Determination of very low levels of dissolved mercury(II) and methylmercury in river waters by continuous flow with on-line UV decomposition and cold-vapor atomic fluorescence spectrometry after pre-concentration on a silica gel-2-mercaptobenzimidazol sorbent

Dithizone-functionalized solid phase extraction–displacement elution-high performance liquid chromatography–inductively coupled plasma mass spectrometry for mercury speciation in water samples

“…Moreover, the ethylation-based method cannot be used for ethylmercury determination. In recent years, other pre-concentration methods were reported including solid phase micro-extraction [3][4][5], liquid phase micro-extraction [6][7][8], cloud point extraction [9,10] and solid phase extraction (SPE) [11][12][13][14][15][16][17][18][19]. For solid phase micro-extraction, derivatization procedure such as hyride, ethylation or phenylation derivatization is often necessary to transform inoganic mercury (IHg) and organomercurials into their volatile species.…”

“…Solid phase extraction is relatively simple, convenient and easy to automate. In past decade, various synthesized chelating sorbents have been reported to concentrate IHg and MeHg by using solid phase extraction mode [12,13]. Dithizone-anchored poly(ethylene glycol dimethacrylate-hydroxyethylmethacrylate) microbeads were synthesized to pre-concentrate inorganic and organic mercury compounds.…”

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

“…It should be noted that the detection limits obtained by the proposed method are comparable to those reported for other preconcentration approaches of mercury species based on: (i) on-line SPE in FI systems by the use of a minicolumn filled with complexing solid sorbent, with detection limits of 16 ng l −1 [2] or 10 ng l −1 [4] when CVAAS was used as detection technique; and 6 ng l −1 for methylmercury determination [6], or 0.07 and 0.05 ng l −1 for inorganic mercury and methylmercury determination, respectively [9], when CVAFS was the detection technique employed; (ii) off-line enrichment on complexing resins; (iii) retention on solid sorbent and slurry sampling technique with a detection limit of 2000 ng l −1 for total mercury determination by ETAAS [14], or 50 ng l −1 for phenylmercury determination by CVAAS [15]. As can be seen the lowest detection limits not only corresponded to the use of more sensitive detection techniques, such as CVAFS, but also to the great sample volume required (1 l).…”

“…Emteborg et al [8] incorporated a microcolumn of dithiocarbamate resin in a FI system to preconcentrate mercury species, being used acidic thiourea as eluent. On the other hand, mercury compounds were preconcentrated on a column containing 2-mercaptobenzimidazol loaded on silica gel and then quantitatively eluted with 0.05 mol dm −3 potassium cyanide or 2 mol dm −3 hydrochloric acid for inorganic mercury or methylmercury, respectively [9].…”

Deter mination of Hg2+ using a glassy carbon electrode modified with [ZnSO4{ZnCl2(u-S-CH2CH2NH2}]n

“…The determination analysis of mercury(II) in water environment is one of the focuses of the scientific research. Several analytical techniques, such as atomic absorption spectrometry [5] , fluorescence spectrometry [6][7][8] , atomic fluorescence spectrometry [9] , quantum dots [10] , nanosensor [11][12][13] , and biosensors [14] have been applied for the determination of the value of mercury(II) in analytical samples. The above mentioned analytical method are preferred for their sensitivity, reproducibility, and easy surface renewal.…”