title: Relevance of Radiocaesium Interception Potential (RIP) on a worldwide scale to assess soil vulnerability to 137Cs contamination.
abstract: The extent of radiocaesium retention in soil is important to quantify the risk of further foodchain contamination. The Radiocaesium Interception Potential (RIP -Cremers et al., 1988, Nature 335, 247-249) is an intrinsic soil parameter which can be used to categorize soils or minerals in terms of their capacity to selectively adsorb radiocaesium. In this study, we measured RIP for a large soil collection (88 soil samples) representative of major FAO soil reference groups on a worldwide scale and tested the possibility to predict the RIP on the basis of other easily accessible or measurable soil data. We also compared RIP values with those obtained from separate chemical extraction experiments. The range of measured RIP values (1.8-13300 mmol kg(-1)) was shown to include nearly all possible cases of agricultural soil contamination. Only Podzols, Andosols and Ferralsols were clearly characterized by a very low RIP (<2000 mmol kg(-1)). On a worldwide scale, RIP was in fact slightly related to soil reference type or other simple major physicochemical parameters such as clay percentage or organic matter. Conversely our results indicated a link between the RIP and radiocaesium extractability across very different soils. We showed that, with the proposed scale of RIP values, a simple acid extraction method can provide an operational result highly predictive of potential RIP despite very contrasting soil properties. The RIP could be estimated from the empirical equation: RIP = (-31.701 ∗ log(AER) + 58.886)(2) where AER is the fraction of acid-extractable radiocaesium.
authors.affiliation: SCK•CEN, Belgian Nuclear Research Center, Foundation of Public Utility, Biosphere Impact Studies, Boeretang 200, 2400 Mol, Belgium.
authors.forename: Louis
authors.initials: L
authors.lastname: Vandebroek
authors.forename: May
authors.initials: M
authors.lastname: Van Hees
authors.forename: Bruno
authors.initials: B
authors.lastname: Delvaux
authors.forename: Otto
authors.initials: O
authors.lastname: Spaargaren
authors.forename: Yves
authors.initials: Y
authors.lastname: Thiry
mesh_terms: D000538:Aluminum Silicates / Q000032:analysis / Q000302:isolation & purification / Q000633:toxicity; D002588:Cesium Radioisotopes / Q000032:analysis* / Q000302:isolation & purification / Q000633:toxicity; D000077215:Clay; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009930:Organic Chemicals / Q000032:analysis / Q000302:isolation & purification / Q000633:toxicity; D010945:Plants, Edible / Q000254:growth & development / Q000378:metabolism* / Q000528:radiation effects; D018570:Risk Assessment; D019346:Sodium Acetate / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012990:Soil Pollutants, Radioactive / Q000032:analysis* / Q000302:isolation & purification / Q000633:toxicity; D052616:Solid Phase Extraction / Q000379:methods; D012997:Solvents / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D002588:Cesium Radioisotopes; D009930:Organic Chemicals; D012987:Soil; D012990:Soil Pollutants, Radioactive; D012997:Solvents; D019346:Sodium Acetate; D006851:Hydrochloric Acid; D000077215:Clay