Adsorption of three selected endocrine disrupting chemicals by aquatic colloids and sediments in single and binary systems

Abstract

Purpose Aquatic colloids are ubiquitous in natural river water, but their effects on the adsorption of pollutants by sediments are not fully understood. This study investigated the adsorption of three endocrine disrupting chemicals (EDCs) by aquatic colloids and sediments in single and binary systems. The role of aquatic colloids in the adsorption of EDCs by sediments in the binary system was evaluated. Materials and methods Water and sediment samples were collected from Huanyuankou (HS) and Lijin (LS) stations in the middle-low reaches of the Yellow River (China), and the aquatic colloids were separated using cross-flow filtration. The properties of aquatic colloids were characterized using an inductively coupled plasma-optical emission spectrometer, a TOC/TN analyzer, and a fluorescence spectrophotometer. Batch experiments were conducted to investigate the adsorption of three selected EDCs (bisphenol A (BPA), 17β-estradiol (E2), and 17α-ethynylestradiol (EE2)) by aquatic colloids and sediments. BPA, E2, and EE2 were quantified using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The adsorption data were described by the linear, Freundlich, and Langmuir adsorption isotherms. The contributions of aquatic colloids to the total adsorption of EDCs were evaluated in the context of the binary system of aquatic colloids and sediments. Results and discussion In a single system of colloids, the adsorption parameters of linear, Freundlich, and Langmuir isotherms (K f , K d , and K L Q max ) follow the order of BPA> EE2>E2, indicating the important role of inorganic minerals in the adsorption of EDCs. In a single system of sediments and binary system of colloids and sediments, the K f , K d , and K L Q max values follow the order of E2>EE2>BPA, suggesting that the main adsorption mechanism is hydrophobic interaction. Moreover, the colloids promote adsorption of EDCs by sediments in a binary system. Although the colloidal contents are much lower than the contents of the sediments, the contributions of colloids to the total EDCs adsorption are up to 35-60 % for LS and 10-28 % for HS. Conclusions In a single system of colloids, both organic and inorganic components of colloids enhance the adsorption of EDCs. In a single system of sediments and a binary system of colloids and sediments, the adsorption of EDCs is mainly induced by the nonspecific hydrophobic interaction between EDCs and organic matters in the sediments and colloids. The colloids enhance the adsorption of EDCs; the more the EDCs are adsorbed by colloids, the greater are the contributions of colloids to the total adsorption of EDCs.

A comparative proteomics study of Arabidopsis thaliana responding to the coexistence of BPA and TiO2-NPs at environmentally relevant concentrations

“…Thus, in this study we used environmentally relevant levels of BPA ranging from 10 to 1000 μg·kg −1 and TiO 2 -NPs concentrations from 1 to 100 mg·kg −1 for the treatments as shown in Table 1 . Uncertain parameters in biosolids have been reported, such as organic matter ( Simonin et al, 2021 ; Wu et al, 2017 ; Zhu et al, 2012 ) and soil colloid ( Campos et al, 2020 ; Philippe et al, 2018 ; Sun and Zhou, 2015 ). In order to avoid the discrepancy, agar media were used for the treatment and control groups and supplemented with growth medium ( Weigel and Glazebrook, 2002 ) (400 mL 1 × MS medium with 0.6% (g/g) agar powder).…”

Contemporary Techniques for Remediating Endocrine-Disrupting Compounds in Various Water Sources: Advances in Treatment Methods and Their Limitations

“…Distinctly, single layer adsorbate occurs in chemisorption, and the mechanism is influenced by the aforementioned treatment factors [163]. Adsorption technique for the removal of EDCs from various water sources using AC has received extensive efforts, which have yielded considerable progress in the last two decades [164][165][166]. For example, Temmink et al [139] and Kovalova et al [25] in their separate studies reported excellent EDCs removal using PAC, ranging between 84% and 99% under different operating adsorption conditions.…”

Effects of carbon nanotubes on phosphorus adsorption behaviors on aquatic sediments

“…In natural aquatic systems, most pollutants are adsorbed to fine particles (Sun and Zhou, 2014). The sediments were dried under air at room temperature, homogenized, and passed through a 63 µm nylon sieve.…”

“…The sediments were dried under air at room temperature, homogenized, and passed through a 63 µm nylon sieve. The fraction containing particles with a size < 63 µm was sealed in plastic bags in the dark and stored at room temperature; only this fraction of sediments is considered to be geochemically important and evenly distributed in river cross-sections (Horowitz et al, 1990;Sun and Zhou, 2014). Thus, the sediment fraction with a size of < 63 µm is utilized in this experiment.…”