CAJ | 학술논문

探讨了不同氧化还原条件下土壤外源砷（Ⅴ）的稳定化作用。研究结果表明不同氧化还原条件下外源水溶性砷（Ⅴ）进入土壤体系后，各种形态砷随培养时间增加的变化规律总体上表现较为一致。培养180天之后，水溶态和交换态砷在微孔扩散等作用下随培养时间分别下降至2.4％～4.7％和2.8％～3.2％。碳酸盐态砷主要受控于pH以及相应的表面沉淀作用。有机态砷存在再分配现象，最高值达48.8％～50.1％，有机态砷下降的同时，伴随氧化物态和残渣态砷的上升。越趋向氧化环境会使得土壤外源砷（Ⅴ）的稳定化程度越高，反之，越趋向还原环境土壤外源砷（Ⅴ）的稳定化程度越低。各种氧化还原条件下，土壤外源砷（Ⅴ）的稳定化过程均具有明显的阶段性特征，缺氧和过渡条件下表现为3阶段特征，而好氧条件下表现为4阶段特征。
탐토료불동양화환원조건하토양외원신（Ⅴ）적은정화작용。연구결과표명불동양화환원조건하외원수용성신（Ⅴ）진입토양체계후，각충형태신수배양시간증가적변화규률총체상표현교위일치。배양180천지후，수용태화교환태신재미공확산등작용하수배양시간분별하강지2.4％～4.7％화2.8％～3.2％。탄산염태신주요수공우pH이급상응적표면침정작용。유궤태신존재재분배현상，최고치체48.8％～50.1％，유궤태신하강적동시，반수양화물태화잔사태신적상승。월추향양화배경회사득토양외원신（Ⅴ）적은정화정도월고，반지，월추향환원배경토양외원신（Ⅴ）적은정화정도월저。각충양화환원조건하，토양외원신（Ⅴ）적은정화과정균구유명현적계단성특정，결양화과도조건하표현위3계단특정，이호양조건하표현위4계단특정。
Effect of redox conditions on the stabilization process of arsenate in soils has been investigated.The results show that the changes of arsenic fractions with increasing contact time are basically consistent after exoge-nous arsenate entering into soils under different redox conditions.After 180 days,with increasing contact time, water soluble and exchangeable arsenic were down to 2.4%-4.7% and 2.8%-3.2%,respectively,due to the diffusion of arsenic into micropores.Arsenic bound to carbonate is mainly controlled by the pH and the process of surface precipitation.The redistribution phenomenon of arsenic bound to organic matter occurs,and the highest values were up to 48.8%-50.1%,respectively.During the later period of incubation,arsenic bound to organic matter decreases with increasing contact time,while arsenic bound to Fe-Mn oxides and the re-sidual fraction of arsenic increase with increasing contact time.The stabilization process of arsenate in soils will be strengthened when the redox condition is from anoxic condition to oxic condition.In contrast,the stabiliza-tion process of arsenate in soils will be inhibited when the redox condition is from oxic condition to anoxic condi-tion.The stabilization process of arsenate in soils is obviously characterized by phases under different redox con-ditions.There are three phases for the stabilization process of arsenate in soils under the anoxic and transition conditions,while four phases occur under the oxic condition.