好气条件下不同形态外源砷在土壤中的转化

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	好气条件下不同形态外源砷在土壤中的转化
	和秋红; 曾希柏; 李莲芳; 白玲玉
刊名	应用生态学报
	2010
卷号	21 期号:12 页码:3212-3216
关键词	好气条件土壤砷形态转化
ISSN号	1001-9332
其他题名	Transformation of different exogenous arsenic forms in soil under aerobic condition
英文摘要	在35%的田间持水量下,通过模拟试验研究了外源二甲基砷酸盐(DMA),一甲基砷酸盐(MMA),五价无机砷[As(V)]在土壤中的形态转化.结果表明:外源砷进入土壤后,其含量均有随时间推延而逐渐下降的趋势,两种不同形态的有机砷DMA和MMA在土壤中主要发生脱甲基化过程,经150d的恒温恒湿培养,其在土壤中主要转化为As(V),DMA处理仅在120d时检测到少量MMA,而MMA处理则在7~60d内均有少量的DMA生成.培养结束时土壤中DMA和MMA含量均显著降低(P<0.01),降幅分别为99.5%,94.3%,而两者的主要转化产物As(V)的含量则分别显著增加了4.61和5.15倍.表明外源有机态砷在土壤中基本上被转化为无机形态;与有机态外源砷相比,外源As(V)进入土壤后其形态基本上没有发生转化; An incubation test was conducted to study the transformation of exogenous dimethyl-arsenic acid ( DMA) ,monomethylarsenic acid ( MMA) ,and arsenate [As( V) ]in soil under the condition of 35% of water-holding capacity. After added into soil,the concentrations of test arsenic forms all showed a decreasing trend with time. The DMA and MMA were mainly demethylated,and after 120 days incubation at constant temperature and humidity,transformed into As( V) . A small amount of MMA was detected in the treatment with added DMA on the 120th day of incubation,and a small amount of DMA was detected in the treatment with added MMA during the period of 7-60 days incubation. By the end of the incubation test,the concentrations of added DMA and MMA in soil decreased significantly ( P < 0. 01) ,with the decrement being 99. 5% and 94. 3% and the concentration of transformed As( V) increased by 4. 61 and 5. 15 times,respectively. Comparing with DMA and MMA,the As( V) after added into soil had less form transformation
学科主题	环境科学基础理论
语种	中文
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/17211]
专题	农业环境与可持续发展研究所_环境修复研究室
作者单位	中国农业科学院农业环境与可持续发展研究所, 农业部农业环境与气候变化重点开放实验室, 北京, 100081
推荐引用方式 GB/T 7714	和秋红,曾希柏,李莲芳,等. 好气条件下不同形态外源砷在土壤中的转化[J]. 应用生态学报,2010,21(12):3212-3216.
APA	和秋红,曾希柏,李莲芳,&白玲玉.(2010).好气条件下不同形态外源砷在土壤中的转化.应用生态学报,21(12),3212-3216.
MLA	和秋红,et al."好气条件下不同形态外源砷在土壤中的转化".应用生态学报 21.12(2010):3212-3216.