PMID: 16509326Mar 3, 2006Paper

Gross photoreduction kinetics of mercury in temperate freshwater lakes and rivers: application to a general model of DGM dynamics

Environmental Science & Technology
Nelson J O'DriscollM Amyot

Abstract

Previous published measurements of mercury photoreduction are for net-photoreduction, since photooxidation processes occur simultaneously. In this research we combine continuous dissolved-gaseous mercury (DGM) analysis with a photoreactor and a quartz sparger in order to derive mercury gross photoreduction rate constants for UVB and UVA irradiations. The DGM concentration in each filter-sterilized freshwater was measured at 5 min intervals over a period of 23 h. Photoreduction proceeded for the initial 200 min, after which, reducible mercury was depleted in the sample. Substantial losses in DOC fluorescence were observed during the incubations for UVA radiation but not for UVB; therefore, UVB photoreduction dynamics are not linked to a loss in DOC fluorescence. Pseudo first-order reaction kinetics fit the data well (r2 > 0.87). The rate constants appear divided between lakes and rivers with the mean lake UVB rate constant (kUVB = 8.91 x 10(-5) s(-1)), significantly less than the mean rate constant (kUVB = 1.81 x 10(-4) s(-1)) for the river samples. However, while there were differences for the UVB rates between lakes and rivers, the mean and median rate constants for UVA in lakes (kUVA = 7.76 x 10(-5) s(-1)) did not differ sign...Continue Reading

References

May 12, 2001·Environmental Science & Technology·J D LalondeF M Morel
Jul 27, 2002·Environmental Science & Technology·Steven D SicilianoD R S Lean
Mar 29, 2003·The Science of the Total Environment·N J O'DriscollD R S Lean
Dec 1, 1994·Environmental Science & Technology·M AmyotD R Lean

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Citations

Nov 5, 2011·Environmental Science & Technology·Elizabeth S CorbittElsie M Sunderland
Aug 20, 2014·Nature Communications·Yongguang YinGuibin Jiang
Feb 11, 2016·Environmental Science & Technology·Zhijia CiShiwei Wang
Aug 7, 2014·The Science of the Total Environment·E A MannN J O'Driscoll
Jan 10, 2012·The Science of the Total Environment·Feng HeBaohua Gu
Jul 22, 2015·Environmental Science & Technology·Yongmin WangYong Cai
Oct 7, 2008·Journal of Hazardous Materials·Lin DengNansheng Deng
Jun 20, 2017·The Science of the Total Environment·Rute CesárioJoão Canário
Aug 22, 2014·Scientific Reports·Xu-Sheng YangTong-Yi Zhang
May 21, 2019·Limnology and Oceanography·Cheng-Shiuan Lee, Nicholas S Fisher
Mar 12, 2010·The Journal of Physical Chemistry. a·Wang Zheng, Holger Hintelmann
Jun 24, 2009·Environmental Science & Technology·Olof RegnellTommy Hammar
Dec 22, 2009·Environmental Science & Technology·Asif QureshiKonrad Hungerbühler
Jun 4, 2017·Environmental Pollution·Hansell Gonzalez-RaymatYong Cai
Sep 1, 2018·Environmental Science & Technology·Alain ManceauLiliana Lefticariu
Apr 16, 2020·Environmental Science & Technology·Zhijia CiXiaoshan Zhang
Oct 27, 2010·Environmental Science & Technology·Anne L SoerensenRobert P Mason
Aug 30, 2014·Environmental Science & Technology·Anne L SoerensenElsie M Sunderland
Aug 30, 2008·Environmental Science & Technology·N J O'DriscollD R S Lean
Aug 30, 2008·Environmental Science & Technology·Lin Si, Parisa A Ariya
Jun 18, 2018·Journal of Environmental Sciences (China)·Nelson J O'DriscollMatthew Lukeman

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