Journal
WATER RESEARCH
Volume 81, Issue -, Pages 47-53Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.05.038
Keywords
Calcium; Copper; Complexation; Competition; Dissolved organic matter; NICA-Donnan model; Differential absorbance
Funding
- China NSF [21277005]
- US National Geographic Air and Water Conservation Fund [GEFC15-14]
- U.S. NSF [0931676]
- Foreign Experts Program of China
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0931676] Funding Source: National Science Foundation
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The binding of Ca2+ and Cu2+ by dissolved organic matter (DOM) exemplified by Suwannee River Humic Acid (SRHA) was examined in this study. Metal-DOM interactions were quantified using linear and log-transformed DOM absorbance spectra acquired at varying pHs and total Ca2+ and Cu2+ concentrations. The binding of Cu2+ by DOM was examined in the presence of three different Ca2+ concentrations. Interactions of Ca2+ with DOM chromophores were accompanied by the emergence of features in the differential spectra that were dissimilar from those characteristic for the binding of Cu2+. The amount of Ca2+ and Cu2+ bound by DOM was ascertained using changes of the slopes of log-transformed absorbance spectra in the range of wavelength 350-400 nm (denoted as S350-400) and comparing the data with model predictions. The observed effects indicated the occurrence of the replacement of a characteristic number of protons by the bound Ca2+ and Cu2+ ions. (C) 2015 Published by Elsevier Ltd.
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