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Effects of dissolved organic matter from a eutrophic lake on the freely dissolved concentrations of emerging organic contaminants
Author(s) -
Xiao YiHua,
Huang QingHui,
Vähätalo Anssi V.,
Li FeiPeng,
Chen Ling
Publication year - 2014
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.2625
Subject(s) - dissolved organic carbon , mesocosm , environmental chemistry , chemistry , bioavailability , organic matter , colored dissolved organic matter , eutrophication , partition coefficient , contamination , ecology , chromatography , phytoplankton , nutrient , organic chemistry , bioinformatics , biology
Abstract 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 K OC ) 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. Environ Toxicol Chem 2014;33:1739–1746 . © 2014 SETAC