E. D. Van-hullebusch, G. Guibaud, S. Simon, M. Lenz, S. S. Yekta et al., Methodological approaches for fractionation and speciation to estimate trace element bioavailability in engineered anaerobic digestion ecosystems: An overview, Crit. Rev. Environ. Sci
URL : https://hal.archives-ouvertes.fr/hal-01394597

. Technol, , vol.46, pp.1324-1366, 2016.

R. Zufiaurre, A. Olivar, P. Chamorro, C. Nerin, and A. Callizo, Speciation of metals in sewage sludge for agricultural uses, Analyst, vol.123, pp.255-259, 1998.

A. F. Braga, M. Zaiat, G. H. Silva, and F. G. Fermoso, Metal fractionation in sludge from sewage UASB treatment, J. Environ. Manage, vol.193, pp.98-107, 2017.

N. Zhu, Q. Li, X. Guo, H. Zhang, and Y. Deng, Sequential extraction of anaerobic digestate sludge for the determination of partitioning of heavy metals, Ecotoxicol. Environ. Saf, vol.102, pp.18-24, 2014.

J. R. Bacon and C. M. Davidson, Is there a future for sequential chemical extraction?, Analyst, vol.133, pp.25-46, 2008.

P. M. Thanh, B. Ketheesan, Z. Yan, and D. Stuckey, Trace metal speciation and bioavailability in anaerobic digestion: A review, Biotechnol. Adv, vol.34, pp.122-136, 2016.

H. Zhang and W. Davison, Use of diffusive gradients in thin-films for studies of chemical speciation and bioavailability, Environ. Chem, vol.12, pp.85-101, 2015.

I. Bourven, M. Casellas, R. Buzier, J. Lesieur, J. F. Lenain et al., Potential of DGT in a new fractionation approach for studying trace metal element impact on anaerobic digestion: the example of cadmium

. Biodegrad, , vol.119, pp.188-195, 2017.

M. Takashima, E. Nakakihara, and R. Ikemoto, Effects of Thermal Pretreatment and Trace Metals on High-rate Thermophilic Anaerobic Digestion of Sewage Sludge, J. Environ

. Eng, , vol.144, pp.3-6, 2018.

H. Ernstberger, H. Zhang, and W. Davison, Determination of chromium speciation in natural systems using DGT, Anal. Bioanal. Chem, vol.373, pp.873-879, 2002.

H. Zhang, W. Davison, B. Knight, and S. Mcgrath, In situ measurements of solution concentrations and fluxes of trace metals in sells using DGT, Environ. Sci. Technol, vol.32, pp.704-710, 1998.

D. Devillers, R. Buzier, S. Simon, A. Charriau, and G. Guibaud, Simultaneous measurement of Cr(III) and Cr(VI) in freshwaters with a single Diffusive Gradients in Thin Films device, Talanta, vol.154, pp.533-538, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01307118

H. Zhang and W. Davison, Diffusional characteristics of hydrogels used in DGT and DET techniques, Anal. Chim. Acta, vol.398, pp.329-340, 1999.

S. Scally, W. Davison, and H. Zhang, Diffusion coefficients of metals and metal complexes in hydrogels used in diffusive gradients in thin films, Anal. Chim. Acta, vol.558, pp.222-229, 2006.

D. Devillers, R. Buzier, A. Charriau, and G. Guibaud, Improving elution strategies for 27

-. Chelex® and . Samplers, Anal. Bioanal. Chem, vol.409, pp.7183-7189, 2017.

H. Zhang and W. Davison, Performance Characteristics of Diffusion Gradients in Thin Films for the in Situ Measurement of Trace Metals in Aqueous Solution, Anal. Chem, vol.67, pp.3391-3400, 1995.

E. W. Lemmon, M. O. Mclinden, and D. G. Friend, Thermophysical Properties of Fluid Systems, 2010.

A. H. Shiva, P. R. Teasdale, W. W. Bennett, and D. T. Welsh, A systematic determination of diffusion coefficients of trace elements in open and restricted diffusive layers used by the diffusive gradients in a thin film technique, Anal. Chim. Acta, vol.888, pp.146-154, 2015.

M. H. Tusseau-vuillemin, R. Gilbin, and M. Taillefert, A dynamic numerical model to characterize labile metal complexes collected with diffusion gradient in thin films devices, Environ. Sci. Technol, vol.37, pp.1645-1652, 2003.

S. Ding, D. Xu, Q. Sun, H. Yin, and C. Zhang, Measurement of dissolved reactive phosphorus using the diffusive gradients in thin films technique with a high-capacity binding phase, Environ. Sci. Technol, vol.44, pp.8169-8174, 2010.

W. Davison and H. Zhang, Progress in understanding the use of diffusive gradients in thin films (DGT) back to basics, Environ. Chem, vol.9, pp.1-13, 2012.

M. Jiménez-piedrahita, A. Altier, J. Cecilia, J. Puy, J. Galceran et al., Extending the Use of Diffusive Gradients in Thin Films (DGT) to Solutions Where Competition, Saturation, and Kinetic Effects Are Not Negligible, Anal. Chem, vol.89, pp.6567-6574, 2017.

P. Fletcher and P. H. Beckett, The chemistry of heavy metals in digested sewage sludge-II. Heavy metal complexation with soluble organic matter, Water Res, vol.21, pp.90167-90176, 1987.

P. L. Van-der, H. P. Veeken, and . Van-leeuwen, DGT/DET gel partition features of humic acid/metal species, Environ. Sci. Technol, vol.44, pp.5523-5527, 2010.

P. L. Van-der-veeken, P. Chakraborty, and H. P. Van-leeuwen, Accumulation of humic acid in DET/DGT gels, Environ. Sci. Technol, vol.44, pp.4253-4257, 2010.

B. Docekal, V. Rezacova-smetkova, and H. Docekalova, Effect of humic acid on metal uptake measured by diffusive gradients in thin films technique, Chem. Pap. Zvesti, vol.59, pp.298-303, 2005.

W. Davison, C. Lin, Y. Gao, and H. Zhang, Effect of Gel Interactions with Dissolved Organic Matter on DGT Measurements of Trace Metals, Aquat. Geochemistry, vol.21, pp.281-293, 2015.

E. Tampio, T. Salo, and J. Rintala, Agronomic characteristics of five different urban waste digestates, J. Environ. Manage, vol.169, pp.293-302, 2016.

C. Teglia, A. Tremier, and J. L. Martel, Characterization of solid digestates: Part 2, assessment of the quality and suitability for composting of six digested products, Waste and Biomass Valorization, vol.2, pp.113-126, 2011.