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Multi-wall carbon nanotubes (MWNTs) are modified with branched cationic polyethyleneimine (BPEI). The MWNTs–BPEI nanocomposites serve as a novel adsorbent and exhibit favorable selectivity toward adsorption of As(V). Appropriate amount of MWNTs–BPEI suspension containing ca. 5mg of the composites is used to pack a mini-column for on-line solid phase extraction preconcentration of inorganic arsenic...
A novel fluid mixing strategy was developed which significantly enhanced the efficiency of DNA hybridization. A pneumatic micro-mixing device consisting of two pneumatic chambers and an underneath DNA microarray chamber was built up. The fluid in the array chamber was pneumatically pumped alternately by the two pneumatic chambers. The chaotic oscillatory flow caused by the pumping greatly intensified...
The separation and speciation of inorganic arsenic(III) and arsenic(V) are facilitated by employing a novel sequential injection system incorporating two mini-columns followed by detection with hydride generation atomic fluorescence spectrometry. An octadecyl immobilized silica mini-column is used for selective retention of the complex between As(III) and APDC, while the sorption of As(V) is readily...
A high sensitive chromium speciation procedure based on spectrophotometric detection was developed by coupling flow injection on-line preconcentration with a catalytic indicator reaction. Chromium(VI) is retained on a mini-column packed with polystyrene anion exchange resin (strong basic 717 resin), which was afterwards eluted with a small volume of NaNO 3 solution. The eluted Cr(VI) is then...
A sensitive procedure for the quantification of total protein bovine serum albumen (BSA) in human serum was presented with sequential injection sampling and fluorometric detection. A few microliters of sample and fluorescamine solutions were aspirated into the holding coil to facilitate the reaction of protein with fluorescamine by giving rise to a blue-green–fluorescent derivative. The derivative...
A micro-sequential injection spectrophotometric procedure for DNA assay was developed based on the employment of a lab-on-valve (LOV) meso-fluidic analytical system. A small amount of crystal violet solution (10μl) was de-colored inside the flow cell of the LOV at the presence of 5μl λ-DNA/HindIII within a certain pH range, and the absorbance decrease of crystal violet solution at 591nm was measured...
A simple flow injection on-line dilution procedure with detection by inductively coupled plasma mass spectrometry (ICP-MS) was developed for the determination of copper, zinc, arsenic, lead, selenium, nickel and molybdenum in human urine. Matrix effects were minimized by employing a dilution factor of 16.5 with on-line standard addition, and 103 Rh was used as internal standard to...
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