Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Field-derived Henry's law constants for polychlorinated biphenyls in oceanic waters
AU - Gioia, Rosalinda
AU - Jones, Kevin C.
AU - Lohmann, Rainer
AU - Nizzetto, Luca
AU - Dachs, Jordi
PY - 2010/5/27
Y1 - 2010/5/27
N2 - Accurate knowledge of Henry's law constants (Kaw) is very important for fate and transport studies of organic chemicals. Here field-derived Kaw values for polychlorinated biphenyl (PCB) congeners (PCBs 28, 49, 52, 118, 138, 149, and 153) were determined in the open Atlantic Ocean, at locations where air and seawater were assumed to be at equilibrium. Field-based Kaw values were derived from air and seawater samples simultaneously collected at these locations, and their relationship with temperature was determined. The average field-derived Kaw for PCBs 28, 49, 52, 118, and 138 was generally 2-3 times higher than laboratory-derived values reported in the literature. Possible causes of differences between the field and the laboratory data may be attributed to differences between pure water and seawater and the use of much higher persistent organic pollutant concentrations in laboratory studies compared to that of the remote ocean. Field-derived K aw values for PCB 149 and PCB 153 were up to 10 times higher than literature values. The comparison of field- and laboratory-derived K aw shows that their temperature dependence is not significantly different (95% confidence) from those reported in the literature.
AB - Accurate knowledge of Henry's law constants (Kaw) is very important for fate and transport studies of organic chemicals. Here field-derived Kaw values for polychlorinated biphenyl (PCB) congeners (PCBs 28, 49, 52, 118, 138, 149, and 153) were determined in the open Atlantic Ocean, at locations where air and seawater were assumed to be at equilibrium. Field-based Kaw values were derived from air and seawater samples simultaneously collected at these locations, and their relationship with temperature was determined. The average field-derived Kaw for PCBs 28, 49, 52, 118, and 138 was generally 2-3 times higher than laboratory-derived values reported in the literature. Possible causes of differences between the field and the laboratory data may be attributed to differences between pure water and seawater and the use of much higher persistent organic pollutant concentrations in laboratory studies compared to that of the remote ocean. Field-derived K aw values for PCB 149 and PCB 153 were up to 10 times higher than literature values. The comparison of field- and laboratory-derived K aw shows that their temperature dependence is not significantly different (95% confidence) from those reported in the literature.
U2 - 10.1029/2008JC005054
DO - 10.1029/2008JC005054
M3 - Journal article
AN - SCOPUS:77953608062
VL - 115
JO - Journal of Geophysical Research: Oceans
JF - Journal of Geophysical Research: Oceans
SN - 8755-8556
IS - 5
M1 - C05024
ER -