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1.
J Hazard Mater ; 262: 357-64, 2013 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-24056248

RESUMEN

Past applications of chlordecone, a persistent organochlorine pesticide, have resulted in diffuse pollution of agricultural soils, and these have become sources of contamination of cultivated crops as well as terrestrial and marine ecosystems. Chlordecone is a very stable and recalcitrant molecule, mainly present in the solid phase, and has a strong affinity for organic matter. To prevent consumer and ecosystem exposure, factors that influence chlordecone migration in the environment need to be evaluated. In this study, we measured the impact of incorporating compost on chlordecone sequestration in andosols as a possible way to reduce plant contamination. We first characterized the transfer of chlordecone from soil to plants (radish, cucumber, and lettuce). Two months after incorporation of the compost, soil-plant transfers were reduced by a factor of 1.9-15 depending on the crop. Our results showed that adding compost modified the fractal microstructure of allophane clays thus favoring chlordecone retention in andosols. The complex structure of allophane and the associated low accessibility are important characteristics governing the fate of chlordecone. These results support our proposal for an alternative strategy that is quite the opposite of total soil decontamination: chlordecone sequestration.


Asunto(s)
Clordecona/aislamiento & purificación , Sustancias Húmicas , Plaguicidas/aislamiento & purificación , Contaminantes del Suelo/aislamiento & purificación , Suelo/química , Difracción de Rayos X
2.
Eur Phys J E Soft Matter ; 12 Suppl 1: S13-6, 2003 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-15011006

RESUMEN

Solid polymorphism of 4-alkyl-4'-cyanobiphenyl (nCB) was studied so far as a function of thermal history. In this paper we show that metastable solid phases of 4-octyl-4'-cyanobiphenyl (8CB) are also formed when the mesogens are confined in porous silica matrices and we study their structure by neutron diffraction and by Raman spectroscopy. Three metastable solid states are identified: one crystalline phase K', two frozen-in smectic-like phases K(s) and K'(s). We discuss the relation between the structure of the metastable solid phases and that of the mesomorph phases.

3.
Phys Rev Lett ; 71(20): 3307-3310, 1993 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-10054940
4.
Phys Rev B Condens Matter ; 39(10): 7384-7387, 1989 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-9947417
5.
Phys Rev B Condens Matter ; 37(11): 6500-6503, 1988 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-9943900
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