Electroanalysis at modified carbon-paste electrodes containing natural ionic polysaccharides

Wang, Joseph; Taha, Ziad; Naser, Najih

doi:10.1016/0039-9140(91)80012-o

Cited by 25 publications

(17 citation statements)

References 14 publications

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“…Since their emergence in the mid-1970s [19], great advances have been made in this area. Their applications in analytical chemistry are electrocatalysis, selective preconcentration, membrane barriers (permselectivity) and potentiometric response [15,16,18,20,21]. CMCPEs used to measure copper ions have been reported too, but these analyses are usually based on selective preconcentration [22 ± 25] rather than on potentiometric measurements [26,27].…”

Section: Introductionmentioning

confidence: 99%

Copper(II) Ion‐Selective Electrodes Based on Dithiosalicylic and Thiosalicylic Acids

et al. 2003

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Potentiometric carbon paste electrodes for copper(II) based on dithiosalicylic and thiosalicylic acids are described. The sensor based on dithiosalicylic acid (DTS) exhibits a linear response with a nearly Nernstian slope of 27.7 mV per decade, whereas the electrode based on thiosalicylic acid (TS) shows a super-Nernstian slope. The limits of detection for the DTS sensor and the TS sensor are 10 À 7.9 and 10 À 6.3 M for copper(II) activity, respectively. Selectivity coefficients are tabulated, and the influence of the pH on the response of these ISEs is studied. The DTS electrode is successfully used for potentiometric titration of humic acids with copper in order to get more information about complexing properties of these acids.

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Section: Introductionmentioning

confidence: 99%

Copper(II) Ion‐Selective Electrodes Based on Dithiosalicylic and Thiosalicylic Acids

et al. 2003

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“…[10][11][12] In recent years, various chemically modified electrodes have been used to determine copper. Many substances, such as alga, 10 N-phenylcinnamohydroxamix acid, 11 N-acetyl-1-cysteine, 12 10-phenan-throline, 13 cysteine, 14 natural ionic polysaccharides, 15 Sphagnum peat moss, 16 1,2-bis-methyl(2-aminocyclopentene-carbodithioate)ethane, 17 salicylidenea-mino-2-thiophenol, 18 diquinolyl-8,8′-disulfide, 19 polypyrrolepyrocatechol violet, 20 N-(2-hydroxybenzyl)chitosan 21 and tetraphenylporphyrin, 22 have been used to fabricate the CME for the determination of copper. However, most of these modifiers were used to produce chemically modified carbon paste electrodes (MCPE).…”

Section: Introductionmentioning

confidence: 99%

Differential Pulse Anodic Stripping Voltammetric Determination of Traces of Copper with a Tobramycin-Nafion Modified Electrode

Li¹,

Luo²,

Chen

2004

ANAL. SCI.

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“…In addition, polysaccharide components like cellulose can also served as binding sites of metals by different mechanisms. One polymeric carbohydrate, alginic acid, was found to bind with lead ions by ion exchange mechanism (Wang et al 1991). It is also possible that the hydroxyl group and the carbonyl groups in the plant refuses are the main binding sites for heavy metals.…”

Section: Utilization Of Plant Refuses As Component… Elmer-rico E Mojmentioning

confidence: 99%

Utilization of Plant Refuses as Component of Heavy Metal Ion Sensors in Water Samples

Mojica¹,

Micor²

2010

Journal of Applied Sciences and Environmental Management

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Waste materials like fruit and vegetable refuses were utilized as component of sensors capable of detecting heavy metals like lead ions and mercury ions by electrochemical method. The ability of the fabricated sensors to detect the presence of heavy metals was analyzed using electrochemical methods like cyclic voltammetry and differential pulse anodic stripping voltammetry. Results showed that the fabricated electrode were able to detect the presence of mercury and lead ions in aqueous solutions. @JASEM Several heavy metals coming mostly from mining wastes and industrial discharges have been found to contaminate our natural waters (Schalcsha et al., 1998). Both the chemically combined forms as well as the elemental form of these metals are toxic (Manahan, 1993). Acute lead, mercury, cadmium, chromium, and copper poisoning in humans causes severe dysfunction in the renal, reproductive, and nervous systems (Berman, 1980). In addition, chronic exposure to these contaminants present even at low concentrations in the environment can prove to be harmful to the human health (Wyatt et al., 1998).There are several methods used to detect these metals, of which atomic absorption spectrometry (AAS) is the most popular. However, the cost of analysis, the unavailability of equipment, maintenance, sample pre-treatment and large concentrations of solutions limit their application. An alternative method for the detection of these metals is the use of chemically modified carbon paste electrodes (CMCPE). The CMCPE are a class of metal sensors which are relatively easy to prepare and gives a stable response. The concept of chemically modified carbon paste electrodes was a product out of the desire to manipulate the chemical nature of the electrode surface by incorporating a modifying agent. Through this, the electrode assumes the desirable properties of the modifier in binding metals wherein enhanced selectivity, sensitivity and over-all stability is achieved. The discovery of metal hyper-accumulating properties in certain plants made way for the potential of using plant based system for treatment of wastes containing metals (Ensley, 2000). It has been shown that some plant species have the ability to accumulate elevated amounts of toxic heavy metals (Blaylock and Huang, 2000;Reeves and Baker, 2000). Some varieties of Thlaspi and ecotypes of Silene vulgaris have been found to accumulate cadmium (Ernst et al., 2000;Brown et al., 1994). Larrea tridentata, a desert inhabitant shrub (creosote bush) accumulates copper (Gardea-Torredey 2001) and species of alfalfa plants (Medicago sativa L.) and Euryale ferox Salisb. accumulates cadmium, chromium, and copper (Rai et al., 2002; Peralta et al., 2001; Peralta-Videa et al., 2002). The use of plant refuses as modifiers in CMCPE is due to the fact that they possess an electrochemically or chemically active moiety. These moieties could be any of the following: redox or ligand sites, ionexchange sites, enzyme active sites; all of which possesses certain functionalities or donor groups...

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Electroanalysis at modified carbon-paste electrodes containing natural ionic polysaccharides

Cited by 25 publications

References 14 publications

Copper(II) Ion‐Selective Electrodes Based on Dithiosalicylic and Thiosalicylic Acids

Copper(II) Ion‐Selective Electrodes Based on Dithiosalicylic and Thiosalicylic Acids

Differential Pulse Anodic Stripping Voltammetric Determination of Traces of Copper with a Tobramycin-Nafion Modified Electrode

Utilization of Plant Refuses as Component of Heavy Metal Ion Sensors in Water Samples

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