title: Adsorption and photodegradation of microcystin-LR onto sediments collected from reservoirs and rivers in Taiwan: a laboratory study to investigate the fate, transfer, and degradation of microcystin-LR.
abstract: OBJECTIVE
  This study demonstrated the adsorption capacity of microcystin-LR (MC-LR) onto sediment samples collected from different reservoirs (Emerald and Jade reservoirs) and rivers (Dongshan, Erhjen, and Wukai rivers) in Taiwan to investigate the fate, transport behavior, and photodegradation of MC-LR.
  
  
  METHODS
  Langmuir adsorption and photodegradation studies were carried out in the laboratory and tested the capability of sediments for MC-LR adsorption. These data suggested that sediments play a crucial role in microcystins degradation in aquatic systems.
  
  
  CONCLUSIONS
  The results of batch experiments revealed that the adsorption of MC-LR varied significantly with texture, pH, and organic matter content of sediments. Silty and clay textures of the samples were associated with larger content of organic matter, and they displayed the enhanced MC-LR adsorption. Low pH sediment showed increased adsorption of MC-LR. The effective photodegradation of MC-LR (1.6 μg/mL) was achieved within 60 min under 254 nm light irradiation.
  
  
  CONCLUSIONS
  A comparative study of adsorption capacity of all sediment samples was carried out and discussed with respect to different aspects. Among all, sediments collected from Jade reservoir showed enhanced MC-LR adsorption (11.86 μg/g) due to favored textural properties (BET surface area = 20.24 m2/g and pore volume = 80.70 nm).
  
  
  CONCLUSIONS
  These data provide important information that may be applied to management strategies for improvement of water quality in reservoirs and rivers and other water bodies in Taiwan.
authors.affiliation: Graduate Institute of Environmental Engineering, National Central University, Chung-Li, Taoyuan County 320, Taiwan.
authors.forename: Thirumavalavan
authors.initials: T
authors.lastname: Munusamy
authors.forename: Ya-Lan
authors.initials: YL
authors.lastname: Hu
authors.forename: Jiunn-Fwu
authors.initials: JF
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D019015:Geologic Sediments / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008387:Marine Toxins; D052998:Microcystins / Q000032:analysis / Q000737:chemistry*; D010782:Photolysis; D045483:Rivers / Q000737:chemistry*; D013624:Taiwan; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D014881:Water Supply / Q000032:analysis*
chemical_list: D008387:Marine Toxins; D052998:Microcystins; D014874:Water Pollutants, Chemical; C057862:cyanoginosin LR