@article{fdi:010078947,
  title = {{R}etention of {B}e-10, {C}s-137 and {P}b-210(xs) in soils : impact of physico-chemical characteristics},
  author = {de {T}ombeur, {F}. and {C}ornu, {S}. and {B}ourles, {D}. {L}. and {D}uvivier, {A}. and {P}upier, {J}. and {B}rossard, {M}ichel and {E}vrard, {O}. and {E}quipe {A}ster},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {B}e-10, {C}s-137 and {P}b-210(xs) radionuclide fallout has been used for the last several decades to quantify various soil and geomorphological processes on different time scales. {H}owever, a basic assumption of the studies relying on these radionuclides is that they have a strong affinity for soil particles and that their mobility in soil solution and losses through leaching can be neglected. {A}nother area of the scientific literature deals with the radionuclide mobility in soils as solute. {I}n that context, the objective of this work is to determine the pedological conditions under which this hypothesis of poor solute mobility of radionuclides is valid. {T}o this end, meteoric {B}e-10, {C}s-137 and {P}b-210(xs) concentrations were measured in six soil profiles representative of 5 soil types contrasted in terms of physico-chemical properties: an {A}ndosol and a {L}uvisol under pasture, a {F}erralsol and a {L}eptosol under forest and a {P}odzol both under forest and cultivation. {T}he main soil properties (soil p{H}, organic carbon ({OC}) content, particle size distribution and specific extractions) were measured. {T}he < 2 mu m fraction was extracted to measure radionuclide activities and undertake mineralogical analysis. {R}esults show that meteoric {B}e-10 is significantly leached from soils whose p{H}(w) is lower than 5, regardless of the < 2 mu m particle proportion and {F}e oxides content. {S}ignificant {C}s-137 losses through leaching can generally be neglected except in sandy soils whose p{H}(w) is lower than 4.5 ({P}odzol). {N}o significant {P}b-210(xs) losses were evidenced. {F}or the three radionuclides considered, the major part of their budget is associated with the < 2 mu m fraction. {H}owever, concerning the {A}ndosol, the proportion of radionuclide budget associated with the < 2 mu m fraction represents < 40%. {W}ith regards to the forested {P}odzol, two thirds of the {P}b-210(xs) budget is associated with the litter. {W}ell-crystallized {F}e oxides, illite and interlayered clay minerals as well as allophane, imogolite and other {A}l-phases in the {A}ndosol and kaolinite in highly weathered acidic soils ({F}erralsol) were found to efficiently retain {B}e-10. {F}inally, litter degradation and the content of large particulate organic matter were shown to control {P}b-210(xs) concentrations. {A}s expected, our results highlight strong contrasts in the retention of the considered isotopes according to soil physico-chemical properties. {A}ccordingly, their mobility and losses through solute transport should be considered when using them for quantifying solid transport and future mass transport models must be improved, in particular through the addition of a solute transfer term. {O}therwise, soil redistribution might be strongly overestimated for {P}odzols, {F}erralsols and also most probably for other acidic tropical soil types ({N}itisols, {A}crisols, {P}linthisols).},
  keywords = {{R}adionuclides ; {C}osmogenic nuclides ; {T}ransfers in soils ; {B}earing phases ; {T}racers ; {F}allout ; {MONDE}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {367},
  numero = {},
  pages = {art. 114242 [13 ]},
  ISSN = {0016-7061},
  year = {2020},
  DOI = {10.1016/j.geoderma.2020.114242},
  URL = {https://www.documentation.ird.fr/hor/fdi:010078947},
}