...
首页> 外文期刊>Environmental Science & Technology >Permeable Environmental Leaching Capsules (PELCAPs) for in Situ Evaluation of Contaminant Immobilization in Soil
【24h】

Permeable Environmental Leaching Capsules (PELCAPs) for in Situ Evaluation of Contaminant Immobilization in Soil

机译:用于土壤中污染物固定化原位评估的可渗透环境浸出胶囊(PELCAP)

获取原文
获取原文并翻译 | 示例
           

摘要

We encapsulated radioisotope-spiked soil within a water-permeable polyacrylamide matrix cast in a small cylindrical geometry (approx= 5 cm~3) to measure the persistence of immobilized soil contaminants.As a proof-of-principle,soils contained within these permeable environmental leaching capsules (PELCAPs) were labeled with either ~(85)Sr or ~(134)Cs and were leached in both laboratory tests and continuously in situ with ground and streamwaters at two field sites on the Oak Ridge reservation.Groups of PELCAPs were retrieved,assayed nondestructively for radioisotopes via y spectroscopy,and then replaced in ground and surface water repeatedly over a 6-month period.PELCAPs that contained no soil readily and quantitatively leached either ~(85)Sr or ~(134)Cs into laboratory extractants or ground or surface water with effective diffusion coefficients (D_(eff)) of (1.14 +- 0.06) and (4.8 +- 0.2) X 10~(-6) cm~2/s,respectively.PELCAPs containing untreated soil readily leached >90% of ~(85)Sr but <1% of ~(134)Cs during field leaching at both sites,whereas thermally treated soils quantitatively retained both isotopes under all conditions.Permeable polymer encapsulation methods,such as PELCAPs,offer the potential capability to conveniently test large numbers of soils and soil treatments for contaminant release and uptake under actual field environmental conditions.
机译:我们将掺有放射性同位素的土壤包裹在一个小的圆柱形几何结构(约5 cm〜3)中的透水聚丙烯酰胺基质中,以测量固定化土壤污染物的持久性。作为原理的证明,这些透水环境中所含的土壤用〜(85)Sr或〜(134)Cs标记浸出胶囊(PELCAPs),在两种实验室测试中均进行浸出,并在Oak Ridge保留地的两个田间场所连续用地下水和河水进行原位浸出。 ,通过y光谱法对放射性同位素进行了非破坏性测定,然后在6个月内重复更换为地下水和地表水。不含土壤的PELCAPs容易定量地将〜(85)Sr或〜(134)Cs淋洗到实验室萃取剂或地下水或地表水的有效扩散系数(D_(eff))分别为(1.14 +-0.06)和(4.8 +-0.2)X 10〜(-6)cm〜2 / s。含有未经处理的土壤的PELCAP易于浸出> 〜(85)Sr的90%但在两个位置的田间浸出过程中,<(134)Cs的含量不到1%,而经过热处理的土壤在所有条件下都定量保留了两种同位素。可渗透的聚合物包封方法(例如PELCAPs)提供了方便地测试大量土壤和土壤的潜在能力实际田间环境条件下污染物释放和吸收的处理方法。

著录项

  • 来源
    《Environmental Science & Technology》 |2005年第22期|p.8912-8918|共7页
  • 作者

    B.P.SPALDING; S.C.BROOKS;

  • 作者单位

    Environmental Sciences Division,Oak Ridge National Laboratory,P.O.Box 2006,Oak Ridge,Tennessee 37831;

    Environmental Sciences Division,Oak Ridge National Laboratory,P.O.Box 2006,Oak Ridge,Tennessee 37831;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号