Characterizing Properties and Environmental Behaviors of Dissolved Organic Matter Using Two-Dimensional Correlation Spectroscopic Analysis

Abstract

Dissolved organic matter (DOM) exists ubiquitously in environments and plays critical roles in pollutant mitigation, transformation, and organic geochemical cycling. Understanding its properties and environmental behaviors is critically important to develop water treatment processes and environmental remediation strategies. Generalized two-dimensional correlation spectroscopy (2DCOS), which has numerous advantages, including enhancing spectral resolution and discerning specific order of structural change under an external perturbation, could be used as a powerful tool to interpret a wide range of spectroscopic signatures relating to DOM. A suite of spectroscopic signatures, such as UV–vis, fluorescence, infrared, and Raman spectra that can be analyzed by 2DCOS, is able to provide additional structural information hiding behind the conventional one-dimensional spectra. In this article, the most recent advances in 2DCOS applications for analyzing DOM-related environmental processes are reviewed, and the state-of-the-art novel spectroscopic techniques in 2DCOS are highlighted. Furthermore, the main limitations and requirements of current approaches for exploring DOM-related environmental processes and how these limitations and drawbacks can be addressed are explored. Finally, suggestions and new approaches are proposed to significantly advance the development of 2DCOS in analyzing the properties and behaviors of DOM in natural and engineered environments.

Mercury cycling in freshwater systems - An updated conceptual model

“…Furthermore, Hg typically does not comply to theoretical frameworks for bio-uptake of metals such as the Free Ion Activity, Biotic Ligand or Surface Complexation Models (Fein, 2017;Morel, 1983;Paquin et al, 2002) although a recent study investigating the role of microbial biogenic synthesis of thiols is challenging this view (Adediran et al, 2019). Moreover, the complex physicochemical mosaic that areHg-DOM complexes is subject to change under varying pH, ionic strength, redox or surface interactions (Chen et al, 2019). It is therefore important that field studies complement laboratory approaches in investigating its role in affecting HgII bioavailability for methylation (Schaefer et al, 2011;Schaefer and Morel, 2009;Schwartz et al, 2019).…”

Visualizing Mineral-Associated Organic Matters in Long-Term Fertilization Treated Soils by NanoSIMS and SR-FTIR

“…To further identify the types and spatial distribution of functional groups of mineral-associated organic matter in the contrasting fertilization treatments, the high resolution of spatially-related SR-FTIR spectromicroscopy (with the fine scan model, 1 µm step −1 ) was used to collect the spectra through the soil particles (Figure 3). Obviously, the N-H stretching of amines (∼3,200-3,400 cm −1 ) (36, 37), C-H stretching of lipids (∼2,920 cm −1 ) (36), and aromatic C=C vibrations and amide N-C stretch (∼1,650 and 1,530 cm −1 , respectively) (37) were stronger in the long-term manure fertilized soil (i.e., M) than those in the long-term inorganic fertilized soil (i.e., NPK) (Figure 3). Notably, the strong absorbance of functional groups from secondary minerals (<950 cm −1 ) (38) supported that secondary minerals (e.g., Fe-O and Al-O) played a vital role in the SOC storage, which was supported by the results from NanoSIMS images (Figure 2).…”

The binding characteristics of sediment-derived dissolved organic matter with ceftazidime: a microstructural and spectroscopic correlation study

“…Furthermore, Fourier transform-infrared (FTIR) spectroscopy is a commonly used technique that presents a holistic insight into the chemical bond composition (Ouatmane et al, 2013;Tandy et al, 2010). To further understand the interaction mechanisms of complex compounds, two-dimensional correlation spectroscopy (2DCOS) analysis integrates FTIR spectroscope have been introduced to deconstruct the changes of different functional groups (Chen et al, 2019;Abdulla et al, 2010).…”