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Examination of effects of Cu(II) and Cr(III) on Al(III) binding by dissolved organic matter using absorbance spectroscopy
- Source :
- Water Research. 93:84-90
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Effects of Cu(II) and Cr(III) ions on the binding of Al(III) onto Dissolved Organic Matter (DOM) exemplified by Suwannee River Humic Acid (SRHA) at pH 6.0 were quantified in this study using linear and log-transformed SRHA absorbance spectra acquired at varying Al(3+) concentrations and Cu(2+) or Cr(3+) levels. The competition between Al(3+) and Cu(2+)/Cr(3+) for the binding sites in DOM was ascertained by examining the intensity and shapes of the metal-specific differential spectra of DOM. The results indicated that the binding of Al(3+) onto SRHA is little influenced in the cases of in presence of 1.0 and 10.0 μM background Cr(3+) and in presence of 1.0 μM background Cu(2+), but it is significantly depressed in presence of 10.0 μM Cu(2+). Changes of the spectral slope of the log-transformed absorbance spectra in the 350-400 nm wavelength range (S350-400) were unambiguously correlated with the total amount of DOM-bound metals. The concentrations of Me-DOM complexes were determined using the NICA-Donnan Model. The results demonstrate that differential absorbance measurements provide quantitatively interpretable information concerning the nature and mechanisms of metal-DOM interactions and effects of metal cations competition on these processes.
- Subjects :
- Chromium
Environmental Engineering
Absorption spectroscopy
0208 environmental biotechnology
Analytical chemistry
chemistry.chemical_element
02 engineering and technology
010501 environmental sciences
01 natural sciences
Absorbance
Metal
Rivers
Cations
Dissolved organic carbon
Humic acid
Organic matter
Organic Chemicals
Spectroscopy
Waste Management and Disposal
Humic Substances
0105 earth and related environmental sciences
Water Science and Technology
Civil and Structural Engineering
chemistry.chemical_classification
Chemistry
Spectrum Analysis
Ecological Modeling
Hydrogen-Ion Concentration
Pollution
020801 environmental engineering
Ecological Modelling
Models, Chemical
visual_art
visual_art.visual_art_medium
Algorithms
Copper
Water Pollutants, Chemical
Aluminum
Subjects
Details
- ISSN :
- 00431354
- Volume :
- 93
- Database :
- OpenAIRE
- Journal :
- Water Research
- Accession number :
- edsair.doi.dedup.....f273d0cef0084e04332c55d21423b0ed