An Insight into the Sorption Behavior of 2,3,7,8-Tetrachlorodibenzothiophene on the Sediments and Paddy Soil from Chaohu Lake Basin

Kainan Nian, Wenli Xiong, Yalu Tao, Ziqing Zhu, Xiaoxue Pan (), Kang Zhang and Xuesheng Zhang ()
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Kainan Nian: School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
Wenli Xiong: School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
Yalu Tao: School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
Ziqing Zhu: China Science and Technology Intelligent Agricultural Valley Collaborative Innovation Research Institute, Hefei 231131, China
Xiaoxue Pan: School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
Kang Zhang: School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
Xuesheng Zhang: School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China

IJERPH, 2022, vol. 19, issue 18, 1-15

Abstract: Considering the frequent detection of polychlorinated dibenzothiophenes (PCDTs) in various environmental matrices and the potential ecological health risks, the environmental behavior of such compounds needs to be elucidated further. In this work, the sorption behavior of 2,3,7,8-tetrachlorodibenzothiophene (2,3,7,8-TCDT) onto three sediments and paddy soil from Chaohu Lake were investigated via batch equilibration experiments. From the perspective of sorption kinetics and isotherms, the sorption characteristics and mechanism of 2,3,7,8-TCDT on the above four carriers were compared, and the relationship between their structural characteristics and soil sorption capacity was discussed. Results suggested that rapid sorption played the primary role during the sorption process of 2,3,7,8-TCDT and the corresponding sorption isotherms were well fitted using the Freundlich logarithmic model. Moreover, the effects of pH and dissolved organic matter (DOM) on the sorption of 2,3,7,8-TCDT were investigated. The maximum sorption capacity of 2,3,7,8-TCDT on sediment was under acidic pH condition (pH = 4.0). Meanwhile, DOM at a low level promoted the sorption capacity of sediment toward 2,3,7,8-TCDT, while the high concentration of DOM inhibited this effect. In addition, the values of log K oc were obtained using high-performance liquid chromatography (HPLC) and did not show any significant correlation with organic carbon (OC) contents, thereby indicating that the partition effect was the dominating influencing factor for the sorption of 2,3,7,8-TCDT both on sediments and soil. This work provides useful data to understand the sorption behavior of 2,3,7,8-TCDT on sediments and soil and assess its potential environmental risk.

Keywords: 2,3,7,8-TCDT; Freundlich isotherm; dissolved organic matter; organic carbon normalized partitioning coefficient; Chaohu Lake (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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