Electrothermal (graphite furnace) atomic absorption spectrometry (ETAAS), as off-line detector for Sedimen¬tation Field-Flow Fractionation (SedFFF) is exploi¬ted in clay analysis. Quantification limits of the coupled SedFFF-ETAAS technique for the determination of a submicronic kaolin sample, considered a representative model of natural water suspended particulate, are theoretically esta¬blished and experimentally validated with reference to ETAAS Al and Si determination. A complete sample recovery for a 4 µg injected kaolin quantity was obtained by keeping adsorption in the SedFFF apparatus under control. The best experimen¬tal conditions, ensuring sample integrity, were low ionic strength (Na2CO3, 10-5 M), pH = 8 and teflon covered accumulation wall. Several different runs, revealing the various experimental parameters affecting quantitative recovery, are reported and the different physico-chemical processes affecting such recovery are discussed. The advantages and drawbacks of SedFFF-ETAAS coupling are also discussed in comparison with inducti¬vely coupled plasma-mass spectrometry (ICP-MS) techni¬que.
File in questo prodotto:
Non ci sono file associati a questo prodotto.