Characterization of binding site heterogeneity for copper within dissolved organic matter fractions using two-dimensional correlation fluorescence spectroscopy

Insight into the evolution, redox, and metal binding properties of dissolved organic matter from municipal solid wastes using two-dimensional correlation spectroscopy

“…3a, an auto-peak was observed at the k 1 /k 2 wavelength pair of 359/359, and a negative cross-peak was detected at the k 1 /k 2 wavelength of 338-385/280. According to previous studies (Hur and Lee, 2011;He et al, 2011), the peak at 280 nm in the SF spectra was ascribed to protein-like matter, while the peak at 338-385 nm was contributed by fulvic-and humic-like substances. The existence of the negative cross-peak at 338-385/280 suggests that the protein-like matter and fulvic-and humic-like substances varied inversely during composting.…”

“…For instances, the heavy metals bound with humic substances exhibit a low bioavailability compared with the free meal ions, and hexavalent chromium shows a high toxicity with regard to trivalent chromium (He et al, 2014a). DOM can interact with heavy metals or adsorb hydrophilic organic pollutants due to the existence of O-, N-, and S-containing functional groups (Hur and Lee, 2011;Yu et al, 2012), which has an important influence on the bioavailability of the metals in MSWs (Xi et al, 2012). Furthermore, DOM can accept or donate electrons and act as an oxidant or reducing agent (Maurer et al, 2010;Gu et al, 2011), which change the valence state and toxicity of the metals such as Cr (He et al, 2014a).…”

“…Furthermore, it allows one to easily probe the sequential order of spectral signal change in response to external perturbations such as pressure, temperature, and pH (Hur and Lee, 2011;Yu et al, 2011), which may be useful to investigate the response of MSW-derived DOM upon composting time. In addition, 2D heterospectral correlation spectroscopy is often used to investigate the covariation of two different spectra such as FTIR and SF (Yu et al, 2011).…”

Combination of two-dimensional correlation spectroscopy and parallel factor analysis to characterize the binding of heavy metals with DOM in lake sediments

“…Carboxylic and phenolic groups in DOM structures were generally assumed to act as weak and strong metal binding sites, respectively [6,7]. In particular, the contents of carboxylic carbon and aromatic structures exhibited close relationships with the capacities of metal binding [7,8].…”

Association between arsenic and different-sized dissolved organic matter in the groundwater of black-foot disease area, Taiwan

“…The stability constants of As with mangrove DNA complexes had been determined by FQT method (Majumder et al, 2014b). The FQT is a simple and non-destructive method (Ohno et al, 2008;Yamashita and Fjaffe, 2008;Wu et al, 2011Wu et al, , 2012Hur and Lee, 2011a). The assumption of FQT technique is that only 1:1 metal/ligand complexes are formed.…”