Abstract
ABSTRACT Extensive subsidence and submergence of agricultural land has been caused by coal mining activities in the Huainan Coal Mine Area, China. Considering the site-specific regional water chemistry, we investigated the influence of ion solutions on phosphorus (P) adsorption behavior in the sediments of a 20-year-old body of water. The P isothermal adsorption was measured in four different types of ion solutions, prepared through additions of sodium chloride (NaCl), calcium chloride (CaCl2), sodium bicarbonate (NaHCO3), a mixture of sodium bicarbonate and calcium chloride (NaHCO3 + CaCl2), and ultra pure water (deionized water with specific resistivity reaching the value of 18 MΩ cm) as a control. The sediments parameters analyzed included P-fractions, organic matter (OM), iron oxides, clay, and others, with the aim of analyzing their individual effects on P adsorption. Cationic calcium (Ca2+) was to found to enhance P adsorption ability, while a weakly alkaline environment (simulated through NaHCO3 ad...
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