Integration of Solid-phase Extraction with Electrothermal Atomic Absorption Spectrometry for Determination of Trace Elements

抄録

An enrichment step in a sample treatment is essential for trace analysis to improve the sensitivity and to eliminate the matrix of the sample. Solid-phase extraction (SPE) is one of the widely used enrichment technique. Electrothermal atomic absorption spectrometry (ETAAS) is a well-established determination technique for trace elements. The integration of SPE with ETAAS leads to further improvement of sensitivity, an automation of the measurement and the economy in the sample size, amounts of the reagents and time for the sample pretreatment. The integration is achieved by introducing the solid phase used for the enrichment directly into ETAAS for a batch method, or on-line coupling of a SPE column with ETAAS. Fine particles of various materials, including an activated carbon, an ion-exchange resin, a cellulose nitrate resin and biomass materials were used as adsorbents for batch method. A membrane filter was also used. A simultaneous multi-elements extraction and a speciation analysis were accomplished. A microcolumn packed with resin beads or an open tubular column such as a PTFE tube or a silica capillary tube having the chemically modified inner wall were used for the on-line coupling.