Effects of dissolved organic matter from a eutrophic lake on the freely dissolved concentrations of emerging organic contaminants.
The authors studied the effects of dissolved organic matter (DOM) on the bioavailability of bisphenol A (BPA) and chloramphenicol by measuring the freely dissolved concentrations of the contaminants in solutions containing DOM that had been isolated from a mesocosm in a eutrophic lake. The abundance and aromaticity of the chromophoric DOM increased over the 25-d mesocosm experiment. The BPA freely dissolved concentration was 72.3% lower and the chloramphenicol freely dissolved concentration was 56.2% lower using DOM collected on day 25 than using DOM collected on day 1 of the mesocosm experiment. The freely dissolved concentrations negatively correlated with the ultraviolent absorption coefficient at 254 nm and positively correlated with the spectral slope of chromophoric DOM, suggesting that the bioavailability of these emerging organic contaminants depends on the characteristics of the DOM present. The DOM-water partition coefficients (log KOC ) for the emerging organic contaminants positively correlated with the aromaticity of the DOM, measured as humic acid-like fluorescent components C1 (excitation/emission=250[313]/412 nm) and C2 (excitation/emission=268[379]/456 nm). The authors conclude that the bioavailability of emerging organic contaminants in eutrophic lakes can be affected by changes in the DOM.
Key Laboratory of Yangtze River Water Environment of the Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, China; Department of Environmental Sciences, University of Helsinki, Helsinki, Finland.
Yi-Hua
YH
Xiao
Qing-Hui
QH
Huang
Anssi V
AV
Vähätalo
Fei-Peng
FP
Li
Ling
L
Chen
D000042:Absorption; D001559:Benzhydryl Compounds / Q000032:analysis* / Q000737:chemistry* / Q000493:pharmacokinetics; D001682:Biological Availability; D002701:Chloramphenicol / Q000032:analysis* / Q000737:chemistry* / Q000493:pharmacokinetics; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D005068:Eutrophication; D006812:Humic Substances / Q000032:analysis; D060106:Lakes / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D010636:Phenols / Q000032:analysis* / Q000737:chemistry* / Q000493:pharmacokinetics; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000493:pharmacokinetics; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D002701:Chloramphenicol; D002734:Chlorophyll; D000077194:Chlorophyll A; D006812:Humic Substances; D009930:Organic Chemicals; D010636:Phenols; D014867:Water; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds
Bioavailability; Dissolved organic matter (DOM); Emerging organic contaminant; Eutrophication