摘要
通过淹水条件下的培养试验,探讨了外源二甲基砷酸(DMA)、一甲基砷酸(MMA)、砷酸盐[As(V)]在土壤中的动态转化规律.结果表明:随着培养时间的推移,加入土壤中的DMA和MMA均主要转化为As(V),且土壤中As(V)含量均呈增加趋势,培养到150d时土壤中As(V)含量均显著高于1d时的含量(P<0.01).外源DMA通过脱甲基化作用,在30d内即基本转化为As(V),且有少量的亚砷酸盐[As(Ⅲ)]生成;而外源MMA的转化速度相对较慢,培养60d后才基本完成向As(V)的转化,同时伴随少量DMA和As(Ⅲ)的生成;在淹水条件下外源As(V)含量随培养时间的增加而逐渐降低,该过程中除有少量As(Ⅲ)生成外,其形态基本未发生改变.
An incubation test was conducted to study the dynamics of exogenously supplied dimethylarsenic acid（DMA）,monomethylarsonic acid（MMA）,and As（V） in soil under flooding.With the increasing time of incubation,the exogenously supplied DMA and MMA were mainly transformed into As（V）,and the As（V） concentration increased,being significantly higher after incubated for 150 days,compared with that after incubated for 1 day.The exogenously supplied DMA was demethylated into As（V） within 30 days,accompanied by a little As（Ⅲ）,while the transformation rate of exogenously supplied MMA was rather slow within 60 days,accompanied by a little As（Ⅲ） and DMA.The exogenously supplied As（V） decreased with increasing time of incubation,and its form had less change except that a little As（Ⅲ） occurred.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第11期2997-3000,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(40871102)
国家"十一五"科技支撑计划项目(2007BAD89B03)资助
关键词
土壤
淹水
砷
形态转化
soil
flooding
arsenic
form transformation.
