Effects of Fe3+ and Ca2+ on sorption of phenanthrene by Humin in karst soil,Southwest China  

作　　者：Xianjin An Wei Li Xinyue Di Jiacheng Lan 

机构地区：[1]School of Karst Science,Guizhou Normal University,550001 Guiyang,China [2]State Engineering Technology Institute for Karst Desertifi cation Control,550001 Guiyang,China [3]Guiyang University,550005 Guiyang,China [4]School of Geography and Environmental Engineering,Gannan Normal University,341000 Ganzhou,China

出　　处：《Acta Geochimica》2023年第1期125-135,共11页地球化学学报（英文）

基　　金：The national natural science Foundations of China under Grant (41761091);The first-class discipline group of geography of Guizhou Province under Grant (N0.[2019]125);Youth Science and Technology Talents Growth Fund of Education Department of Guizhou Province,China (No.KY[2022] 001);Scientific Research Funds of Guiyang University,China (No.GYU-KY-[2022]);The Joint Foundation of Guizhou Province under Grant (LH [2017]7348);The Doctor Foundation of Guizhou Normal University under Grant (GZNUD [2017]10)。

摘　　要：Humin(HM) is the main organic matter component to af fect the migration and transformation of polycyclic aromatic hydrocarbons(PAHs) in soil. The study on infl uence of the morphology change of inorganic ions on the adsorption of PAHs in soil and its organic matter is still rare at microscopic scale. In this paper, yellow soil humin(YS-HM) and lime soil humin(LS-HM) were chosen as samples, then Fe^(3+) and Ca^(2+) were added into samples to facilitate the precipitation by changing the existing conditions of ions, and the mechanism by which inorganic precipitation changed adsorption capacity of karst soil was analyzed from the microscopic scale. The results showed that the adsorption capacity of HM reduced with the inorganic precipitation increasing. The precipitation of Ca^(2+)and Fe^(3+) both reduced the adsorption capacity of YS-HM and LS-HM by 61.71% and 71.83% on average, respectively. The results of scanning electron microscope-energy dispersive spectrometry(SEM-EDS) and pore analysis showed that the HM porosity decreased after formation of Ca^(2+) and Fe^(3+) precipitation. According to the value of Freundlich parameter n, it may be because the precipitation or colloid of Ca^(2+) and Fe^(3+) fi lled micropores and covers high-energy adsorption sites of the HM. This research provides theoretical support for studying the PAHs migration and bioavailability of Calcium-rich in karst soil.

关 键 词：Inorganic ions HUMIN PHENANTHRENE Adsorption SOIL KARST 

分 类 号：X53[环境科学与工程—环境工程]