Assessment of the DGT technique in digestate to fraction twelve trace elements

TALANTA

卷:192

Article

Laera, Andreina^1,2,3  Buzier, Remy²  Guibaud, Gilles²  Esposito, Giovanni³  van Hullebusch, Eric D.^1,4 

[1] Univ Paris Est, UPEM, Lab Geomat & Environm, EA 4508, F-77454 Marne La Vallee, France

[2] Univ Limoges, PEIRENE, Equipe Dev Indicateurs Previs Qual Eaux, URA IRSTEA, 123 Ave Albert Thomas, F-87060 Limoges, France

[3] Univ Cassino & Southern Lazio, Dept Civil & Mech Engn, Via Gaetano di Biasio 43, I-03043 Cassino, FR, Italy

[4] IHE Delft Inst Water Educ, Dept Environm Engn & Water Technol, POB 3015, NL-2601 DA Delft, Netherlands

关键词: Digested sewage sludge;    Passive sampling;    Matrix interferences;    Metals;    Metalloids;    Speciation;   

DOI  :  10.1016/j.talanta.2018.09.033

来源: Elsevier

【 摘 要 】

This study proposes an evaluation of the diffusive gradients in thin films technique (DGT) for studying trace elements in digested sewage sludge samples. Twelve elements were monitored by Chelex (Al, Cd, Co, Cr (III), Cu, Fe, Mn, Ni, Pb) and zirconia-DGT (As, Mo, Se) samplers exposed from 4 h to 9 days. Twenty-four hours' deployment time was suitable for most of the studied elements. However, short deployment led to insufficient element accumulation or non-establishment of steady state while long deployment (from 18 to 144 h depending on the element) led to saturation of the binding gels and/or competing effects with other major elements. In addition, this study showed that the matrix of the digested sewage sludge lowers the accumulation of some trace elements in the DGT samplers, leading to labile concentrations underestimation of roughly 10-30% (depending on the element). Moreover, compared to the conventional total dissolved elements measurement, DGT technique allowed to quantify 7 out of 12 labile elements whereas only 3 out of 12 dissolved elements were quantified. These results highlight the potential of DGT technique to assess labile trace elements in digestate samples, provided a careful adaptation of the deployment time as well as an evaluation of the matrix effect is performed.

【 授权许可】

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