Speciation analysis of mercury in water samples by cold vapor atomic absorption spectrometry after preconcentration with dithizone immobilized on microcrystalline naphthalene

Abstract

Trace amounts of inorganic mercury (Hg(2+)) and methylmercury cations (MeHg(2+)) were adsorbed quantitatively from acidic aqueous solution onto a column packed with immobilized dithizone on microcrystalline naphthalene. The trapped mercury was eluted with 10 ml of 7 mol L(-1) hydrochloric acid solution. The Hg(2+) was then directly reduced with tin (II) chloride, and volatilized mercury was determined by cold vapor atomic absorption spectrometry (CVAAS). Total mercury (Hgt) was determined after decomposition of MeHg(+) into Hg(2+). Hg(2+) and MeHg(+) cations were completely recovered from the water with a preconcentration factor of 200. The relative standard deviation obtained for eight replicate determinations at a concentration of 0.3 microg L(-1 )was 1.8%. The procedure was applied to analysis of water samples, and the accuracy was assessed via recovery experiment.

Ultra-trace determination of Hg(ii) in drinking water and local Thai liquors using homogeneous liquid–liquid extraction followed by fluorescence quenching of its ternary complex

“…The most widely used techniques for the quantication of Hg(II) are based on cold vapor atomic absorption spectrometry. 15,[20][21][22][23][24][25][26][27][28] Other published methods include anodic stripping voltammetry, potentiometry, gas or liquid chromatography, inductively coupled plasma mass spectrometry, neutron activation analysis, atomic absorption or emission or uorescence spectrometry and X-ray uorescence spectrometry. 19,[29][30][31][32][33][34] Although, all of these methods are characterized by their high sensitivity, they require lengthy procedures, expensive and complex instrumentation or exhibit a lack in sensitivity.…”

“…Several methods commonly used for the preconcentration of mercury are based on gold, silver or alloys, 13,38,39 purge and trap injection, 9,40 liquid-liquid extraction, [41][42][43] co-precipitation, 13,15 solid-phase extraction 17,21,44,45 and solid-phase microextraction. 46,47 Moreover, the solid-phase extraction cartridges and disks modied by suitable ligands such as dithiocarbamate, 15,48 dithizone, 20,22,44 diethyldithiocarbamate, 40,49 dipyridylcarbamate, histidine, thioanilide, 15 imidazole or 6-mercaptopurine 15,39,40 have been successfully used for the selective separation and determination of mercury. Nevertheless, the most popular techniques used for the preconcentration of mercury are liquid-liquid extraction and solid-phase extraction.…”

Preconcentration, speciation and determination of ultra trace amounts of mercury by modified octadecyl silica membrane disk/electron beam irradiation and cold vapor atomic absorption spectrometry

“…Although different approaches have been proposed for mercury determination at trace level by CVAAS [5][6][7], the recent development in the filed of the preconcentration of mercury ions are focused to solid phase extraction (SPE) [4,[8][9][10][11][12]. In compare to classical liquid-liquid extraction, SPE methods are easier to perform, less expensive from a labor and solvent consumption stand point and can help to provide an overall safer working environment.…”

Flame Atomic Absorption Spectrometric Determination of Trace Amounts of Silver after Solid‐Phase Extraction with 2‐Mercaptobenzothiazole Immobilized on Microcrystalline Naphthalene

“…The extraction of metal chelates with microcrystalline naphthalene by adding an acetone solution of naphthalene is more rapid [12]. In recent years, column extraction of metal ions with modified microcrystalline naphthalene has attracted many researchers [13,14].…”