Abstract：
:Due to its longevity, radioisotope 129I is a health concern following potential releases in the environment which raises questions about residence and exposure times relevant for risk assessments. We determined 127I concentrations (as a surrogate for 129I) in a series of French forest soils (i.e. litters, humus and mineral soils) under different vegetation and climate conditions in order to identify the major processes affecting its accumulation and persistence in the soil column. The input fluxes linked to rainfall, throughfall and litterfall were also characterized. Main results obtained showed that: (i) rainfall iodine concentrations probably influenced those of litterfall through absorption by leaves/needles returning to the ground; (ii) throughfall was the major iodine input to soils (mean = 83%), compared to litterfall (mean = 17%); (iii) humus represented a temporary storage of iodine from atmospheric and biomass deposits; (iv) iodine concentrations in soils depended on both the iodine inputs and the soil's ability to retain iodine due to its organic matter, total iron and aluminium concentrations; (v) these soil properties were the main factors influencing the accumulation of iodine in the soil column, resulting in residence times of 419-1756 years; and (vi) the leaching of iodine-containing organic matter dissolved in soil solution may be an important source of labile organic iodine for groundwater and streams.
journal_name
Chemospherejournal_title
Chemosphereauthors
Roulier M,Coppin F,Bueno M,Nicolas M,Thiry Y,Della Vedova C,Février L,Pannier F,Le Hécho Idoi
10.1016/j.chemosphere.2019.02.060subject
Has Abstractpub_date
2019-06-01 00:00:00pages
20-28eissn
0045-6535issn
1879-1298pii
S0045-6535(19)30278-4journal_volume
224pub_type
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