摘要
锑形态受到土壤理化性质、化学和机械组成的影响,其中铁氧化物及其形态影响最为显著。对5个不同类型土壤原位负载水铁矿,添加100 mg·L^(-1)的锑溶液淹水80 d,探讨水铁矿介导下土壤中锑形态转化规律。结果表明:负载的水铁矿以游离铁,无定形铁和络合铁形态存在,络合铁受土壤有机质含量的影响较大。载铁后土壤铁锰铝结合态锑和残渣态锑之和占总锑的96%以上,其中铁锰氧化物结合态锑占比最高。土壤非专性吸附态锑和专性吸附态锑通过静电吸附、配位、氧化、沉淀作用转化为铁锰铝结合态锑和残渣态锑,这种变化主要受土壤活化度、无定形铁和络合铁含量以及土壤pH、黏粒、氧化铝和氧化钙等成分含量的影响。在淹水过程中氧化铁形态的变化促使不同类型土壤中锑形态发生不同程度的转化。
The form of antimony(Sb)is influenced by physical and chemical properties of soil,chemical and mechanical composition,among which iron oxides and their forms have the most significant influence.In order to study the form transformation of Sb in soil under the influence of ferrihydrite,five different types of soils were flooded with 100 mg·L^(-1) Sb solution for 80 days after in situ loading of ferrihydrite.The influence of the transformation law of Sb forms in soils induced by loaded ferrihydrite was explored.The findings demonstrate that loaded ferrihydrite exists in three forms:free iron,amorphous iron,and complexed iron.The complexed iron is strongly influenced by the organic matter content in soil.The sum of Fe-Mn-Al combined Sb and residual Sb of soil accounts for more than 96%of the total Sb after loading iron,with the Fe-Mn-Al combined Sb accounting for the highest proportion.The nonspecific Sb and specific adsorbed Sb are transformed into Fe-Mn-Al combined Sb and residual Sb through electrostatic adsorption,coordination,oxidation,and precipitation.This change is mainly affected by soil activation degree,amorphous iron and complexed iron content as well as soil content such as pH,clay particles,aluminum oxide,and calcium oxide content.Changes in the form of iron oxide during flooding result in varying degrees of transformation of Sb forms in different types of soils.
作者
蒲涛
赵平
任维
崔婷
朱霞萍
PU Tao;ZHAO Ping;REN Wei;CUI Ting;ZHU Xiaping(College of Materials and Chemistry&Chemical Engineering(College of Lithium Resources and Lithium Battery Industry),Chengdu University of Technology,Chengdu,Sichuan 610059,China;Geological Party 105,Guizhou Province Bureau of Geology and Mineral Exploration and Development,Guiyang,Guizhou 550018,China)
出处
《贵州师范大学学报(自然科学版)》
北大核心
2025年第4期18-28,共11页
Journal of Guizhou Normal University:Natural Sciences
基金
国家自然科学基金项目(42267009)
贵州省地质矿产勘查开发局地质科研项目[2023]10#。
关键词
土壤
锑
水铁矿
形态
soil
antimony
ferrihydrite
forms
