in this research, a rapid, reliable and selective dispersive liquid-liquid microextraction (dllme) followed by direct injection of microdroplet to graphite furnace atomic absorption spectrometry (gf-aas) method for the determination of ultra-trace amounts of ag(i) was developed. effect of the important experimental parameters on the extraction efficiency of ag(i) was investigated using response...

Separation or formulation of products by supercritical fluids and production of substances and composites with unique properties and characteristics for the use in different applications are nowadays intensively studied. One of the most important advantages using supercritical fluids is selective extraction of components or fractionation of total extracts. As yet, industrial dense gas extractio...

Content extraction signatures (CES) enable the selective disclosure of verifiable content from signed documents. We have previously demonstrated a CES Extraction Policy for fragment grouping to allow the document signer to designate which subsets of the original document are valid subdocuments. Extending this ability, we introduce a newHierarchical Grouping Extraction Policy that is more powerf...

Flavonoids from Sophora flavescens were selectively extracted by mechanochemical-promoted extraction technology (MPET) after using response surface methodology to determine the optimal extraction parameters. The highest yield of 35.17 mg/g was achieved by grinding the roots with Na₂CO₃ (15%) at 440 rpm/min for 17.0 min and water was used as the sole solvent with a ratio of solvent to solid mate...

This licentiate thesis is based on two papers that describe two original methods for analysing environmental pollutants. In both cases samples were extracted by onor off-line Matrix Solid Phase Dispersion (MSPD), then target analytes were separated from potentially interfering matrix components and analysed by Liquid Chromatography–Mass Spectrometry (LC-MS). Hot water and a small volume of meth...

In this research, a rapid, reliable and selective dispersive liquid-liquid microextraction (DLLME) followed by direct injection of microdroplet to graphite furnace atomic absorption spectrometry (GF-AAS) method for the determination of ultra-trace amounts of Ag(I) was developed. Effect of the important experimental parameters on the extraction efficiency of Ag(I) was investigated using response...

In the present study a cloud-point extraction process using non-ionic surfactant Triton X-114 for selective extraction of gallium from aqueous solutions was developed. The method is based on the complex formation of Ga (III) with N, N′ -bis (salycilidene)-1, 2-phenylenediamine (salophen) as a chelating agent in buffer media of pH 5. After phase separation and dilution of the surfactant-rich pha...