Characteristics of Rare Earth Elements in the Sediments of the Datong Basin and Its Indication to the Iodine Enrichment
Zhou Hailing
Su Chunli
Li Junxia
Xie Xianjun
Abstract：Under arid and semi-arid climate,high iodine concentration in groundwater of the Datong basin,has been a serious threat to the safety of drinking water for the residents.Sediments composition and rare earth elements (REE) were studied on the 300 m core samples from iodine-affected area of the Datong basin.Results show that the groundwater system in the study area is alkalescent (pH:7.18～9.64) partial reductive environment,and sediments show the slightly negative anomalies of Ce and Eu.The content of iodine in sediments is 0～1.78 × 10-6.The content of ΣREE are high and the ΣLREE/ΣHREE ratios are 2.79～4.14,which means samples are enriched in LREE and depleted in HREE.There is a negative relationship between the concentrations of ΣREE and iodine.Although the reductive dissolution of the iron oxide / hydroxide mineral can result in the release of them,strong absorption of iodine by the low crystallinity minerals produced by sedimentary organic matter makes the iodine content in sediments higher.In slightly weak alkaline environment,the process of REE re-adsorption might attributed to the enrichment of LREE in sediments.The relationship between iodine contents and redox sensitive components (TOC,U,V and [Eu]N show that the redox conditions and organic matter content in groundwater system are important factors that affect the concentration of iodine.
Keywords：groundwaterrare earth elements (REE)iodinegeochemistryredox reactionDatong basinsediments
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 298-306 )