Physics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1889s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 7, pp.1889-1896
Physics
1
Scientific paper
The adsorption of acetate, butyrate, lactate, and stearate was measured using a clastic mud from Cape Lookout Bight N.C. (CLB), a lateritic muddy sand from Kahana Stream, Oahu, Hawaii (KS), and a fine carbonate sand from Waimanalo Beach, Oahu, (WB). Partition coefficients ( K d , moles adsorbed per g of solid phase/moles dissolved per ml of porewater) ranged from 10 2.3 to 10 -3.0 , and displayed the following trends: CLB > KS > WB, and stearate > acetate ~- butyrate > lactate. The percent adsorption of the sediment organic acid pools showed similar trends: stearate, 99%; acetate, 9-23%; butyrate, 5-23%; lactate, 0.2-7%. These results reflected the relatively nonpolar nature of the sand surfaces in WB and KS sediments, and the polarities of the organic acids. K d was approximately constant for each organic acid-sediment combination over a dissolved organic acid concentration range of 10 7 , using concentrations between 1M and 10 -14 M. This constancy over a wide porewater concentration range suggested that adsorption was not limited by the availability of surface adsorption sites.
Andrews Christine C.
Okamoto Mauri Y.
Sansone Francis J.
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