DETERMINATION OF WATER AND ACID-SOLUBLE COMPONENTS IN ATMOSPHERIC DUST BY INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY, ION CHROMATOGRAPHY AND ION-SELECTIVE ELECTRODE METHOD

The extraction and determination of water and dilute-acid-soluble comp onents in atmospheric dust has been investigated as a part of its syst ematic chemical state analysis. A sample aias dispersed in acetone by ultrasonication, followed by centrifugation. After the supernatant was removed for the analysis of acetone-soluble components, succeeding ex tractions with water and dilute hydrochloric acid were carried out for the residue. The water-soluble components were extracted within 20 mi n under ultrasonication. Dilute hydrochloric acid was added to the res idue after water extraction, and the soluble components were extracted by filtration and ultrasonication. Extraction with 0.1 M hydrochloric acid was recommended, because it dissolved the main soluble component s, such as sulfate and carbonate (e.g., gypsum and calcite) within 20 min without any significant loss of iron oxides (e.g., magnetite and h ematite), which could be determined by X-ray diffraction analysis. Six teen cations, ammonium ion and five anions in the extracts were determ ined by inductively coupled plasma atomic emission spectrometry using a yttrium internal standard, an ion-selective electrode and ion chroma tography, respectively. The determination of water and dilute-acid sol uble components in atmospheric dust collected in bagfilters was achiev ed with reasonable precisions.