Mercury volatile species generation from HCl and TRIS buffer media: Quantification of generation efficiency and characterization of severe changes in speciation information due to de-alkylation

Dielectric barrier discharge-assisted determination of methylmercury in particulate matter by atomic absorption spectrometry

“…The measurable signal originating from a methylmercury-only solution with an inoperative DBD was intriguing and somewhat unexpected. However, these results agree with those reported by Migasova et al 30 , who demonstrated that methylmercury could be de-methylated to produce Hg 0 under typical CVG conditions employing 0.5 mol L −1 HCl and 1.0% NaBH 4 . 30 Accordingly, the signal detected for methylmercury in the absence of a DBD plasma, i.e.…”

“…However, these results agree with those reported by Migasova et al 30 , who demonstrated that methylmercury could be de-methylated to produce Hg 0 under typical CVG conditions employing 0.5 mol L À1 HCl and 1.0% NaBH 4 . 30 Accordingly, the signal detected for methylmercury in the absence of a DBD plasma, i.e., without an atomizer, was likely due to condensed-phase de-methylation of the analyte. The next step would be to determine a condition that could eliminate the parallel reactions in order to assure quantitative conversion of methylmercury into its gas phase hydride.…”

Ultratrace determination of arsenic by hydride generation atomic absorption spectrometry with preconcentration on gold nanoparticles

“…Two of them were solid: gold wire (specied in Section 2.1) and powdered gold coated alumina (amalgamator lling) used commercially to preconcentrate mercury cold vapors in Hg analyzers. 26,27 The last material tested was the solution of gold nanoparticles (AuNPs) (see Section 2.1 for details). For the sake of simplicity, empty amalgamator tubes were used as traps also with the other two gold based preconcentration materials tested.…”