Determination of Cadmium in Spring Water by Graphite-Furnace Atomic Absorption Spectrometry after Coprecipitation with Ytterbium Hydroxide

Atsumi, Kousuke; Minami, Tomoharu; Ueda, Joichi

doi:10.2116/analsci.21.647

Cited by 34 publications

(21 citation statements)

References 16 publications

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“…In many cases, the usage of a separation and/or preconcentration method is required prior to analysis of the samples in order to improve the sensitivity and accuracy of atomic spectrometric techniques. For this purpose, solvent extraction, 1 ion-exchange, 2,3 electrolytic deposition, 4 vaporization, 5 solid-phase extraction, 6,7 and coprecipitation with phosphates, [8][9][10][11] hydroxides, [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] various dithiocarbamates, [28][29][30][31][32][33] have been proposed for preconcentration and separation of analyte ions from various matrix media. Döner and Ege 34 have investigated for the determination of copper, cadmium and lead in aqueous solutions by flame atomic absorption spectrometry after coprecipitating with aluminum hydroxide.…”

Section: Introductionmentioning

confidence: 99%

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

2008

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A coprecipitation method has been developed for the determination of Cr(III), Mn(II), Fe(III), Co(II), Cu(II), Cd(II) and Pb(II) ions in aqueous samples by flame atomic absorption spectrometry (FAAS) with the combination of pyridine, nickel(II) as a carrier element and potassium thiocyanate as an auxiliary complexing agent. The obtained coprecipitates were dissolved with nitric acid and measured by FAAS. The coprecipitation conditions, such as the effect of the pH, amounts of nickel, pyridine and potassium thiocyanate, sample volume, and the standing time of the precipitate formation were examined in detail. It was found that the metal ions studied were quantitatively coprecipitated with tetrakis(pyridine)-nickel(II)bis(thiocyanate) precipitate (TP-Ni-BT) in the pH range of 9.0 -10.5. The reliability of the results was evaluated by recovery tests, using synthetic seawater solutions spiked with the analyte metal ions. The obtained recoveries ranged from 96 to 101% for all of the metal ions investigated. The proposed method was validated by analyses of two certified reference materials (NIST SRM 2711 Montana soil and HPS Certified Waste Water Trace Metals Lot #D532205). It was also successfully applied to seawater and dialysis solution samples. The detection limits (n = 25, 3s) were in the range of 0.01 -2.44 mg l -1 for the studied elements and the relative standard deviations were £6%, which indicated that this method could fully satisfy the requiremets for analysis of such samples as seawater and dialysis solution having high salt contents.

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Section: Introductionmentioning

confidence: 99%

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

2008

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“…Because of its high sensitivity, low cost and easy operation, graphite furnace atomic absorption spectrometry (GFAAS) has been frequently used for the determination of trace Cd in seawater [1][2][3]. To eliminate the matrix effects, several separation and preconcentration procedures have been proposed, based on solution-phase chelation followed by adsorption onto reversed-phase C 18 substrates [4][5][6], or retention on chelating resins or activated carbon [7][8][9], coprecipitation [10], cloud point extraction [11,12] and flow injection on-line preconcentration techniques [13,14].…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive determination of cadmium in seawater by hollow fiber supported liquid membrane extraction coupled with graphite furnace atomic absorption spectrometry

Peng

Liu

et al. 2007

Spectrochimica Acta Part B: Atomic Spectroscopy

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A new procedure, based on hollow fiber supported liquid membrane preconcentration coupled with graphite furnace atomic absorption spectrometry (GFAAS) detection, was developed for the determination of trace Cd in seawater samples. With 1-octanol that contained a mixture of dithizone (carrier) and oleic acid immobilized in the pores of the polypropylene hollow fiber as a liquid membrane, Cd was selectively extracted from water samples into 0.05 M HNO 3 that filled the lumen of the hollow fiber as a stripping solution. The main extraction related parameters were optimized, and the effects of salinity and some coexisting interferants were also evaluated. Under the optimum extraction conditions, an enrichment factor of 387 was obtained for a 100-mL sample solution. In combination with graphite furnace atomic absorption spectrometry, a very low detection limit (0.8 ng L − 1 ) and a relative standard deviation (2.5% at 50 ng L − 1 level) were achieved. Five seawater samples were analyzed by the proposed method without dilution, with detected Cd concentration in the range of 56.4-264.8 ng L − 1 and the relative spiked recoveries over 89%. For comparison, these samples were also analyzed by the Inductively Coupled Plasma Mass Spectrometry (ICP-MS) method after a 10-fold dilution for matrix effect elimination. Statistical analysis with a one-way ANOVA shows no significant differences (at 0.05 level) between the results obtained by the proposed and ICP-MS methods. Additionally, analysis of certified reference materials (GBW (E) 080040) shows good agreement with the certified value. These results indicate that this present method is very sensitive and reliable, and can effectively eliminate complex matrix interferences in seawater samples.

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“…Preconcentration and separation can solve these problems and can lead to a higher confidence level and easy determination of the trace elements. Several procedures have been developed for the separation and preconcentration of contaminants from environmental matrices, such as: liquid-liquid extraction (LLE) [6][7][8] , co-precipitation [9][10][11] , solid phase extraction (SPE) [12][13][14][15][16][17][18][19][20] .…”

Section: Oriental Journal Of Chemistrymentioning

confidence: 99%

Cloud-Point Method of Extraction Co(II) and Determination by FAAS

Poursharifi¹,

Moghimi²

2012

Orientjchem.

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A new, simple and versatile cloud-point extraction (CPE) methodology has been developed for type equation here.the separation and preconcentration of Co. The metals in the initial aqueous solution were complexed with 2-(2-benzothiazolylazo)-2-p-cresol (BTAC ) and Triton X-114 was added as surfactant. Dilution of the surfactant-rich phase with acidified methanol was performed after phase separation, and the Co contents were measured by flame atomic absorption spectrometry. The variables affecting the cloud-point extraction were optimized using a BoxBehnken design. Under the optimum experimental conditions, enrichment factors of 29 and 25 were achieved for Cdmium. The accuracy of the method was evaluated and confirmed by analysis of the ICPAES. The limits of detection expressed to solid sample analysis were 0.1 µg g -1 (Co). The precision for 10 replicate measurements of 75 µgL "1 Co was 0.9. The method has been successfully applied to the analysis of water samples.

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Determination of Cadmium in Spring Water by Graphite-Furnace Atomic Absorption Spectrometry after Coprecipitation with Ytterbium Hydroxide

Cited by 34 publications

References 16 publications

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

Ultrasensitive determination of cadmium in seawater by hollow fiber supported liquid membrane extraction coupled with graphite furnace atomic absorption spectrometry

Cloud-Point Method of Extraction Co(II) and Determination by FAAS

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