Removal of dissolved organic carbon by aquifer material: Correlations between column parameters, sorption isotherms and octanol-water partition coefficient

The partitioning behaviour of lindane between sediment, water and the prawn Metapenaeus macleayi was investigated. The sediment-to-water partition coefficient was determined with sealed glass vials in laboratory experiments and found to be 9.52, or 2164 on an organic carbon basis. This is in agreement with relevant literature data and confirms that the organic matter of the sediment is the primary sorption site in this process. The bioconcentration factor was evaluated from laboratory experiments with prawns in sealed glass jars in which the lindane seawater solution was changed frequently. Under these conditions, effective equilibrium was attained after 24 h. Measured uptake (k1) and clearance (k2) rate constants were smaller than predicted on the basis of existing general relationships between k1, k2 and the octanol/water partition coefficient (Kow) for crustaceans. The bioconcentration factor (KB) was found to be 5.50, or 1273 on a lipid basis, which is also smaller than values estimated from general relationships. The sediment-to-prawn bioaccumulation factor was 0.58, which means that biotic concentrations will be significantly less than those observed in sediments.

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ESTIMATION OF THE SOIL–WATER PARTITION COEFFICIENT NORMALIZED TO ORGANIC CARBON FOR IONIZABLE ORGANIC CHEMICALS

Environmental Toxicology and Chemistry ◽

10.1897/07-583.1 ◽

2008 ◽

Vol 27 (10) ◽

pp. 1995 ◽

Cited By ~ 107

Author(s):

Antonio Franco ◽

Stefan Trapp

Keyword(s):

Organic Carbon ◽

Partition Coefficient ◽

Soil Water ◽

Organic Chemicals ◽

Water Partition Coefficient

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The influence of source on the sorption of dissolved organic carbon by soils

Canadian Journal of Soil Science ◽

10.4141/s98-073 ◽

1999 ◽

Vol 79 (2) ◽

pp. 321-324 ◽

Cited By ~ 17

Author(s):

T. R. Moore ◽

L. Matos

Keyword(s):

Humic Acid ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

Partition Coefficient ◽

Sandy Soils ◽

Organic Soil ◽

Solution Concentration ◽

Null Point ◽

Doc Concentration ◽

Sorption Characteristics

We examined the influence of dissolved organic carbon (DOC) source on the sorption of DOC by two clayey and two sandy soils using seven extracts from plant tissues and organic soil horizons. Sorption characteristics, such as null-point DOC concentration, partition coefficient and intercept, were determined over the initial solution concentration range of 0–50 mg DOC L−1. The clayey soils had larger partition coefficients and higher null points than the sandy soils. There was an average threefold variation in null-point DOC concentration and partition coefficient amongst the seven DOC extracts. Fractionation of the DOC samples into humic acid and hydrophobic and hydrophilic acids, bases and neutrals revealed weak relationships between the sorption characteristics and DOC chemistry. Key words: Dissolved organic carbon, sorption, fractionation, humic acid, fulvic acid

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