Ion-selective electrode measurements of copper(II) activity in contaminated soils

Sauvé, Sébastien; McBride, Murray B.; Hendershot, William H.

doi:10.1007/bf00212503

Cited by 77 publications

(47 citation statements)

References 33 publications

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“…The second study was undertaken using only lettuce with five new soils, but expanding the chemical analyses by exploring the effectiveness of a variety of conventional extractants as well as chelator-bound anion exchange membranes (AEM) (Tambasco 1998). The soil characterization was complemented with electrochemical speciation of free metal species in the soil solutions (Sauvé et al 1995;). …”

Section: Methodsmentioning

confidence: 99%

Phytoavailability of Cu and Zn to lettuce (Lactuca sativa) in contaminated urban soils

Tambasco¹,

Sauvé²,

Cook³

et al. 2000

Can. J. Soil. Sci.

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. Phytoavailability of Cu and Zn to lettuce (Lactuca sativa) in contaminated urban soils. Can. J. Soil Sci. 80: 309-317. This study compares the effectiveness of several chemical evaluation procedures to predict Cu, and Zn concentrations in lettuce (Lactuca sativa 'Buttercrunch') grown on contaminated soils from the Montreal urban area. The plant growth assays were performed in the greenhouse using field-collected, non-spiked soils. The soils were characterized using several chemical extraction reagents, as well as electrochemical speciation of the soil solution free metal species. The chemical characterization was supplemented with labile metal pool determinations using anion exchange membranes treated with DTPA or EDTA. The results show that the more sophisticated electrochemical speciation and exchange resins procedures did not consistently improve predictions of metal uptake. We believe this is due to the minimization of metal solubility caused by the circumneutral or alkaline pH values and the relative homogeneity of the relatively small urban soil sample set that we used. The metal solubility and bioavailability in the soils tested were minimized by the particular chemical properties of the soils, obscuring any potential advantages from more discriminate soil chemical evaluation procedures. Nevertheless, the reported regressions (for 10 different methods) are valid estimates of Cu and Zn phytoavailability in contaminated urban soils. Buttercrunch) cultivés dans des sols pollués de la région urbaine de Montréal. Les tests de croissance étaient réalisés sous serre dans des sols prélevés sur le terrain et utilisés tels quels. Les sols étaient caractérisés au moyen de plusieurs extractants chimiques ainsi que par spéciation électrochimique des espèces de métaux libres présents dans la solution du sol. La caractérisation chimique était complétée par la détermination des pools de métaux labiles au moyen de membranes d'échange anionique traitées au DTPA ou au EDTA. Il ressort des résultats obtenus que les méthodes plus sophistiquées de la spéciation électrochimique et des résines d'échange ne produisaient pas toujours de meilleures prédictions de l'absorption de métaux. Cela, à notre avis, tiendrait à l'extrême réduction de la solubilité des métaux causée par les valeurs de pH alcalines ou voisines de la neutralité ainsi que par la relative homogénéité de l'échantillon assez restreint de sols urbains utilisés. La solubilité et la biodisponibilité des métaux dans les sols étudiés étaient réduites au minimum par les propriétés chimiques particulières des sols, masquant tout avantage éventuel de techniques d'évaluation chimique plus sensibles. Néanmoins, les coefficients de régression obtenus pour dix méthodes différentes constituent des estiméess valides de la phytodisponibilité de Cu et de Zn dans ces sols urbains pollués. Mots clés:Laitue, oligo-éléments métalliques, biodisponibilité, spéciation chimique, membrane d'échange ionique, sol pollué, ions libresMetal contamination is usually assessed using total soil m...

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Section: Methodsmentioning

confidence: 99%

Phytoavailability of Cu and Zn to lettuce (Lactuca sativa) in contaminated urban soils

Tambasco¹,

Sauvé²,

Cook³

et al. 2000

Can. J. Soil. Sci.

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“…, is slight, 31 and although the Cu ISE is sensitive to both Cu + and Cu 2+ ions, the Cu + activity under aerobic conditions is a number of log units lower than that of Cu 2+ ions (Visual MINTEQ). In the present study, the test soils were regularly aerated and mixed to reduce the occurrence of anaerobic sites.…”

Section: +mentioning

confidence: 99%

Differences in Soil Solution Chemistry between Soils Amended with Nanosized CuO or Cu Reference Materials: Implications for Nanotoxicity Tests

McShane

Sunahara

Whalen

et al. 2014

Environ. Sci. Technol.

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/es500141hEnvironmental Science and Technology, 48, 14, pp. 8135-8142, 2014-06-10 ABSTRACT: Soil toxicity tests for metal oxide nanoparticles often include micrometer-sized oxide and metal salt treatments to distinguish between toxicity from nanometer-sized particles, non-nanometer-sized particles, and dissolved ions. Test result will be confounded if each chemical form has different effects on soil solution chemistry. We report on changes in soil solution chemistry over 56 daysthe duration of some standard soil toxicity testsin three soils amended with 500 mg/kg Cu as nanometer-sized CuO (nano), micrometer-sized CuO (micrometer), or Cu(NO 3 ) 2 (salt). In the CuO-amended soils, the log Cu 2+ activity was initially low (minimum −9.48) and increased with time (maximum −5.20), whereas in the salt-amended soils it was initially high (maximum −4.80) and decreased with time (minimum −6.10). The Cu 2+ activity in the nano-amended soils was higher than in the micrometer-amended soils for at least the first 11 days, and lower than in the saltamended soils for at least 28 d. The pH, and dissolved Ca and Mg concentrations in the CuO-amended soils were similar, but the salt-amended soils had lower pH for at least 14 d, and higher Ca and Mg concentrations throughout the test. Soil pretreatments such as leaching and aging prior to toxicity tests are suggested.

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“…Different calibration schemes and regressions could be realised with different Cu buffers but the end result is identical. [22,24] Equilibration of the buffer solutions Fig. 2 reports the evolution of the potential of the ISE as a function of pH for two buffer solutions of different initial pH.…”

Section: Electrode Calibrationmentioning

confidence: 99%

“…The most often used are pH potentiometry, [6] cation-exchange resins, [7][8][9] charge separation (Donnan membrane), [10,11] anodic stripping voltammetry, [7,[12][13][14][15][16][17][18][19] diffusive gradients in thin films measurements [18] and cupric ion-selective electrodes (ISE). [3,14,15,[18][19][20][21][22][23][24][25] All these techniques have some advantages and disadvantages and none can be considered universal.…”

Section: Introductionmentioning

confidence: 99%

Use of an ion-selective electrode for free copper measurements in low salinity and low ionic strength matrices

2007

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Environmental context. The toxicity of metals in the environment is controlled by several parameters including total metal concentration, pH and organic and inorganic ligands (type and concentration). The characterisation of different metal pools in natural matrices (e.g. seawater, soil) is important for the evaluation of their toxic impact. The copper ion-selective electrode (Cu-ISE) is a method of choice for the analytical determination of the speciation (i.e. chemical forms) of divalent copper in natural matrices. This paper clarifies several operational parameters in the hope of decreasing variability of results and increasing the application domain of the Cu-ISE.Abstract. The determination of free copper concentrations in natural matrices is critical for the evaluation of copper toxicity. The ISE is one of the few analytical means for determining the direct speciation of free metal species. We have refined the method for low salinity and low ionic strength solutions for application with soil water extracts or fresh waters. Moreover, we have detailed and standardised a method for using a Cu-ISE with an autotitrator. The standardisation shows a good response and allows significant time saving (under 2 h for the calibration). The results obtained using the ISE are compared with those predicted in the presence of different organic ligands or even the lower free Cu 2+ activities resulting from the formation of Cu hydroxyl species. The method was validated for the determination of Cu speciation at environmentally relevant free Cu 2+ activity, i.e. ranging between 10 −14 and 10 −4 M. The chemical equilibrium calculations were made using the MINEQL+ software and the results agree well for pH values between 3 and 10. In terms of precision, the standard deviations of the measured values never exceed 0.1 units, and in terms of accuracy, the measured values were very close to the nominal values, within a range of 0.1. Outside the optimal pH range, the electrode yields higher activity than expected.

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Ion-selective electrode measurements of copper(II) activity in contaminated soils

Cited by 77 publications

References 33 publications

Phytoavailability of Cu and Zn to lettuce (Lactuca sativa) in contaminated urban soils

Phytoavailability of Cu and Zn to lettuce (Lactuca sativa) in contaminated urban soils

Differences in Soil Solution Chemistry between Soils Amended with Nanosized CuO or Cu Reference Materials: Implications for Nanotoxicity Tests

Use of an ion-selective electrode for free copper measurements in low salinity and low ionic strength matrices

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