Adsorption of Microcystin LR and LW on Suspended Particulate Matter (SPM) at Different pH

The occurrence of microcystins (MC) during aquatic blooms of cyanobacteria in eutrophicated freshwater body has increasingly become an environmental and health concern worldwide. An experimental study was conducted to investigate the adsorption of two common variants of microcystins, MCLR and MCLW,...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2008-07, Vol.192 (1-4), p.67-76
Main Authors: Liu, Guangliang, Qian, Yun, Dai, Shugui, Feng, Nan
Format: Article
Language:English
Subjects:
Adsorption
algal blooms
Amino acids
Applied sciences
Aquatic ecology
Atmospheric Protection/Air Quality Control/Air Pollution
Biological and physicochemical phenomena
chemical structure
Climate Change/Climate Change Impacts
Contamination
Cyanobacteria
Earth and Environmental Science
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environment
Environmental monitoring
Exact sciences and technology
Freshwater
Hydrogeology
Hydrophobicity
Isotherms
Microcystins
Natural water pollution
Particulate matter
particulates
pH effects
Pollutants
Pollution
Pollution, environment geology
Science
Soil Science & Conservation
sorption isotherms
Studies
Water
water pollution
Water Quality/Water Pollution
Water treatment and pollution
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Summary:The occurrence of microcystins (MC) during aquatic blooms of cyanobacteria in eutrophicated freshwater body has increasingly become an environmental and health concern worldwide. An experimental study was conducted to investigate the adsorption of two common variants of microcystins, MCLR and MCLW, onto SPM at different pH values. The results showed that most microcystins spiked into an SPM solution with the concentration of 0.25g/l was adsorbed onto solids at pH3 (>95%) and 7 (>85%). At pH13, the proportion of adsorbed microcystin decreased to 8-29% for MCLR and 38-47% for MCLW. The adsorption of MCLR and MCLW onto SPM fitted well with S type of Freundlich isotherm except for pH3 at which L type of Freundlich isotherm was suitable for MCLW. At pH3 and 7, linear isotherm was also able to describe the adsorption of MCLR and MCLW. The adsorption of MCLR and MCLW decreased significantly with the elevated pH, which is consistent with the pH-dependent hydrophobicity.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-008-9635-x