On-line pre-reduction of pentavalent arsenicals by thioglycolic acid for speciation analysis by selective hydride generation–cryotrapping–atomic absorption spectrometry

Selective Speciation of Ferric Iron by a New Heterocyclic Ligand

The synthesis and analytical applications of the new heterocyclic ligand are described. The complexation reaction of the ligand with some cations was studied in aqueous methanol at room temperature using the spectrophotometric method. Results revealed that only the absorption spectra of the Fe (III)–ligand complex show a high redshift of the absorption maximum in the aqueous methanol soluti...

Redox speciation analysis of antimony in soil extracts by hydride generation atomic fluorescence spectrometry

A sensitive atomic spectrometric method for the redox speciation analysis of antimony in soils is described. The method is based on the selective generation of stibine from Sb(III) in a continuous flow system using atomic fluorescence spectrometry for detection. Sb(V) is masked by citric or oxalic acid in HCl medium. The procedure was optimized with synthetic solutions of Sb(III) and Sb(V). The...

Optimization study of suitable pre-reduction agents for selenium analysis in tomato samples by flow injection-hydride generation atomic absorption spectrometry

The pre-reducing agents for Se speciation analysis were subject to optimize under the online reduction conditions of flow injection-hydride generation atomic absorption spectrometry using 2 M HCl as a carrier solution and 0.3% (w/v) NaBH4 in 0.2% (w/v) NaOH as a reducing agent. For total Se, the pre-reduction of Se6+to Se4+must be completed when optimizing the prereducing conditions using (i) c...

Cr (VI)/Cr (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY

Speciation determination of arsenic in urine by high-performance liquid chromatography-hydride generation atomic absorption spectrometry with on-line ultraviolet photooxidation.

A coupled system for arsenic speciation determination based on high-performance liquid chromatography (HPLC), on-line UV photooxidation and continuous-flow hydride generation atomic absorption spectrometry (HGAAS) was built from commercially available modules with minor modifications to the electronic interface, the software and the gas-liquid separator. The best results were obtained with stro...