![Effect of clay content and wetting-and-drying on radiocaesium behaviour in a peat and a peaty podzol [An article from: Science of the Total Environment, The]](https://www.ebooknetworking.net/books/B00/0PA/bigB000PA9ZB0.jpg)
Effect of clay content and wetting-and-drying on radiocaesium behaviour in a peat and a peaty podzol [An article from: Science of the Total Environment, The]
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PublisherElsevier
ISBN / ASINB000PA9ZB0
ISBN-13978B000PA9ZB5
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MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Science of the Total Environment, The, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The interaction of radiocaesium with peat under two moisture regimes was studied in laboratory experiments and by growing ryegrass in pot experiments to simulate changing field moisture conditions. A peat untreated and treated with 5% by weight of clay containing 46% illitic minerals, and a peaty podzol naturally containing 4.5% mineral matter on a dry weight basis were contaminated with ^1^3^4Cs and incubated. The soils were exposed to 8 wetting-and-drying cycles or kept constantly wet during 40 days. Extraction of the peat with 1 M CH"3COONH"4 (pH 7) repeated after each wetting-and-drying cycle indicated increasing ^1^3^4Cs fixation with time of incubation. The peat treated with clay showed a much higher ^1^3^4Cs fixation than that without clay. The pot experiment with the incubated soils showed a ^1^3^4Cs transfer to ryegrass of the same order for the peaty podzol as for the peat treated with clay. For the peat untreated with clay the ^1^3^4Cs transfer to ryegrass was much greater. Wetting-and-drying the peat, with or without clay, increased the overall yield of grass and the concentration and uptake of ^1^3^4Cs over 5 consecutive harvests. K-fertilisation increased the yield of plant material (except for the peat with added clay), decreased the concentration of ^1^3^4Cs, but had no significant effect (p=0.05) on the resultant uptake of ^1^3^4Cs. Mixing clay with the surface layer of organic soils appears to be an effective means of decreasing radiocaesium transfer to field crops in fallout situations.
Description:
The interaction of radiocaesium with peat under two moisture regimes was studied in laboratory experiments and by growing ryegrass in pot experiments to simulate changing field moisture conditions. A peat untreated and treated with 5% by weight of clay containing 46% illitic minerals, and a peaty podzol naturally containing 4.5% mineral matter on a dry weight basis were contaminated with ^1^3^4Cs and incubated. The soils were exposed to 8 wetting-and-drying cycles or kept constantly wet during 40 days. Extraction of the peat with 1 M CH"3COONH"4 (pH 7) repeated after each wetting-and-drying cycle indicated increasing ^1^3^4Cs fixation with time of incubation. The peat treated with clay showed a much higher ^1^3^4Cs fixation than that without clay. The pot experiment with the incubated soils showed a ^1^3^4Cs transfer to ryegrass of the same order for the peaty podzol as for the peat treated with clay. For the peat untreated with clay the ^1^3^4Cs transfer to ryegrass was much greater. Wetting-and-drying the peat, with or without clay, increased the overall yield of grass and the concentration and uptake of ^1^3^4Cs over 5 consecutive harvests. K-fertilisation increased the yield of plant material (except for the peat with added clay), decreased the concentration of ^1^3^4Cs, but had no significant effect (p=0.05) on the resultant uptake of ^1^3^4Cs. Mixing clay with the surface layer of organic soils appears to be an effective means of decreasing radiocaesium transfer to field crops in fallout situations.
