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Grain-size partitioning of butyltins in estuarine and coastal sediments 5
Quevauviller, P; Etcheber, H; Raoux, C; Donard, O.
Grain-size partitioning of tributyltin (TBT) and its degradation products di- and monobutyltin (DBT and MBT) in coastal sediments revealed a strong tendency on the part of these compounds to adsorb on to detrital fragments (algal and leaf debris mixed with light mineral particles). Butyltins have been weakly detected in sands washed from these debris, a finding which underlined the need to separate both fractions (sands and debris) for an accurate assessment of the grain size partitioning. In debris-free sediments, butyltins were mostly detected in the silt/clay fraction. It was found necessary to consider the total amount of butyltins in each fraction, and hence the relative proportion of each fraction, in order accurately to assess the grain-size...
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00267/37873/35954.pdf
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Improved procedures for extraction of water-extractable carbohydrates from particulate organic matter 5
Burdloff, D; Etcheber, H; Buscail, R.
The present work presents improvements to the existing methods for extraction of carbohydrates with water. In order to test the effects of extraction factors on the yield of carbohydrates, extractions of water-soluble carbohydrates were performed with two contrasting samples (suspended particulate organic matter from the high turbidity zone of the Gironde estuary and sedimentary organic matter from the Arcachon lagoon) under different experimental conditions. Results show that: (i) boiling water applied for 30 min yielded the best result for water-soluble carbohydrates in both samples; (ii) sonic disruption had a strong influence on the recovery rate of water-soluble carbohydrates - a steady yield was reached after a 3-min treatment; (iii) almost all the...
Tipo: Text Palavras-chave: Facteurs d’extraction; Matière organique particulaire; Sucres solubles; Extraction factors; Particulate organic matter; Water-soluble carbohydrates.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43347/42879.pdf
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L'expérience "double marquage de vase en Gironde". Contribution à la connaissance du devenir d'une pollution métallique en estuaire 5
Etcheber, H; Jouanneau, Jm; Latouche, C; Azoeuf, P; Caillot, A; Hoslin, R.
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Ano: 1980 URL: http://archimer.ifremer.fr/doc/00122/23292/21120.pdf
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Response of biota to sedimentary organic-matter quality of the west gironde mud patch, bay of biscay (france) 5
Relexans, Jc; Lin, Rg; Castel, J; Etcheber, H; Laborde, P.
Relationships between benthos and sedimentary organic matter quality were analyzed in the West Gironde Mud Patch (WGMP), on the shelf of the Bay of Biscay, off the Gironde estuary, as part of the multidisciplinary national programme Ecomarge, a JGOFS-France contribution. At three stations located on an east-west transect and at different periods from 1985 to 1988, the following parameters of the sediment were analyzed: POC (particulate organic carbon); SIGMA (sum of easily extractable macromolecules thought to be the most degradable part of particulate organic matter); pigments as indices of organic matter quality; ETS (electron-transport-system) activities and meiofauna densities as indices of benthic responses. Sediments from the WGMP have an overall low...
Tipo: Text Palavras-chave: BENTHOS; ELECTRON-TRANSPORT-SYSTEM (ETS); MEIOFAUNA; POC QUALITY; ORGANIC MATTER.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00101/21231/18848.pdf
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