Use of Illite Clay for In Situ Remediation of 137Cs-Contaminated Water Bodies: Field Demonstration of Reduced Biological Uptake

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• 作者：Thomas G. Hinton ; Daniel I.Kaplan ; Anna S. Knox ; Daniel P.Coughlin ; Rebecca V. Nascimento ; Siobahn I. Watson ; Dean E.Fletcher ; and Bon-Jun Koo
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：July 15, 2006
• 年：2006
• 卷：40
• 期：14
• 页码：4500 - 4505
• 全文大小：220K
• 年卷期：v.40,no.14(July 15, 2006)
• ISSN：1520-5851

文摘

We hypothesized that adding micaceous minerals to¹³⁷Cs-contaminated aquatic systems would serve as aneffective in situ remediation technique by sequestering thecontaminant and reducing its bioavailability. Results fromseveral laboratory studies are presented from which aneffective amendment material was chosen for a replicatedfield study. The field study was conducted over a 2-yearperiod and incorporated 16 3.3-m diameter column-plots (limnocorrals) that were randomly placed in a¹³⁷Cs-contaminated pond. The limnocorrals received threerates of amendment treatments to their water surfaces.The amendment material was a commercially available mineralwith high sorption (K_d &gt; 9000 L kg^-1) and low desorption(<20%) characteristics for cesium, even in the presence ofhigh concentrations of the competing cation, NH₄⁺. Inthe treated limnocorrals, ¹³⁷Cs concentrations were reducedsome 25-30-fold in the water, 4-5-fold in aquaticplants, and 2-3-fold in fish. The addition of the amendmentdid not adversely affect water chemistry, althoughincreased turbidity and subsequent siltation did alter theaquatic macroinvertebrate insect community. This in situtechnology provides a valuable, less-environmentally intrusivealternative to costly ex situ technologies that require thecontaminated sediment to be excavated prior to treatment,or excavated and disposed of elsewhere.