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Deposition of carbonyl sulphide to soils
Abstract Carbonyl sulphide (COS) is a trace constituent of the atmosphere and is also the main form in which 35S is released from CO2-cooled nuclear reactors. Measurements of its deposition velocity (V g) are therefore important for validating radiological dose models and for interpreting the role of COS in the global S cycle. The V g of [35S]COS to thin layers of several contrasting soils was measured in a through-flow fumigation system. Deposition velocity was not significantly affected by soil type, although deposition to moist soil was significantly greater (P < 0.001) than for air-dried soils, mean values being 5.71 × 10−6 ms−1 and 3.06 × 10−6 ms−1, respectively. The results obtained are about three orders of magnitude smaller than published V g values for SO2 to similar soils, which suggests that uptake by soils is not a major sink for atmospheric COS. The results are consistent with the hypothesis that deposition to soil of [35S]COS from nuclear reactors is unlikely to contribute significantly to radiation dose from the food chain pathway. The reduction in V g observed in heat-treated soils indicates a microbial involvement in uptake. However, it seems unlikely that microbial metabolism is the rate-controlling step, since stimulation of the microflora by the addition of nutrients did not increase COS deposition.
Deposition of carbonyl sulphide to soils
Abstract Carbonyl sulphide (COS) is a trace constituent of the atmosphere and is also the main form in which 35S is released from CO2-cooled nuclear reactors. Measurements of its deposition velocity (V g) are therefore important for validating radiological dose models and for interpreting the role of COS in the global S cycle. The V g of [35S]COS to thin layers of several contrasting soils was measured in a through-flow fumigation system. Deposition velocity was not significantly affected by soil type, although deposition to moist soil was significantly greater (P < 0.001) than for air-dried soils, mean values being 5.71 × 10−6 ms−1 and 3.06 × 10−6 ms−1, respectively. The results obtained are about three orders of magnitude smaller than published V g values for SO2 to similar soils, which suggests that uptake by soils is not a major sink for atmospheric COS. The results are consistent with the hypothesis that deposition to soil of [35S]COS from nuclear reactors is unlikely to contribute significantly to radiation dose from the food chain pathway. The reduction in V g observed in heat-treated soils indicates a microbial involvement in uptake. However, it seems unlikely that microbial metabolism is the rate-controlling step, since stimulation of the microflora by the addition of nutrients did not increase COS deposition.
Deposition of carbonyl sulphide to soils
Kluczewski, S.M. (author) / Brown, K.A. (author) / Bel, J.N.B. (author)
Atmospheric Environment ; 19 ; 1295-1299
1984-11-29
5 pages
Article (Journal)
Electronic Resource
English
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