Current Analytical Chemistry - Volume 6, Issue 2, 2010

The hyphenation of separation methods with mass spectrometry (MS) is one of the major topics in analytical chemistry. This is not only true for pressure-driven methods like HPLC but also for electro-driven ones such as capillary electrophoresis (CE). Research during the first years of CE-MS was primarily focused on technical improvements leading to commercially available equipment, making this combination more reliable Read More

The determination of trace analytes in some types of samples by capillary electrophoresis (CE) requires their prior extraction from the sample matrix and preconcentration. The preconcentration step is the bottleneck of many analytical processes, which should ideally involve as few operations as possible in order to minimize potential errors and shorten analysis times. There is a growing search for more environment Read More

In this study, we prepared two different type complex groups. One of them is based on Schiff base (A1 , A2 and A3) Cd(II) complexes, another one is β-blockers (acebutolol (ACE), atenolol (ATE) and propranolol (PRO)) Cu(II) complexes. The ligands and their metal complexes were characterized by elemental analyses, mass spectra, 1H(13C) NMR spectra, FT-IR, UV-vis, conductivity measurements and thermal analysis studies. Prot Read More

A new solid-phase extraction method was developed for trace analysis of cobalt on Duolite XAD-761 resin by using flame atomic absorption spectrometry (FAAS). The optimum experimental conditions for the quantitative sorption of Co(II)-PAR (cobalt chelates with 4-(2-Pyridylazo) resorcinol), pH, effect of sample flow rate, concentration of eluent, sorption capacity of resin and the effect of diverse ions on the preco Read More

A potentiometric stripping method for the measurement of lithium ions at a carbon paste electrode modified with spinel-type manganese oxide is described. The procedure is based on the effective pre-concentration of lithium ions on an electrode surface containing spinel-type MnO2, with the reduction of Mn(IV) to Mn(III), and the consequent intercalation (insertion) of the lithium ions into the spinel structure. The best current c Read More

This paper describes a potassium ion-selective electrode based on 2,2'-dithiodibenzoic acid with a focus on the sub-Nernstian response characteristics. The topics including the experimental parameters that influence the response of the electrode, useful membrane compositions and applications were investigated. The membrane electrode demonstrate linear (R2= 0.999) sub-Nernstian responses, with the slop of 40.1 Read More

The transparency of the eye lens is vital for maintenance of good image quality to the eye. This is lost when the lens develops a cataract which is a manifestation of changes to the structural proteins and their organisation. Understanding the complex arrangements and interactions of proteins in the lens and how these alter with opacification requires a means of probing the intact tissue. Nanoparticles offer such potential but need Read More

A method has been developed to determine a trace concentration of individual polycyclic aromatic hydrocarbons (PAHs) and organochlorinated pesticides (OCPs) in sewage sludge sample. Sewage sludge samples were collected from three wastewater treatment plants (WWTPs) located at different areas in Kuwait. The new method was based on, utilizing gas chromatography-mass spectrometry with ion trap technique for t Read More