Kinetics of Cu(II) reduction by natural organic matter

The Journal of Physical Chemistry. a
A Ninh PhamT David Waite

Abstract

The kinetics of Cu(II) reduction by Suwannee River fulvic acid (SRFA) at concentrations from 0.25 to 8 mg L(-1) have been investigated in 2 mM NaHCO(3) and 0.7 M NaCl at pH 8.0. In the absence of oxygen, SRFA reduced Cu(II) to Cu(I) in a biphasic manner, with initial rapid formation of Cu(I) followed by a much slower increase in Cu(I) concentration over time. When present, oxygen only had a noticeable effect on Cu(I) concentrations in the second phase of the reduction process and at high [SRFA]. In both the absence and presence of oxygen, the rate of Cu(I) generation increased with increasing [SRFA]. At 8 mg L(-1) [SRFA], nearly 75% of the 0.4 μM Cu(II) initially present was reduced to Cu(I) after 20 min, although the yield of Cu(I) relative to [SRFA] decreased at [SRFA] > 1 mg L(-1). Two plausible kinetic modeling approaches were found to satisfactorily describe the experimental data over a range of [SRFA]. Despite some uncertainty as to which approach is correct, common features of both approaches were complexation of Cu(II) by SRFA and reduction of Cu(II) by two different electron donor groups within SRFA: a relatively labile electron donor (with a concentration of 1.1 × 10(-4) equiv of e(-) (g of SRFA)(-1)) that reduced Cu(...Continue Reading

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Citations

May 9, 2014·Inorganic Chemistry·Chen-Jui LinChien-Hou Wu
Feb 2, 2016·The Science of the Total Environment·William E PlattenTodd Peter Luxton
Apr 1, 2014·Free Radical Biology & Medicine·Xiu YuanT David Waite
Jul 15, 2015·Environmental Science. Processes & Impacts·Takumi SaitoToshihiko Ohnuki
Jan 31, 2020·Biofouling·Alwar Ramanujam PadmavathiSubba Rao Toleti
Jun 11, 2021·Environmental Science & Technology·Nanqing ZhouClara S Chan
Aug 13, 2021·The Science of the Total Environment·Mingxing WangTao Jiang
Sep 11, 2018·Environmental Science & Technology·Judith MehlhornBritta Planer-Friedrich
Dec 10, 2016·Environmental Science & Technology·Jiabin ChenChing-Hua Huang
Mar 12, 2015·Environmental Science & Technology·Jiabin ChenChing-Hua Huang
Jun 17, 2020·Environmental Science & Technology·Yuan ChengRixiang Huang

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