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A modified automated on-line hyphenated system for simultaneous inorganic ionic mercury (Hg 2+ ) and monomethylmercury (MeHg + ) analysis by hydride generation (HG) or ethylation (Eth), cryofocussing, gas chromatography (GC) separation and atomic fluorescence spectrometry (AFS) detection has been improved. Both derivatization methods are investigated with respect to the chromatographic...
A new solid substrate-room temperature phosphorimetry method for the determination of trace mercury has been established. It bases on the fact that in acetic acid medium, Hg 2+ ion can catalyze the substitute reaction of CN - ligand in [Fe(CN) 6 ] 4- by 2,2'-bipyridyl (bipy), and the resultant [Fe(bipy) 3 ] 2+ cation can react with FinBr...
A new sample preparation procedure based on tandem (that is, different diameter probe sonicators used in the same sample treatment) focused ultrasound (TFU) for mercury separation, preconcentration and back-extraction in aqueous solution from human urine has been developed. The urine is first oxidized with KMnO 4 /HCl/focused ultrasound (6mm probe). Secondly, the mercury is extracted and preconcentrated...
A commercially available mercury (Hg) analyzer based on sample combustion, gold amalgamation, and atomic absorption spectrometry (AAS) was evaluated for the direct determination of Hg in composites of human hair and individual samples of horse fur. Results for human hair reference material (NIES No. 13) were within the certified range. Analyses of ''blind'' samples from an international interlaboratory...
A simple and robust time-based on-line sequential injection system for trace mercury determination via cold vapour atomic absorption spectrometry (CVAAS), employing a new integrated gas-liquid separator (GLS), which in parallel operates as reactor, was developed. Sample and reductant are sequentially loaded into the GLS while an argon flow delivers the released mercury vapour through the atomic absorption...
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