR mixture HCl and HNO3. Assessment of the effectiveness of these options included determination of interferences and signal drift, as well as validating the different methods by measurement of matrix certified reference materials CRMs, and comparing the results obtained from real test samples and sample blanks to determine limits of detection. The results showed that the HBF4-HNO3 mixture provides the most viable alternative to the documentary standard preparation technique. View Full-Text

Keywords: stationary source emissions; heavy metals; quartz filters; hydrofluoric acid; fluoroboric acid; aqua regia stationary source emissions; heavy metals; quartz filters; hydrofluoric acid; fluoroboric acid; aqua regia





Autor: Sharon L. Goddard * and Richard J. C. Brown

Fuente: http://mdpi.com/



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