Mercury speciation by coupling cold vapour atomic absorption spectrometry with flow injection on-line preconcentration and liquid chromatographic separation

Voltammetric determination of methylmercury and inorganic mercury with an home made gold nanoparticle electrode

“…Such techniques include selective extraction in an organic solvent, extraction via complex formation followed by separation by gas chromatography [8,9] or high-performance liquid chromatography [10,11] combined with a detection technique such as atomic emission [12,13], absorption [14,15] or fluorescence spectrometry [16,17], inductively coupled plasma mass spectrometry [18,19] or electrochemical methods, like amperometry [20] or coulometry [21].…”

Determination of methylmercury and inorganic mercury in water samples by slurry sampling cold vapor atomic absorption spectrometry in a flow injection system after preconcentration on silica C18 modified

“…A diversity of combinations between solid sorbent and complexing agent have been employed for preconcentration of both inorganic mercury and methylmercury: (i) on-line formation of mercury diethyldithiocarbamates on silica C 18 and quantitative elution of the retained chelates with ethanol [2,3]; (ii) chelation with dithiophosphoric acid diacyl ester (DDTP), adsorption of the corresponding chelates on a C 18 column and elution with ethanol [4]; (iii) sorption of the mercury complexes formed with ammonium pyrrolidine dithiocarbamate (APDC) on silica C 18 , which were after eluted with a methanol-acetonitrile-water mixture [5].…”

Mercury(ii) and methylmercury determination in water by liquid chromatography hyphenated to cold vapour atomic fluorescence spectrometry after online short-column preconcentration

“…Most importantly, its stronger tolerance to complex matrices endows it with better capability of online applications. 9 In solid phase extraction as a preconcentration step, C18 cartridges have been the most widely used stationary phase, both directly and aer derivatisation [15][16][17][18][19][20][21][22][23][24] with a wide range of complexing agents, most of which contain sulphur, such as 2-mercaptoalcohols, dithiocarbamates, dithizones, triazenes, and even bacteria. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] A wide variety of eluting agents have also been used to desorb mercury species from the stationary phase, such as acidic solutions, thiourea solutions, mobile phases with organic-modiers, aqueous solutions with a reagent containing sulphur, and even a mixture of these kinds of solutions with an organic solvent, among others.…”