This study focuses on the determination of field solid/liquid ratios (Rd) values of trace element (TE) and radionuclide (RN) in the Seine River (France) during a concerted low radioactivity level liquid regulatory discharge performed by a Nuclear Power Plant (NPP) and their confrontation with Kd values calculated from geochemical modeling. This research focuses on how field Rd measurements of TE and RN can be representative of Kd values and how Kd models should be improved.

For this purpose 5 sampling points of the Seine River during a NPP's liquid discharge were investigated: upstream from the discharge in order to assess the natural background values in the area of effluent discharge, the total river water mixing distance (with transect sampling), and 2 points downstream from this last area. The main parameters required determining field Rd of TE and RN and their geochemical modeling (Kd) were acquired. Filtered waters were analyzed for alkalinity, anions, cations, dissolved organic carbon (DOC), TE, and RN concentrations. Suspended particulate matter (SPM) was analyzed for particulate organic carbon (POC), TE and RN concentrations and mineralogical composition. Field Rd and Kd values are in good agreement for stable Cd, Cu, Ni, Pb and Zn and for ⁷Be. Conversely, measured field Rd for stable Ag, Ba, Sr, Co and Cs are systematically higher than modeled Kd values. Even if only the lowest possible values were obtained for ¹³⁷Cs and ⁶⁰Co Rd measurements, these estimated limits are higher than calculated Kd for ¹³⁷Cs and in good agreement for ⁶⁰Co. Finally, only two RN exhibit field Rd lower than calculated Kd: ²³⁴Th and ²¹⁰Pb.

Comparison of field Rd vs. modeled Kd values for TE and RN allows the identification, for each element, of the main involved adsorption phases and geochemical mechanisms controlling their fate and partitioning in river systems.

这项研究的重点是在核电厂进行的一致的低放射性水平液体监管排放期间，确定塞纳河（法国）中痕量元素（TE）和放射性核素（RN）的现场固/液比（Rd）值（ NPP）及其与根据地球化学模型计算得出的Kd值的对抗。这项研究的重点是TE和RN的现场Rd测量如何代表Kd值以及如何改进Kd模型。

为此，在核电厂的液体排放过程中，对塞纳河的5个采样点进行了调查：在排放上游，以评估污水排放区域的自然本底值，总河水混合距离（采用样线采样）和最后一个区域的下游2分。获取了确定TE和RN的场Rd所需的主要参数及其地球化学模型（Kd）。分析滤过水的碱度，阴离子，阳离子，溶解的有机碳（DOC），TE和RN浓度。分析悬浮颗粒物（SPM）的颗粒有机碳（POC），TE和RN浓度以及矿物学组成。对于稳定的Cd，Cu，Ni，Pb和Zn以及^7的场，Rd和Kd值非常吻合是。相反，稳定的Ag，Ba，Sr，Co和Cs的实测场Rd系统上高于模型Kd值。即使仅获得最低的可能值¹³⁷ Cs和^60次录测量，这些估计的限制比计算的Kd更高的¹³⁷ Cs和良好的一致性为⁶⁰有限公司最后，只有两个RN展览场路比计算Kd低：²³⁴ Th和²¹⁰ Pb。

通过比较TE和RN的场Rd与模型Kd值，可以确定每种元素的主要吸附相以及控制其命运和在河流系统中分配的地球化学机制。