Abstract
The extraction and determination of water and dilute-acid-soluble components in atmospheric dust has been investigated as a part of its systematic chemical state analysis. A sample was dispersed in acetone by ultrasonication, followed by centrifugation. After the supernatant was removed for the analysis of acetone-soluble components, succeeding extractions with water and dilute hydrochloric acid were carried out for the residue. The water-soluble components were extracted within 20 min under ultrasonication. Dilute hydrochloric acid was added to the residue 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 components, such as sulfate and carbonate (e.g., gypsum and calcite) within 20 min without any significant loss of iron oxides (e.g., magnetite and hematite), which could be determined by X-ray diffraction analysis. Sixteen cations, ammonium ion and five anions in the extracts were determined by inductively coupled plasma atomic emission spectrometry using a yttrium internal standard, an ion-selective electrode and ion chromatography, respectively. The determination of water and dilute-acid soluble components in atmospheric dust collected in bagfilters was achieved with reasonable precisions.
