【摘要】：大同盆地是典型的干旱-半干旱內(nèi)陸盆地,盆地中部地下水碘含量異常,對(duì)當(dāng)?shù)仫嬘盟踩斐闪藝?yán)重威脅.對(duì)盆地高碘地下水分布區(qū)沉積物組成及稀土元素(REE)進(jìn)行了地球化學(xué)研究,結(jié)果表明,地下水系統(tǒng)呈弱堿性(pH值為7.18~9.64)的偏還原環(huán)境,沉積物多為Ce正常或輕微負(fù)異常及Eu負(fù)異常;沉積物中碘含量為0~1.78×10~(-6);ΣREE含量較高,ΣLREE/ΣHREE比值為2.79~4.14,即富集輕稀土元素(LREE)而虧損重稀土元素(HREE).ΣREE與碘含量呈負(fù)相關(guān)關(guān)系,雖然鐵氧化物/氫氧化物礦物的還原性溶解可導(dǎo)致二者的釋放,但由于沉積物有機(jī)質(zhì)產(chǎn)生的低結(jié)晶礦物對(duì)碘的強(qiáng)吸附性,使沉積物中碘含量較高;弱堿性環(huán)境中REE的再吸附過程會(huì)導(dǎo)致沉積物中富集LREE;沉積物中碘含量與氧化還原敏感組分TOC、U、V及[Eu]N的關(guān)系也表明,地下水系統(tǒng)的氧化還原條件及有機(jī)質(zhì)含量是影響碘富集的重要因素.
[Abstract]:Datong basin is a typical arid-semi-arid inland basin. The anomaly of iodine content in groundwater in the central part of the basin poses a serious threat to the safety of local drinking water. The composition of sediments and rare earth elements (REE) in the area of high iodine groundwater distribution in the basin are studied. The results show that the groundwater system shows a weak alkaline (pH 7.189.64) partial reduction environment, and the sediments are mostly ce normal or slight negative anomalies and EU negative anomalies. The iodine content in sediment is 0 ~ 1.78 脳 10 ~ (-6), 危 REE content is high, 危 LREE / 危 hree ratio is 2.79 ~ 4.14, that is, enriched light rare earth element (LREE) and depleted heavy rare earth element (hree). 危 REE is negatively correlated with iodine content, although the reductive dissolution of iron oxide / hydroxide mineral may lead to their release. However, due to the strong adsorption of iodine by the low crystalline minerals produced by organic matter in sediments, the iodine content in sediments is higher. The readsorption process of REE in weakly alkaline environment will lead to the enrichment of LREE in sediments, and the relationship between iodine content in sediments and the sensitive components of redox, TOCX UV and [EU] N, also indicates that the readsorption process of REE in sediments may lead to the enrichment of LREE in sediments. The redox conditions and organic matter content of groundwater system are important factors affecting iodine enrichment.
【作者單位】： 中國地質(zhì)大學(xué)環(huán)境學(xué)院;中國地質(zhì)大學(xué)生物地質(zhì)與環(huán)境地質(zhì)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(No.41502230)
【分類號(hào)】：P641.3

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