Simulation of transport mechanism of radium isotopes in aquifer on the southern coast of Laizhou Bay  

作　　者：Yancheng Wang Guangquan Chen Hongjun Yu Xingyong Xu Yinqiao Zou Wenqing Zhao Weitao Han Wenzhe Lyu Zhen Cui Runtian Ding 

机构地区：[1]Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China [2]Laboratory for Marine Geology,Laoshan Laboratory,Qingdao 266237,China [3]Fourth Institute of Oceanography,Ministry of Natural Resources,Beihai 536000,China [4]Weifang Institute of Marine Development,Weifang 261041,China [5]State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China [6]Qingdao Hailukong Environmental Automatic-control Engineering Co.,Ltd.,Qingdao 266000,China

出　　处：《Acta Oceanologica Sinica》2023年第8期40-48,共9页海洋学报（英文版）

基　　金：The Joint Funds of the National Natural Science Foundation of China under contract Nos U22A20580 and U2106203;the National Natural Science Foundation of China under contract No.41706067;the Open Project Program of Key Laboratory of Ecological Warning,Protection&Restoration for Bohai Sea,Ministry of Natural Resources under contract No.2022108.

摘　　要：Naturally occurring radium(^(223)Ra,^(224)Ra,^(226)Ra,and^(228)Ra)isotopes have been widely applied as geochemical tracers in marine environments,especially when estimating the submarine groundwater discharge(SGD).In this sense,the influencing factors and transport mechanism of radium isotope activity in aquifers can be key information for SGD estimation.This work evaluates the adsorption/desorption behavior of^(224)Ra and^(226)Ra in the solid-liquid phase through a leaching experiment and analysis of field data.The results suggested that radium isotope activity was positively correlated with salinity and grain size,in the case of abundant sediments.Through ion analysis,we found that the ions(Na^(+),Ca^(2+),Mg^(2+),and Ba^(2+))exchanged with radium isotopes in the process of transport.A 1-D reactive transport model was established to simulate the transport process of radium isotope in aquifers.The model successfully simulated the variation of radium isotope desorption activity with salinity and was subsequently verified in the field.This study contributes to the understanding of the geochemical behavior of radium isotopes in aquifers and provides guidance for selecting a suitable groundwater endmember in SGD estimation.

关 键 词：RADIUM adsorption/desorption behavior leaching experiment reactive transport model coastal aquifer Laizhou Bay 

分 类 号：P641.2[天文地球—地质矿产勘探] P736.4[天文地球—地质学]