Determinations of Total Mercury in Drinking Water and of Methylmercury in Air by Graphite-Furnace Atomic Absorption Spectrophotometry Using 2,3-Dimercaptopropane-1-sulfonate as a Complexing Agent

Wang, Hou-Chuan; Hwang, Yuh-Chung; Hsieh, Chuan-Jier; Kuo, Mao-Sung

doi:10.2116/analsci.14.983

Cited by 6 publications

(2 citation statements)

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“…methyl mercury) poisoning include instantaneous neurological damage, particularly irritability, paralysis, insanity or blindness; chromosome breakage and birth defects; liver and brain damage. 10,[14][15][16] The toxicity of mercury depends on its chemical state. Inorganic mercury has a very high affinity for protein sulydryl groups, which is accumulated in the kidneys, whereas organic mercury has a greater affinity for the brain.…”

Section: Introductionmentioning

confidence: 99%

“…14,17,18 The ability of living organisms to convert inorganic mercury to organic mercury compounds, which are more toxic and accumulate to a greater extent in living organisms, additionally increases the danger of mercury exposure, even at trace levels. [7][8][9][10][11][12][13][14][15][16][17][18][19] All these ndings cause a great concern regarding public health, demanding an accurate determination procedure of this metal ion at trace and ultra-trace levels.…”

Section: Introductionmentioning

confidence: 99%

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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

Panichlertumpi

Chanthai

2013

Anal. Methods

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The method for preconcentration and trace determination of Hg(II) based on the total fluorescence quenching using a 1,10-phenanthroline (1,10-phen) and dichlorofluorescein (DCF) ternary complex after homogeneous liquid-liquid extraction of the metal complex was developed. Hg(II) ions were dissolved in acid and the sample was complexed with an excess amount of diethyldithiocarbamate (DDTC).The complex of Hg(II)-DDTC formed in an aqueous phase and was extracted into a layer of perfluorooctanoic acid dissolved in lithium hydroxide solution, resulting in $100 mL of the sediment liquid phase prior to analysis of the ternary complex by spectrofluorophotometry. The optimization conditions were investigated in detail including pH and buffer solution, type of ligand, ionic strength, counter ion and micellar medium. Under the optimized conditions with a preconcentration factor between 15 and 20 using a mixture of 0.2 mol L À1 acetate buffer pH 4.5, 2.5 Â 10 À3 mol L À1 1,10-phen, 1% (v/v) Triton X-100 and 2.9 Â 10 À6 mol L À1 DCF in 15 mL final volume, the decrease in fluorescence intensity of the ternary complex was measured against the reagent blank, in the absence of Hg(II) ions, at the excitation and emission wavelengths of 504.0 and 525.0 nm, respectively. The calibration curve was widely linear over the range of 4.0 mg L À1 to 2.0 mg L À1 with a correlation coefficient greater than 0.997. The method recovery of Hg(II) was about 76.9 to 98.2% at a concentration of 250 mg L À1 . The relative standard deviation (RSD) was below 5.5% with a detection limit of 1.0 mg L À1 . The proposed method was successfully applied for the determination of Hg(II) in drinking water, distilled spirit and fruit wine samples. The results obtained were in agreement with those of FI-HGAAS.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Panichlertumpi

Chanthai

2013

Anal. Methods

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Advances in atomic absorption and fluorescence spectrometry and related techniques

Evans

Dawson²,

Fisher

et al. 1999

J. Anal. At. Spectrom.

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Atomic absorption spectrometry 1.5.4 Validation of methodology 2 Atomic fluorescence spectrometry 1.1 Flame atomization 1.1.1 Sample introduction 2.1 Discharge-excited atomic fluorescence 2.2 Laser-excited atomic fluorescence 1.1.1.1 Transport/nebulization 1.1.1.2 Tube-in-flame/atom trapping techniques 3 Laser-based spectroscopy 4 References 1.1.2 Interference studies 1.1.3 Sample introduction by flow injection 1.1.4 Sample pretreatment T his review follows on from last year's1 and describes the 1.1.5 Chromatographic detection 1.2 Electrothermal atomization developments in atomic absorption and fluorescence spectrometry since that time. Included in this review are 1.2.1 Atomizer design and surface modification 1.2.1.1 Graphite atomizers fundamental processes and instrumentation in the areas of atomic absorption and atomic fluorescence spectrometry, 1.2.1.2 Metal atomizers and metallic coatings 1.2.2 Sample introduction together with advances in related techniques such as atomic magneto-optical rotation spectrometry and laser enhanced 1.2.2.1 Slurry and solid sampling 1.2.2.2 Gas sampling ionization. T he review of atomic emission spectrometry may be found in ref. 2. 1.2.2.3 Coupled techniques and preconcentration 1.2.2.4 Electrodeposition Once again, to aid the reader, some of the sub-headings have been modified to reflect the material presented in this year's 1.2.3 Fundamental processes 1.2.4 Interferences review, although the general format is the same as in previous years. 1.2.4.1 Spectral interferences 1.2.4.2 Chemical modifiers-general Comments on the review and suggestions for improvements are welcomed by the review coordinator. 1.2.4.3 Chemical modifiers-palladium 1.2.4.4 Other chemical modifiers 1.2.5 Developments in technique 1 Atomic absorption spectrometry 1.3 Chemical vapour generation 1.3.1 Hydride generation This annual ASU review is based on information selected from 1.3.1.1 General studies of fundamentals, techniques and a database containing approximately 4000 references to analytinstrumentation ical atomic spectrometry. An overview of atomic spectroscopic 1.3.1.2 Determination of individual elements databases available on the World Wide Web has been prepared 1.3.2 Mercury by cold vapour generation by Wiese.3 General reviews of atomic spectroscopy which 1.3.3 Volatile organic compound generation and metal include AAS and AFS have been published by Jackson and vapour separation Lu (531 refs.)4 and He and Shu (378 refs.).5 1.4 Spectrometers One of the most interesting developments reported for some 1.4.1 Light sources time has been the detection of atomic absorption in aqueous 1.4.2 Continuum source and multi-element AAS solution by Panichev and Sturgeon.6 Dilute solutions of NaBH 4 1.4.3 Background correction (0.0025%) were merged with ppm solutions of Ag, Cu and Pd 1.4.4 Detectors in a custom-built spectrophotometric flow cell mounted in 1.5 Chemometrics and computerization place of the burner in an AA spectrophotometer. A back-1.5.1 Calibration ground corrected AA signal was detected during the ...

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Determination of Trace Amounts of Arsenic(III) and Arsenic(V) in Drinking Water and Arsenic(III) Vapor in Air by Graphite-Furnace Atomic Absorption Spectrophotometry Using 2,3-Dimercaptopropane-1-sulfonate as a Complexing Agent

1999

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Cumulative excess amounts of arsenic in our body may cause liver, lung, kidney, bladder or skin cancers, and chronic poisoning. [1][2][3] In the southwest coastal region of Taiwan (Tainan and Chia-I county) 1 , a few residents had for more than 30 years been drinking deep groundwater containing high levels (600 -700 µg/l) of arsenic compounds 4,5 , which caused Blackfoot Disease. Based on this phenomenon, the USEPA and Taiwan government have considered decreasing the allowable contamination levels of total arsenic in drinking water to be 2 -20 µg/l 6 and 10 µg/l, respectively.As(III) is considered to be more toxic than As(V), which is in turn more toxic than organic arsenics. The 8-h average permissible exposure limit for As 2 O 3 in air was recommended not to exceed 0.01 mg/m 3 of As by OSHA.7 Several methods commonly used for the determination of the amounts of arsenic species in water are flow-injection with graphite-furnace atomic absorption spectrometry (FI-GFAAS) 8 , or with hydride generation atomic absorption spectrometry (FI-HGAAS); 9,10 chelating extraction and then HGAAS 11 , or neutron activation analysis; 12 HPLC and then HGAAS 4 , or HG-ICPMS; 13 and ion chromatography-HG-ICPMS.14 The As 2 O 3 vapor in air determined by NIOSH 7 was collected on a Na 2 CO 3 -impregnated cellulose ester membrane. After digestion and the addition of Ni 2+ , an aliquot (25 µl) was analyzed by GFAAS. The detection limit was 0.06 µg per sample and the linear range was 0.67 -32 µg/m 3 as As for a 400-l sample.2,3-Dimercaptopropane-1-sulfonate (DMPS) has been used as an antidote for mice 15 and human 16 poisoning with sodium arsenite, and Ni 2+ has been commonly used as a chemical modifier in GFAAS 5,17,18 to form a stable compound of NiAs. 19 In this paper, we used DMPS as a complexing agent for As(III) in ammonium acetate buffer of pH 5.5. The complex of As(III)-DMPS was selectively retained on Sep-Pak C 18 cartridges and then concentrated in methanol; while As(V) could not be retained in this way. The As(V) was pre-reduced to As(III) with L-cysteine 9,13,20,21 and the total amount of As(III)+As(V) was determined. The amount of As(V) was obtained by subtracting As(III) from [As(III)+As(V)]. Hence, trace amounts of As(III) (up to 200 ng) and As(V) (up to 100 ng) in drinking water (25 ml) could be accurately determined by GFAAS. The applicability for the determination of As(III) vapor in air was also attempted. Experimental ApparatusA Hitachi Z-8000 graphite-furnace atomic absorption spectrophotometer, equipped with a Zeeman back- Department of Environmental Science, Tunghai University, Taichung 407, Taiwan, Republic of ChinaAs(III) (12.5 -200 ng) in drinking water (25 ml) reacted with 2,3-dimercaptopropane-1-sulfonate (DMPS, 0.60 mg) in ammonium acetate buffer (2.0 mmol, pH 5.5) and formed a complex of As(III)-DMPS. The complex was selectively retained on two Sep-Pak C18 cartridges in series, while As(V) could not be retained. Each cartridge was eluted with methanol (2.00 ml). After addition of Ni 2+ (2.0 mg), a portion ...

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Determinations of Total Mercury in Drinking Water and of Methylmercury in Air by Graphite-Furnace Atomic Absorption Spectrophotometry Using 2,3-Dimercaptopropane-1-sulfonate as a Complexing Agent

Cited by 6 publications

References 11 publications

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

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

Advances in atomic absorption and fluorescence spectrometry and related techniques

Determination of Trace Amounts of Arsenic(III) and Arsenic(V) in Drinking Water and Arsenic(III) Vapor in Air by Graphite-Furnace Atomic Absorption Spectrophotometry Using 2,3-Dimercaptopropane-1-sulfonate as a Complexing Agent

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