Comparison of Three Methods for the Extraction of Selected Anions from Media Used for the Collection of Airborne Particulates

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Abstract
Three methods commonly employed for the extraction of sulfate and nitrate from atmospheric particulates collected on filter media were compared with respect to extraction efficiency and reproducibility. Methodologies employed included ultrasonic, boiling water and a three step, warm solution extraction. The technique's performance was examined by extraction of spiked media and standard reference papers. Based on a consideration of reproducibility, extraction efficiency and media homogeneity, the Teflon media/boiling water extraction combination appeared to be superior to the others tested.