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Retardation of organic contaminants in natural fractures in chalk
Year:
2002
Source of publication :
Ground Water
Authors :
Graber, Ellen
;
.
Volume :
40
Co-Authors:
Wefer-Roehl, A., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Adar, E., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Yakirevich, A., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Ronen, Z., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Facilitators :
From page:
291
To page:
301
(
Total pages:
11
)
Abstract:
Transport of a conservative compound and two sorbing compounds through fractured chalk was studied using flow-through columns consisting of chalk cores with a single subvertical fracture. Two types of chalk matrix were compared, an oxidized white chalk with low organic carbon content (0.2%), and a gray chalk with a higher organic carbon content (1.3%). Initial rapid breakthrough followed by a delayed approach to a relative concentration of unity for the conservative compound (2,6-difluorobenzoic acid [DFBA]) was clear evidence for diffusion into the porous chalk matrix. Matrix diffusion of DFBA was apparently much greater in the gray chalk columns than in the white chalk columns. Breakthrough curves (BTCs) of the sorbing compounds (2,4,6-tribromophenol [TBP] and ametryn [AME]) were retarded in all cases as compared to the conservative compound. Sorption retardation was far greater in the gray chalk as compared with the white chalk, in good agreement with results from batch sorption experiments. BTCs for the conservative compound were relatively nonhysteretic for both white and gray chalk columns. In contrast, BTCs for the sorbing compounds were hysteretic in all cases, demonstrating that sorption was not at equilibrium before desorption began. These experiments suggest that on a field scale, transport of contaminants through fractures in chalk and other fractured porous media will be attenuated by diffusion and sorption into the matrix.
Note:
Related Files :
Adsorption
aquifer
breakthrough curve
Carbon
chemistry
Groundwater geochemistry
organic pollutant
water flow
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More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28893
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:42
Scientific Publication
Retardation of organic contaminants in natural fractures in chalk
40
Wefer-Roehl, A., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Adar, E., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Yakirevich, A., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Ronen, Z., Ben Gurion University of the Negev, Blaustein Institute for Desert Research, Sde Boker, 84990, Israel
Retardation of organic contaminants in natural fractures in chalk
Transport of a conservative compound and two sorbing compounds through fractured chalk was studied using flow-through columns consisting of chalk cores with a single subvertical fracture. Two types of chalk matrix were compared, an oxidized white chalk with low organic carbon content (0.2%), and a gray chalk with a higher organic carbon content (1.3%). Initial rapid breakthrough followed by a delayed approach to a relative concentration of unity for the conservative compound (2,6-difluorobenzoic acid [DFBA]) was clear evidence for diffusion into the porous chalk matrix. Matrix diffusion of DFBA was apparently much greater in the gray chalk columns than in the white chalk columns. Breakthrough curves (BTCs) of the sorbing compounds (2,4,6-tribromophenol [TBP] and ametryn [AME]) were retarded in all cases as compared to the conservative compound. Sorption retardation was far greater in the gray chalk as compared with the white chalk, in good agreement with results from batch sorption experiments. BTCs for the conservative compound were relatively nonhysteretic for both white and gray chalk columns. In contrast, BTCs for the sorbing compounds were hysteretic in all cases, demonstrating that sorption was not at equilibrium before desorption began. These experiments suggest that on a field scale, transport of contaminants through fractures in chalk and other fractured porous media will be attenuated by diffusion and sorption into the matrix.
Scientific Publication
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