Investigating the Binding Properties between Strontium and Dissolved Organic Matter under the Influence of pH and Ca 2+ in a Typical Karst Area, China

Xin Yao, Chuntian Su (), Tuantuan Fan, Haoyu Ren and Fei Luo
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Xin Yao: School of Geography and Environment, University of Liaocheng, Liaocheng 252000, China
Chuntian Su: Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & GZAR, Guilin 541004, China
Tuantuan Fan: School of Geography and Environment, University of Liaocheng, Liaocheng 252000, China
Haoyu Ren: College of Water Sciences, Beijing Normal University, Beijing 100875, China
Fei Luo: Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & GZAR, Guilin 541004, China

Land, 2022, vol. 11, issue 9, 1-16

Abstract: Due to the unique hydrogeological environment of karst areas, pollutants are more likely to enter the soil and water, showing a special migration and transformation behavior. In this work, the binding behaviors between strontium (Sr 2+ ) and dissolved organic matter (DOM) extracted from soil under the influence of pH and Ca 2+ in a typical karst area were investigated by applying three-dimensional fluorescence spectroscopy combined with parallel factor analysis (EEM–PARAFAC) and two-dimensional correlation analysis (2D-COS) of synchronous fluorescence spectra (SF). The results show that DOM extracted from soil was dominated by tryptophan-like and tyrosine-like materials (77% in total). Two-dimensional COS of SF showed that the tryptophan-like substance in DOM extracted from soil preferentially bound to Sr 2+ . When the pH was 7, the binding coefficient (log K a ) of the four DOM components ranged from 2.69 to 4.04, which was more conducive to the binding of DOM extracted from soil and Sr 2+ than under acidic and alkaline conditions. Ca 2+ in soil weakened the binding of DOM extracted from soil to Sr 2+ by competing for binding sites and changing the molecular surface potential. This research is helpful for acknowledging the migration and transformation of Sr 2+ and offers a reference for groundwater protection in karst areas.

Keywords: dissolved organic matter (DOM); Strontium (Sr 2+ )-rich groundwater; competition of calcium (Ca 2+ ); karst areas; EEM–PARAFAC (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2022
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