Assessment of differential-pulse adsorption voltammetry for the simultaneous determination of nickel and cobalt in biological materials

Adeloju, Samuel B O; Bond, Alan M.; Briggs, Maxine

doi:10.1016/s0003-2670(00)85630-5

Cited by 81 publications

(22 citation statements)

References 26 publications

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“…Although it has been demonstrated previously 10,14 that organic substances such as surfactants could interfere with the AdCSV responses for nickel and cobalt by competing for electrode sites on a HMDE, it was still useful to examine the extent of interference experienced with an in-situ plated mercury film. Figure 4 shows that as little as 100 µg/l of Triton X-100 was sufficient to cause a slight suppression of the cobalt peak obtained with the in-situ plated film.…”

Section: Organic and Inorganic Interferencesmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] In particular, adsorptive cathodic stripping voltammetry, which utilizes a suitable complexing agent to enhance the electrode behavior of both metals, is considered to be one of the most sensitive methods for their determination. The range of complexing agents that has been employed for this purpose includes 2,2′-bipyridine, dimethylglyoxime, 1-(2-pyridylazo)-2,7-dihydroxynaphthalene and noxime.…”

mentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10] In recent years, the use of a mercury film electrode [11][12][13][14] has been reported for either individual or simultaneous determinations of nickel and cobalt. The simultaneous determination of both metals by AdCSV on a mercury film electrode was reported by Economou et al 11 This method involves the use of an ex-situ plated mercury film for simultaneous determination of Ni and Co by square-wave adsorptive stripping voltammetry.…”

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confidence: 99%

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Simultaneous Determination of Nickel and Cobalt in Natural Water and Sediment Samples on an in-situ Plated Mercury Film Electrode by Adsorptive Cathodic Stripping Voltammetry

Adeloju

Hadjichari

1999

ANAL. SCI.

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Section: Organic and Inorganic Interferencesmentioning

confidence: 99%

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confidence: 99%

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Simultaneous Determination of Nickel and Cobalt in Natural Water and Sediment Samples on an in-situ Plated Mercury Film Electrode by Adsorptive Cathodic Stripping Voltammetry

Adeloju

Hadjichari

1999

ANAL. SCI.

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“…The procedure involves adsorption of nickel and cobalt onto the HMDE as dimethylglyoximates (pH = 9.3) followed by a cathodic scan. Dimethylglyoxime (DMG) is the complexing agent of choice allowing very low detection of Ni 2+ (1 µg.L -1 ) and Co 2+ (0.4 µg.L -1 ) in the polarographic cell [5][6]. 100 µL of soil sample is diluted in 7 mL of NH 3 /NH 4 Cl 1 M and 70 µL of DMG 0.1 M. The DMG solution is prepared daily by dissolution in ethanol.…”

Section: Voltammetry: Anodic Stripping Voltammetry (Asv) and Adsorptimentioning

confidence: 99%

Ion chromatographic and voltammetric determination of heavy metals in soils. Comparison with atomic emission spectroscopy

et al. 1999

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It is widely known that the analysis of trace elements is tricky and that the results obtained often vary according to the analytical technique chosen.The aim of this paper is to compare different analytical techniques, a spectroscopic, an electrochemical and a chromatographic one to determine total heavy metals concentrations in soils and to establish a correlation between these three techniques even though soil solutions are complex matrices providing a lot of interference problems.Atomic emission spectroscopy is the method of reference for heavy metals concentrations analysis. This analytical technique is employed for multi-element analysis and is suitable for a routine measuring out [1]. Polarographic methods are commonly used because of their very low detection limits but still, they are time consuming. Ion chromatographic techniques are generally described in the literature for heavy metals analysis in simple matrix like water but no papers were found for complex matrices like soils or sediments.The first part of this paper presents the apparatus used and the analytical reagents. The second section describes the experimental results obtained with ion chromatography, anodic stripping voltammetry and atomic emission spectroscopy. The last section presents a discussion and a comparison of the results obtained with the different methods for each heavy metal studied. Materials and methods Ion ChromatographyThe measurements are carried out on a DIONEX DX 500 system which is composed of a peristaltic pump GP 40, a pre column CG5A, a CS5A column and a UV-Visible detector AD20. The CS5A column is compatible with pH 0 to 14, allowing the analysis of acid digested soil solutions. Two different Dionex eluents are used, the Met Pac PDCA and the Met Pac Oxalic Acid. The first one is a pyridine-2,6 dicarboxylic acid (PDCA) eluent which is a strong complexing agent that separates the metal ion complexes by anion exchange. The second one is an oxalic acid eluent which is a moderate strength complexing agent that separates the metals by a mixed mode mechanism, anion exchange for metals complexed with oxalic acid and cation exchange for free metals. The detection is accomplished by visible absorbance after post column complexation between heavy metals and a post column reagent. The post column reagent is prepared with 30 mg of 4- (2pyridylazo) Abstract. This work deals with the comparison between three analytical techniques for the total contents analysis of heavy metals in agricultural soils polluted by copper. The soils samples are digested to clear solutions using a mixture of perchloric and hydrofluoric acids. The metals studied are copper, lead, cadmium, nickel, cobalt, zinc and manganese. Soil solutions are complex matrices and the analytical techniques investigated are ion chromatography (IC), Anodic Stripping Voltammetry (ASV) or Adsorptive Stripping Voltammetry (AdSV) and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), or graphite furnace atomic absorption spectroscopy (AAS). The use of ion chroma...

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“…The possibility has been recognized and it has been indicated that trace Co(I1) in seawater can be determined although details, procedure or results were not given (3). Methods for trace Co(I1) in biological materials (6)(7)(8)(9), sediments (8), reactor water coolant (lo), rain water ( l l ) , and estuarine and fresh water samples containing elevated Co levels (1 2) have been described. Each of the methods involves the accumulation of the Ni(DMG), and CO(DMG)~ complexes at a Hg electrode followed by a voltammetric determination of the adsorbed species.…”

Section: Introductionmentioning

confidence: 99%

The voltammetric determination of cobalt(II) in seawater – adsorptive preconcentration of the dimethylglyoxime complex

Westenbrink¹,

Page²,

vanLoon³

1990

Can. J. Chem.

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. Conditions for the determination of trace Co in seawater are described. The method involves formation of the dimethylglyoxime complex and adsorptive accumulation onto a hanging mercury drop electrode at an applied potential of -0.70 or -0.96 V vs. SCE. The adsorbed complex is then reduced by scanning the electrode potential to -1.20 V; the reduction peak potential (E,) is -1.12 V. Nickel behaves in a similar manner with E, of -0.99 V but the Co complex appears to be preferentially adsorbed, making analysis for Co possible even in the presence of a large excess of Ni. Adsorption of organic matter also occurs; this does not affect analytical sensitivity but limits the maximum deposition time allowed in the analysis.Determination of Co in six seawater samples yielded results ranging from 4 to 114 ng L-'. Good agreement was obtained with the one reference sample (NASS-1) for which there was a certificate value. On d6crit des conditions permettant de determiner des traces de Co dans l'eaud e mer. La rn6thode implique la formation du complexe avec la dimCthylglyoxime et une accumulation par adsorption sur une Clectrode i goutte de mercure pendante, i un potentiel appliquC de -0,70 ou-0,96 V vs. SCE. Le complexe adsorb6 est alors r6duit en balayant le potentiel de l'klectrode jusqu'i -1,20 V; le potentiel maximal de la rCduction (E,) se situe i -1,12 V. Le nickel se cornporte d'une manikre semblable avec un E, de -0,99 V; toutefois, le complexe de Co semble &tre adsorb6 d'une f a~o n pr6f6rentielle et cette propriCtC permet d'analyser le Co m&me en presence d'un large excks de Ni. I1 se produit aussi une adsorption des composCs organiques; cette propriCtC n'affecte pas la sensibilitC analytique mais elle limite le temps maximal de dkposition permis par l'analyse.La dktermination du Co dans six Cchantillons d'eau de mer a fourni des r6sultats allant de 4 i 114 ng L-'. On a obtenu une bonne corrklation avec le seul Cchantillon de reference (NASS-1) pour lequel il existe une valeur certifiie.

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Assessment of differential-pulse adsorption voltammetry for the simultaneous determination of nickel and cobalt in biological materials

Cited by 81 publications

References 26 publications

Simultaneous Determination of Nickel and Cobalt in Natural Water and Sediment Samples on an in-situ Plated Mercury Film Electrode by Adsorptive Cathodic Stripping Voltammetry

Simultaneous Determination of Nickel and Cobalt in Natural Water and Sediment Samples on an in-situ Plated Mercury Film Electrode by Adsorptive Cathodic Stripping Voltammetry

Ion chromatographic and voltammetric determination of heavy metals in soils. Comparison with atomic emission spectroscopy

The voltammetric determination of cobalt(II) in seawater – adsorptive preconcentration of the dimethylglyoxime complex

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