A new approach to the studies of submicron particle suspensions based on the effect of pressure in capillary zone electrophoresis.

A new approach based on the effect of pressure in CZE is suggested for acceleration of particle migration in electrophoretic runs resulting in reduction of the analysis time. It provides conditions for studying fast processes in suspensions. The effect of pressure on the migration of silica spheres with average diameters of 100, 150, and 390 nm was studied by CZE at an applied voltage of 25 kV.

Solid-phase extraction of plutonium in various oxidation states from simulated groundwater using -benzoylphenylhydroxylamine.

Solid-phase extraction of plutonium in different individual and mixed oxidation states from simulated groundwater (pH 8.5) was studied. The extraction of plutonium species was carried out in a dynamic mode using DIAPAK C16 cartridges modified by -benzoylphenylhydroxylamine (BPHA).

Suspension column for recovery and separation of substances using ultrasound-assisted retention of bead sorbents.

A novel approach to sorption recovery and separation of different substances is proposed which is based on the use of suspended bead sorbents instead of conventional packed beds of such sorbents. This makes it possible to employ small-sized beads which are trapped in a low-pressure column due to ultrasound-assisted retention, without any frits to hold the sorption material. A flow system including a separation mini-column, named herein a suspension column, has been developed and tested by the studies of solid phase extraction (SPE) of trace metals from bi-distilled water and sea water using a 150-μL column with a silica-based sorbent containing iminodiacetic groups (DIAPAK IDA) and having a grain size of 6 μm.

Fractionation and characterization of nano- and microparticles in liquid media.

Submicron and micron particles present in liquid environmental, biological, and technological samples differ in their dimensions, shape, mass, chemical composition, and charge. Their properties cannot be reliably studied unless the particles are fractionated. Synthetic particles applied as components of analytical systems may also need preliminary fractionation and investigation.

Investigation of iron oxide nanoparticles by capillary zone electrophoresis.

The electrophoretic behavior of gamma-Fe(2)O(3) nanoparticles was studied in aqueous solutions of Na(2)SO(4)-NaOH (pH 10.8) and of Na(2)SO(4)-Na(3)cit (pH 7.1) as running electrolytes.