a simple, rapid and sensitive solvent assisted-dispersive solid phase extraction method was developed for the extraction of iron(ii) prior to its spectrophotometric determination. the fe(ii) reacted with 2,4,6-tris(2-pyridyl)-1,3,5-triazine, neutralized with sodium dodecyl sulfate and extracted onto the fine particles of benzophenone which were formed upon rapid injection of a mixture of benzop...

in this work a rapid and selective procedure for separation and preconcentration of lead(pb2+) before determination by electrothermal atomic absorption spectrometry (etaas) wasdeveloped. the procedure is based on the electrodeposition on a graphite probe modified withpalladium. the lead was deposited from acetate buffer solution at ph 5.5. various parameters,such as ph of solutions, deposition ...

A novel, simple, sensitive and effective method has been developed for preconcentration of the trace Pb (II) ions in aqueous Samples by CNT carboxyl which in order to improve the performance of extraction and preconcentration was used. Amounting of the ions density in solution was performed by the method of flame atomic absorption spectrometry. The effective parameters on extraction such as: ef...

a new method for the separation and preconcentration of trace amounts of cadmium in food and water samples by magnetic solid phase extraction (mspe) with fe3o4 magnetic nanoparticles (fe3o4-mnps) and its determination by flame atomic absorption spectrometry has been developed. for this purpose, fe3o4-mnps were synthesized via chemical precipitation method. the extraction of cadmium ions from th...

Dry-column vacuum chromatographic technique is introduced for remediation of wastewater the first time. A previously prepared chemically modified silica gel containing covalently immobilized Hg2+-selective acridino-crown ether selector molecules was used as an adsorbent. Removal Hg2+ from highly contaminated river water carried out to study practical applicability. Adsorption capacity, preconce...

An overview of the state-of-the-art in the use of lyophilization for the pretreatment of samples and standards prior to their storage and/or preconcentration is presented. The different analytical applications of this process are dealt with according to the type of material (reagent, standard, samples) and matrix involved.

This work presents a microfluidic device that can be used to detect the presence of viral pathogens in environmental water samples. The device integrates a membrane-based preconcentration unit with an electrochemical biosensor on the same platform. This integration has the potential to increase the sensitivity of detection thereby enabling detection of small concentrations of viruses at environ...

Received 03 May 2013, Revised 28 December 2013, Accepted 31 December 2013 -------------------------------------------------------------------------------------------------------------------------------------------Abstract A new cloud point extraction (CPE) method for the preconcentration of trace iron speciation in natural waters prior to determination by flame atomic absorption spectrometry (F...