Use of the diffusive gradients in thin films technique to evaluate (bio)available trace metal concentrations in river water.

Institute of Chemistry and Technology of Environmental Protection, Brno University of Technology, Faculty of Chemistry, Purkynova 118, 61200, Brno, Czech Republic.
Analytical and Bioanalytical Chemistry (Impact Factor: 3.58). 04/2007; 387(6):2239-44. DOI: 10.1007/s00216-006-0996-y
Source: PubMed

ABSTRACT Concentrations of Cd, Cu, Cr, Pb, Ni and Zn were monitored in the Svitava River (the Czech Republic) during April and September 2005. Total concentrations and total dissolved concentrations were obtained through regular water sampling, and the diffusive gradients in thin films technique (DGT) were used to gain information on the kinetically labile metal concentrations. Each measured concentration was compared with the corresponding average (bio)available concentration calculated from the mass of metal accumulated by the moss species Fontinalis antipyretica. The concentrations of Cd, Pb, Cr and Zn measured using DGT corresponded well with those obtained after the deployment of Fontinalis antipyretica moss bags in the Svitava River, but the concentrations of Cu and Ni did not. The calculated (bio)available Cu concentration correlated well with the total dissolved concentration of Cu, whereas no correlation was found to exist between the concentrations of Ni.

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    ABSTRACT: The aim of this study was to assess cadmium and copper uptake by radish (Raphanus sativus) and to test the capability of the diffusive gradient in thin films (DGT) technique to predict bioaccessibility of the metals for this plant. Radish plants were grown in pots filled with uncontaminated control and artificially contaminated soils differing in cadmium and copper contents. Metal concentrations in plants were compared with free ion metal concentrations in soil solution, and concentrations measured by DGT. Significant correlation was found between metal fluxes to plant and metal fluxes into DGT. Pearson correlation coefficient for cadmium was 0.994 and for copper 0.998. The obtained results showed that DGT offers the possibility of simple test procedure for soils and can be used as a physical surrogate for plant uptake.
    Talanta 11/2014; 134C. DOI:10.1016/j.talanta.2014.11.014 · 3.51 Impact Factor
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    ABSTRACT: In this work, a device based on diffusive gradients in thin films (DGT) was evaluated for the determination of Hg(II) in river water. The DGT device was assembled with a cellulose phosphate ion exchange membrane (P81 Whatman) as a binding phase and agarose gel 1.5% (m/v) as a diffusive layer. Laboratory deployments showed that the binding of Hg(2+) ([HgDGT]/[Hgsolution]) by P81 membrane was more effective (97%) than the Chelex 100 resin (80%).The effect of ionic strength, pH and potential interfering ions on Hg binding with DGT׳s was investigated. The results showed no significant effect on the binding of Hg(II) at pH range from 3.5 to 8.5 and at an ionic strength range from 0.0005 to 0.1molL(-1). Uptakes of 50µgL(-1) Hg(II) by P81 membrane were not affected by Fe, Mn, Zn, Cu, Ca and Mg at the concentration range of 200-1800µgL(-1). Finally, the DGT device using the P81 as the binding layer was applied for in situ measurements of Hg in river water. For in situ measurements, the labile Hg concentration (from <2 to 13ngL(-1)) was lower than 10% of the dissolved fraction (from 155 to 446ngL(-1)).
    Talanta 05/2014; 129C. DOI:10.1016/j.talanta.2014.05.025 · 3.51 Impact Factor
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    ABSTRACT: In this study, a method is proposed for the selective retention of As(v) using diffusive gradient in thin film (DGT) samplers containing a strongly basic anion exchange resin (Amberlite IRA 910) supported on a polyacrylamide gel. In addition, the total arsenic content is determined by ferrihydrite gel discs. Subsequently, the concentration of As(iii) was obtained by determining the difference between the total As and As(v). DGT experiments showed linear accumulation of As(v) (up to 280 ng) until a deployment time of 8 h deployment (R(2) > 0.99). The retention of As(v) was appropriate (97.9-112.3%) between pH 5 and 9. For a solution with an ionic strength ranging from 0.001 to 0.05 mol L(-1), the As(v) uptake ranged from 90-120%. The proposed method was applied for the speciation of arsenic in river water. For the analysis of spiked samples collected at the Furnas stream, the recoveries of total arsenic content ranged between 103.9% and 118.8%. However, the recoveries of As(iii) and As(v) were 43.3-75.2% and 147.3-153.4%, respectively. These differences were probably because of the oxidation of As(iii) to As(v) during deployments. For spiked samples collected at the Ribeirão Claro, the recoveries of dissolved As(iii), As(v) and As(T) were 103.1%, 108.0% and 106.3%, respectively. Thus, the DGT technique with Amberlite IRA 910 resin as the binding phase can be employed for the in situ redox speciation of inorganic arsenic.
    The Analyst 07/2014; 139(17). DOI:10.1039/c4an00555d · 3.91 Impact Factor

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