Insight into the binding properties of carbamazepine onto dissolved organic matter using spectroscopic techniques during grassy swale treatment

Evaluation of Efficiently Removing Secondary Effluent Organic Matters (EfOM) by Al-Based Coagulant for Wastewater Recycling: A Case Study with an Industrial-Scale Food-Processing Wastewater Treatment Plant

“…The calculation of the R-W model is based on Equation (2): where I 0 is the DOM fluorescence intensity of the water sample without Alum; C M represents the Alum concentration; I represents the fluorescence intensity when the Alum concentration is C M ; C L represents the complexing capacity concentration of Al (mmol L −1 ), and K M is the Al complexing stability constant. At the same time, I ML indicates the concentration threshold of Al when the fluorescence intensity stabilizes; f is expressed as the quenching rate, that is, the ratio of the binding group to the total group that was calculated using Equation (3) [ 15 ].…”

“…The synchronous fluorescence (SF) spectra were recorded in the range of 250–550 nm with a constant offset (Δλ = 60 nm) using a fluorescence spectrophotometer (F-7000, Hitachi, Tokyo, Japan) with a scanning speed of 240 nm min −1 and a 1 nm scan spacing [ 15 ]. The SF spectra with different Al-based coagulant concentrations (see Section 2.2 ) were used to perform the two-dimensional correlation spectroscopy (2D-COS) using “2D-Shige” software (Kwansei-Gakuin University, Japan).…”

Using recirculating flumes and a response surface model to investigate the role of hyporheic exchange and bacterial diversity on micropollutant half-lives

“…All ume sediments had low organic carbon content (TC < 0.01%) and low content of ne particles (silt + clay < 1%), which generally rendered them poor sorbents. CBZ is neutral, has a log K OW of 2.77, and has been shown to sorb to organic matter 63 and to have relatively high retardation coefficient in sediment (3.6). 30 However, a test following OECD guideline 106 64 to examine potential sorption of CBZ to the ume sediments showed no sorption of CBZ to S1, S3 or S6 sediments (see ESI for details, Fig.…”

Interactions between Imidacloprid and Thiamethoxam and Dissolved Organic Matter Characterized by Two-Dimensional Correlation Spectroscopy Analysis, Molecular Modeling, and Density Functional Theory Calculations

“…Upon the addition of a quencher, some changes in the microenvironment and conformation of DOM related to the fluorescent functional groups can be obtained by synchronous fluorescence spectra. , The appearance of peak I at 282 nm and peak II at 338 nm in Figure can be referred to protein-like compounds (tryptophan-like and tyrosine-like substances) and humic-like compounds when Δλ = 60 nm, respectively . The fluorescence intensity of peak I and peak II of DOM gradually reduced with increasing concentrations of imidacloprid and thiamethoxam.…”

“…29,32 The appearance of peak I at 282 nm and peak II at 338 nm in Figure 2 can be referred to protein-like compounds (tryptophan-like and tyrosine-like substances) and humic-like compounds when Δλ = 60 nm, respectively. 33 The fluorescence intensity of peak I and peak II of DOM gradually reduced with increasing concentrations of imidacloprid and thiamethoxam. Compared to the initial fluorescence intensity, the fluorescence intensity of peak I (DOM + imidacloprid and thiamethoxam) was quenched by 98.6 and 83.6%, respectively, while the fluorescence intensity of peak II (DOM + imidacloprid and thiamethoxam) was quenched by 27.8 and 4.7%, respectively.…”