A new method for the detection of trace levels of organomercury species has been developed by combining the high enrichment capacity of purge and trap with aqueous phenylation derivatization. Phenylation products of monomethylmercury (MeHg) and monoethylmercury (EtHg) were first separated by capillary gas chromatography and then detected by atomic fluorescence spectrometry (AFS) or inductively ...

ZnO and TiO2 are semiconductor nanomaterials that widely used in photocatalysis. However, the relatively high recombination rate low quantum yield of photogenerated electron–hole pairs limit their practical applications. In this study, a series TiO2/ZnO/diatomite composites with various compositions were successfully prepared via two-step precipitation method. They exhibited stronger UV–visible...

Abstract Origins of medieval lead artefacts are hard to establish due re-smelting and mixing. One can obtain conclusive evidence from ingots that served for bulk trade originated directly the mines. This paper aims analyse thirteenth century ingot Wroc?aw (Poland). To its origins we analysed structure chemical composition. We used archaeometric methods: light electron microscopic observations, ...

Novel internally quenched fluorescence peptide substrates containing sequence specific sites for cleavage by multiple proteases were designed and synthesized. The 28 and 29 residue peptides contain an N-terminal fluorescence acceptor group, 4-(4-dimethylaminophenylazo)benzoic acid (DABCYL), and a C-terminal fluorescence donor group, 5-(2-aminoethylamino)naphthalene-1-sulfonic acid (EDANS). Effi...

A novel thiosemicarbazide-based fluorescent sensor (AFC) was developed. It successfully applied to detect hypochlorite (ClO−) with fluorescence quenching in bis-tris buffer. The limit of detection AFC for ClO− analyzed be 58.7 μM. Importantly, could employed as an efficient and practical water sample zebrafish. Moreover, showed a marked selectivity over varied competitive analytes reactive oxyg...

Mussels Mytilus galloprovincialis collected and bought from different locations (Slovenian coastline, Italy and NE Pacific) were analysed by techniques of hydride generation atomic fluorescence spectrometry (HG-AFS) and liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS) in order to assess selenium (Se), its distribution and Se species in raw and cooked s...

Calcite crystals were grown from solution with single-crystal dimensions up to 3 mm and doped up to 0.1 at% with Nd ions. Phase purity was verified by powder X-ray diffraction. The concentration of Nd was measured by energy-dispersive spectrometry and Rutherford backscattering spectrometry. Micro X-ray fluorescence mapping of the calcite grains indicates uniform Nd distribution in as-grown crys...

A comparison between two fluorescent metal chelates for staining proteins separated by electrophoresis has been carried out. One of these chelates is ruthenium II tris (bathophenanthroline disulfonate) and the other is commercial Sypro Ruby. Both can be efficiently detected either with UV tables or with commercial laser fluorescence scanners. The sensitivity and homogeneity of the stains and th...

Atomic Absorption Based Techniques. Atomic Fluorescence Spectroscopy. Figure 1.3 Schematic diagram showing the before (left) and after (right) the draw the sample into a nebulizer by the Bernoulli Effect where it is converted. Atomic absorption and emission spectroscopy in the ultraviolet and visible A schematic diagram of a UV-Vis spectrophotometer is shown in Figure.11. Preface Inductively co...

• Potential new method for palaeopathological analysis. Assessment of pathological conditions using portable x-ray fluorescence. Impact diagenesis on trace elements in human skeletal remains. This study aims to investigate the potential X-ray fluorescence spectrometry (pXRF) identifying archaeological Bone element distribution relation known disease categories is analyzed pXRF from femora 73 in...