The dependence of the color of quartz and opal natural minerals, collected from different localities in the Republic of Macedonia (Alinci, Belutče, Budinarci, Mariovo, Sasa, Saždevo, Čanište, Češinovo, Zletovo) on their element composition is studied using Fourier transform infrared spectroscopy (FT IR), micro-Raman spectroscopy and atomic absorption spectrometry (AAS). In order to determine th...

A simple, accurate and reliable method for direct electrothermal atomic absorption spectrometric (ETAAS) determination of chromium in serum and urine samples without any preliminary sample pretreatment is described. Instrumental parameters are optimized in order to define: the most suitable atomizer, optimal temperature program and efficient modifier. An appropriate quantification method is pro...

Since matcha includes all leaf parts seems desirable to measure contents of elements before and after digestibility. This paper examines in vitro digestibility, mineral trace element digestion their leaching ability during ice tea processing. Digestibility values measured enzymatically reached 71.3 %. High K, Mg, Mn, Ca, Fe Zn were recorded by FAAS/ETAAS. Interestingly, concentrations non-diges...

New materials have significant impact on development of new methods and instrumentation for chemical analysis. From the discovery of carbon nanotubes in 1991, single and multi-walled carbon nanotubes (SWCNTs and MWCNTs) -due to their high adsorption and desorption capacitieshave been employed as sorption substrates in solid-phase extraction for the preconcentration of heavy metals from diverse ...

Determining the level of contaminants in rice is very important because it one staple foods consumed by most people worldwide. Therefore, quantity arsenic has become a health concern cultivars have property accumulating their grains. As result, various societies mandated measurement using different analytical chemistry methodologies, including atomic absorption spectrometry (AAS, ETAAS, HG-AAS)...

A fully automated procedure for the determination of rhodium has been developed using flow injection (FI) on-line microcolumn preconcentration coupled with electrothermal atomic absorption spectrometry (ETAAS). The proposed FI manifold and its operation make possible the introduction of the total eluate volume into the graphite atomizer, avoiding the necessity for optimisation of subsampling th...