Preconcentration of copper in water samples with mercaptobenzothiazole on naphthalene

Satake, Masatada; Ishida, Kenji; Puri, B. K.; Usami, Shiro

doi:10.1021/ac00125a032

Cited by 25 publications

(3 citation statements)

References 9 publications

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“…The excess of peroxide was decomposed by heating the sample on the water-bath. The solution was cooled, ®ltered if needed and diluted to 100 mL with distilled water in a standard¯ask [42]. An aliquot (40±100 mL) of this solution was taken and the general procedure (2.4 and 2.5) was applied after masking iron(III) with 2 mL of 5 % triethanolamine solution during the preconcentration step.…”

Section: Analysis Of Bismuth In Standard Alloysmentioning

confidence: 99%

Differential Pulse Polarographic Determination of Trace Amount of Bismuth in Various Complex Samples After Preconcentration of Its 1-(2-Pyridylazo)-2-naphthol Complex by Column and Microcrystalline Naphthalene Methods

Taher

Puri

1999

Electroanalysis

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A differential pulse polarographic method has been developed for the determination of trace amount of bismuth in various complex samples after adsorption of its 1-(2-pyridylazo)-2-naphthol on naphthalene in the pH range 8.0±10.0. After ®ltration, the solid mass is shaken with 8 mL of 1 M hydrochloric acid, mixed with 2.0 mL of 1 M pyridine solution and determined with a differential pulse polarograph. It is reduced reversibly under these conditions. Alternatively, bismuth may be quantitatively adsorbed on [1-(2-pyridylazo)-2-naphthol]-naphthalene adsorbent packed in a column and determined similarly. The detection limit is 20 ppb (signal to noise ratio: 2) and the linearity is maintained in the concentration range 80±16610 4 ppb with a correlation coef®cient of 0.9994 and relative standard deviation of AE 0.96 %. Various parameters such as the effect of pH, aqueous phase volume and interference of a large number of metal ions on the determination of bismuth have been studied in detail. The method is found to be highly selective, rapid, economical and fairly sensitive and has been used for the determination of trace amount of bismuth in various complex samples.

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Section: Analysis Of Bismuth In Standard Alloysmentioning

confidence: 99%

Differential Pulse Polarographic Determination of Trace Amount of Bismuth in Various Complex Samples After Preconcentration of Its 1-(2-Pyridylazo)-2-naphthol Complex by Column and Microcrystalline Naphthalene Methods

Taher

Puri

1999

Electroanalysis

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“…In addition, it can be applied to several types of metal complexes. [3][4][5][6][7][8][9][10][11][12][13][14][15] Recently, a pre-concentration method for Zn was Separation and Preconcentration of Cadmium, Copper, Lead, Nickel and Zinc Vol. 13, No.…”

Section: Introductionmentioning

confidence: 99%

Separation and Pre-concentration of Cadmium, Copper, Lead, Nickel and Zinc by Solid-Liquid Extraction of their Cocrystallized Naphthalene Dithizone Chelate in Saline Matrices

Costa¹,

Lopes²,

Korn³

et al. 2002

J. Braz. Chem. Soc.

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Um procedimento em batelada é proposto para separação e pré-concentração de cádmio, chumbo, níquel e zinco em amostras de salmoura. O método baseia-se na adsorção dos íons metálicos sobre a fase sólida composta de ditizona co-cristalizada com naftaleno microcristalino, na faixa de pH de 8,5 -9,1. Ácido nítrico é utilizado para re-extrair os cátions da fase sólida, os quais são determinados por ICP-OES. Vários parâmetros, tais como efeito do pH, do tempo de agitação e da quantidade da fase sólida foram estudados sistematicamente visando otimizar as condições para a determinação de quantidades traço de Cd, Cu, Pb, Ni e Zn em amostras sintéticas de salmoura. Os limites de detecção obtidos, expressos em µg L -1 , foram: 44 (Zn), 11 (Ni), 30 (Cd), 47 (Pb) e 11 (Cu). A precisão do procedimento foi estabelecida pela medida de 10 replicatas com 250 µg L -1 de cada íon e os desvios padrão relativos foram de 2,71 % (Cd), 2,15 % (Cu), 1,53 % (Pb), 2,47 % (Ni) e 2,78 % (Zn). A exatidão do procedimento foi confirmada pelo método de adição de analitos e os resultados obtidos indicaram recuperação quantitativa (≥ 95 %).A procedure for separation and pre-concentration of trace amounts of cadmium, copper, lead, nickel, and zinc in brine samples has been proposed. It is based on the adsorption of metal ions onto dithizone co-crystallized with microcrystalline naphthalene, in the pH range 8.5-9.1. Nitric acid is used to back-extract the cations from the solid phase, which are measured by ICP-OES. Various parameters, such as the effect of pH, stirring time, and amounts of solid phase, have been studied in detail, to optimize the conditions for the determination of trace amounts of Cd, Cu, Pb, Ni and Zn in synthetic brine samples. The limits of detection values expressed in µg L -1 are 44 (Zn), 11 (Ni), 30 (Cd), 47 (Pb) and 11 (Cu). The precision of the procedure was determined by running 10 replicate samples, each one containing 250 µg L -1 of each element and the relative standard deviations were 2.71 % (Cd), 2.15 % (Cu), 1.53 % (Pb), 2.47 % (Ni), and 2.78 % (Zn). The accuracy of the procedure was confirmed by applying the analyte additions method and the results indicated that quantitative recoveries (≥ 95 %) were obtained.

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“…The desorption of the metal complex is carried out by the slow process of eluation, thus making the method time-consuming. The various advantages and a few disadvanatages of the methods of solid-liquid separation after liquid-liquid extraction (S) and solid-liquid separation after adsorption of metal chelates on naphthalene have already been outlined in our previous papers (9,10).…”

mentioning

confidence: 99%

Selective preconcentration of iron in beverages and water samples using 2,4,6-tri-2-pyridinyl-1,3,5-triazine-tetraphenylborate-naphthalene adsorbent

Puri¹,

Satake²,

Kano³

et al. 1987

Anal. Chem.

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A solid Ion pair material produced from 2,4,6-trl-2-pyrldlnyl-1,3,5-trlazlne-tetraphenylborate on naphthalene provides a very simple, rapid, and economical method for the preconcentration of Iron from large volumes of whisky, beer, and natural water samples. Iron Is quantitatively retained on this adsorbent In the pH range 3.3-7.0 and at a flow rate of 1-8 mL/mln. The solid mass consisting of the metal complex along with naphthalene is dissolved from the column with 5 mL of dimethylformamide (DMF). The absorbance is measured at 597 nm with a spectrophotometer against the reagent blank. Beer's law Is obeyed over the concentration range 0.2-8.0 jug of iron in 5 mL of the final DMF solution. The molar absorptivity Is 2.39 X 104 L mol"1 cm"1. Eight replicate determinations of a sample solution containing 5 jug of iron gave a mean absorbance of 0.430 with a relative standard deviation of 0.79%. The Interference of various Ions has been studied and the method has been employed to the determination of iron in standard reference material, wine, beer, whisky, brandy, tomato Juice, mixed vegetable Juice, and natural water samples.

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Preconcentration of copper in water samples with mercaptobenzothiazole on naphthalene

Cited by 25 publications

References 9 publications

Differential Pulse Polarographic Determination of Trace Amount of Bismuth in Various Complex Samples After Preconcentration of Its 1-(2-Pyridylazo)-2-naphthol Complex by Column and Microcrystalline Naphthalene Methods

Differential Pulse Polarographic Determination of Trace Amount of Bismuth in Various Complex Samples After Preconcentration of Its 1-(2-Pyridylazo)-2-naphthol Complex by Column and Microcrystalline Naphthalene Methods

Separation and Pre-concentration of Cadmium, Copper, Lead, Nickel and Zinc by Solid-Liquid Extraction of their Cocrystallized Naphthalene Dithizone Chelate in Saline Matrices

Selective preconcentration of iron in beverages and water samples using 2,4,6-tri-2-pyridinyl-1,3,5-triazine-tetraphenylborate-naphthalene adsorbent

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