Electrothermal atomic absorption spectrometry Atomic absorption spectrometry 8 Flow injection 8 Absorption spectroscopy 6 Extraction 6 Silica 6 Atoms 4 Chlorine compounds 4 Chromium compounds 4 Cr(III) 4 Cr(VI) 4 Hybrid mesoporous silica 4 Mesoporous materials 4 Mesoporous silica MCM-41 4 Phase separation 4 Potable water 4 Resins 4 Solid-phase extraction 4 Trace analysis 4 article 4 atomic absorption spectrometry 4 autoanalysis 4 flow injection analysis 4 3-aminopropyltriethoxysilane 2 Absorption 2 Adsorption 2 Adsorption capacities 2 Adsorption/desorption 2 Analyte 2 Atomic absorption spectrometers 2