Differences in sequestration and bioavailability of organic compounds aged in dissimilar soils
Differences in sequestration and bioavailability of organic compounds aged in dissimilar soils
复制标题
DOI：
10.1021/es970740g
复制
发表时间：
1998-04-01
影响因子：
11.4
通讯作者：
Alexander, M
中科院分区：
文献类型：
--
作者：
Chung, NH;Alexander, M
对16种理化性质差异较大的土壤进行了200天的菲和阿特拉津老化试验。在定期的时间间隔在老化期间，螯合的程度是通过测量的化合物的生物降解的细菌和温和的提取程序提取的量。这两种化合物成为螯合在每一种土壤中，但螯合的速度和程度显着不同的土壤。在某些土壤中，螯合作用在120天内基本完成，但在其他土壤中，螯合作用持续时间更长。这两种化合物在16种土壤中的螯合程度并不高度相关。在土壤中的生物利用度的下降并不高度相关的可提取性或未提取的化合物的量的减少，虽然土壤中的生物利用度的下降最大，表现出最大的可提取性下降。由于土壤之间存在显著差异，因此尚不可能对土壤中的螯合率和程度作出概括。
Phenanthrene and atrazine were aged for 200 days in sterilized samples of 16 soils that differed greatly in physical and chemical properties. At regular intervals during the aging period, the extent of sequestration was determined by measurement of biodegradation of the compounds by bacteria and the amounts extracted by a mild extraction procedure. Both compounds became sequestered in each of the soils, hut the rate and extent of sequestration varied markedly among the soils. Sequestration was largely complete in some soils in 120 days, but it extended for longer periods in others. The extent of sequestration of the two compounds in the 16 soils was not highly correlated. The declines in bioavailability in the soils were not highly correlated with the decreases in extractability or the amounts of unextracted compounds, although soils in which the declines in bioavailability were greatest showed the greatest declines in extractability. Because of the marked differences among soils, generalizations about the rate and extent of sequestration in soils are not yet possible.