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Adsorption of phosphate on tidal flat surface sediments from the Yangtze Estuary.
- Source :
- Environmental Geology; Sep2002, Vol. 42 Issue 6, p657-665, 9p
- Publication Year :
- 2002
-
Abstract
- Adsorption of phosphate (PO<subscript>4</subscript>-P) by sediments of nine sites taken from the Yangtze Estuarine and coastal tidal flats were studied in a laboratory. The results indicate that the process of phosphorus adsorption onto sediments mainly occurred within 0–10 h, and then reached a dynamic equilibrium. This experimental finding has shown maximum adsorption rates (ad-R) occurred within 0–0.5 h, ranging from 10.40–56.40 mg/kg h with regional differences. The adsorption rates were obviously related to concentrations of fine particles (<63 µm) in the sediments. Adsorption isotherm curves were fitted to the modified Langmuir equation. Adsorption capacities (ad-C) varied from 26.32 to 204.08 mg/kg, and showed good affinities for Fe<superscript>3+</superscript> and TOC concentrations. The adsorption efficiency (ad-E) of phosphate on sediments ranged from 21.55 to 248.30 L/kg, showing a close correlation with TOC concentrations. A correlation between environmental factors and phosphate adsorption is presented in this experiment. Phosphate adsorption is susceptible to changes in pH, temperature and salinity conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- SOIL absorption & adsorption
ADSORPTION (Chemistry)
SEDIMENTOLOGY
WETLANDS
ESTUARIES
Subjects
Details
- Language :
- English
- ISSN :
- 09430105
- Volume :
- 42
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Environmental Geology
- Publication Type :
- Academic Journal
- Accession number :
- 16565309
- Full Text :
- https://doi.org/10.1007/s00254-002-0574-3