MOBILITY AND PLANT UPTAKE OF INORGANIC C-14 AND C-14-LABELED PCB IN SOILS OF HIGH AND LOW RETENTION

被引:28
|
作者
SHEPPARD, MI
SHEPPARD, SC
AMIRO, BD
机构
[1] Environmental Science Branch, AECL Research, Whiteshell Laboratories, ROE 1L0, Pinawa, Manitoba
来源
HEALTH PHYSICS | 1991年 / 61卷 / 04期
关键词
D O I
10.1097/00004032-199110000-00003
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Quantifying and understanding the mobility of C-14 and organic pollutants in soils is important, especially in the context of underground waste disposal. We studied migration of C-14 applied as NaHCO3 (C-14-CO3) and as 2,2',5,5' tetrachlorobiphenyl (C-14-PCB) in carbonated, high-organic-matter-content and acidic, low-organic-matter-content undisturbed soil cores. The mobility of C-14-PCB depends on the profile distribution and amount of soil organic matter, whereas the mobility of C-14-CO3 depends primarily on the soil carbonate content. The solid/liquid partition coefficients (K(d)) for C-14-CO3 were 6.7 and 1.2 mL g-1 for the two soils, respectively. For the C-14-PCB, the corresponding K(d) values were 49 and 22 mL g-1. Plant/soil concentration ratios (CR) for inorganic C-14 have previously been derived using overly conservative assumptions. Using plants grown in outdoor lysimeters, CR values for C-14-CO3 of 0.7 and 1.3, on a dry-weight basis, were measured for the two soils. These values are about 25-fold lower than the currently used values. The corresponding CR values for C-14-PCB were 0.014 and 0.088. For both C-14 sources, there was evidence of atmospheric transfer from the soil to the plants. This was especially important for C-14-CO3, where it may have been dominant. Detailed modelling of C-14 transport from underground waste disposal should include volatilization as a loss process from soil as well as a source for plants.
引用
收藏
页码:481 / 492
页数:12
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