Connan O, Boust D, Billon G, Solier L, Rozet M, Bouderbala S
Laboratoire de Radioécologie de Cherbourg-Octeville, Institut de Radioprotection et de Sureté nucléaire (IRSN), Service d'Etudes et du Comportement des Radionucléides dans l'Environnement (SECRE), rue Max Pol Fouchet, Cherbourg-Octeville, France.
J Environ Radioact. 2009 Oct;100(10):905-13. doi: 10.1016/j.jenvrad.2009.06.016. Epub 2009 Jul 23.
A sequential extraction protocol has been used to determine the solid-phase partition of (210)Po and (210)Pb in anoxic marine sediment from the roads of Cherbourg (France) in the central English Channel. Measurements were also obtained in pore waters, in which (210)Po activities range between 1 and 20 mBq L(-1) and (210)Pb activities between 2.4 and 3.8 mBq L(-1), with highest activities in the topmost layer. These activities are higher than in seawater, suggesting that sediment act as a source of both (210)Po and (210)Pb for overlying water. The (210)Po profile in the pore waters is apparently correlated with those obtained for Fe, Mn and SO(4)(2)(-), suggesting an influence of early diagenetic processes on the (210)Po solid-liquid distribution. In the sediment, (210)Po is predominantly bound to organic matter or chromium reducible sulphides, and residuals (clay minerals and refractory oxides). Our results indicate that (210)Po is not significantly bound to AVS, i.e. acid volatile sulphides: bioturbation could play a role by the early redistribution of (210)Po bound to acid volatile sulphides in the sediment. (210)Po, (210)Pb and Pb exhibit differences in terms of distribution, probably due to a different mode of penetration in the sediment. This work provides information on solid and liquid distribution of (210)Po and (210)Pb in marine sediment. These data are very scarce in the literature.
采用连续提取方案来测定英吉利海峡中部法国瑟堡道路缺氧海洋沉积物中（210）钋和（210）铅的固相分配。还对孔隙水进行了测量，其中（210）钋活度在1至20毫贝克勒尔每升之间，（210）铅活度在2.4至3.8毫贝克勒尔每升之间，最上层活度最高。这些活度高于海水中的活度，表明沉积物是上覆水体中（210）钋和（210）铅的来源。孔隙水中（210）钋的分布曲线显然与铁、锰和硫酸根（SO₄²⁻）的分布曲线相关，这表明早期成岩过程对（210）钋的固液分布有影响。在沉积物中，（210）钋主要与有机物或可被铬还原的硫化物以及残渣（粘土矿物和难熔氧化物）结合。我们的结果表明，（210）钋与酸挥发性硫化物（AVS）的结合并不显著：生物扰动可能通过使沉积物中与酸挥发性硫化物结合的（210）钋早期重新分布而发挥作用。（210）钋、（210）铅和铅在分布方面存在差异，可能是由于它们在沉积物中的渗透方式不同。这项工作提供了海洋沉积物中（210）钋和（210）铅的固液分布信息。这些数据在文献中非常稀少。
