Methodologies for Soil and Sediment Fractionation Studies by Philippe Quevauviller, A Sahuquillo, J F Lopez-Sanchez,

By Philippe Quevauviller, A Sahuquillo, J F Lopez-Sanchez, Christine Gleyzes, Veronique Ruban, R Comans, Gemma Rauret, A Ure, A Gomez, E Barahona, H Muntau, S Tellier, Michel Astruc, Hans Sloot

Offers particularly with operationally-defined extraction equipment for the choice of 'fractions' of parts in soil and sediment matrices. provides a precis of the newest study on extraction/leaching exams for the selection of hint natural compounds in wastes.

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Cireddu, S. Fadda, M. M. G. Manca, 0. Masala, A. Marcello and S. Pretti, VIII Congreso Geologico Chileno, 1997, Actas 1,675. 74. F. Serano, A. Sahuquillo, M. Bianchi and H. Muntau, European Commission, Joint Research Center, 2000, Euro Report EUR 19625 IT. F. LOPEZ-SANCHEZ, A. SAHUQUILLO, G. RAURET, M. LACHICA,' E. BARAHONA,' A. M. URE, H. MUNTAU A N D PH. 1 Introduction Trace elements in soils appear in different chemical forms or ways of binding. In unpolluted soils, trace elements exist mainly as relatively immobile species in silicates,aluminates and other primary minerals but as a result of weathering the trace element content is gradually mobilised to forms available to plants.

The procedure for soil extraction prescribed the use of an end-over-end mechanical shaker but, to determine the extent to which the type of shaker affected the extractable concentrations, laboratories were invited to repeat their extractions and analyses with any other type of shaker available. In this instance analysis of triplicate extractions were considered to be sufficient. The type of shaker, its speed of oscillation or rotation and the temperature of the extract in the extracting vessel at the end of the extraction period were requested to be reported.

Muntau and B. Griepink, Report EUR 14763 EN, 1993. 10. T. Chao, J. Geochem. , 1984,20,101. 11. K. Das, R. L. Cervera and M. de la Guardia, Talanta, 1995,42, 1007. 12. A. C. Campbell and M. Bisson, Anal. , 1979,51,844. 13. A. C. Bisson, J. Geochem. , 1982,16,7,7. 14. A. Tessier, F. Rapin and R. Carignan, Geochimica et Cosmochimica Acta, 1985,49, 183. 15. J . W. Huang and Q. Wang, Chemical Geology, 1994,112,275. 16. F. Lopez-Sanchez, R. Rubio, C. Samitier and G. Rauret, Wat. , 1996,30, 153. 17. J.

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