贵州兴仁滥木厂汞铊矿区优势植物及其根际土壤稀土元素地球化学特征  

Geochemical Characteristics of Rare Earth Elements in Dominant Plants and Rhizosphere Soils in Lanmuchang Mercury-Thallium Mine Area from Xingren County,Guizhou Province,China

作　　者：苟体忠 曾珠亮 申敏 Gou Tizhong;Zeng Zhuliang;Shen Min(School of Science,Kaili University,Kaili 556011,China)

机构地区：[1]凯里学院理学院,贵州凯里556011

出　　处：《山东化工》2024年第18期266-270,275,共6页Shandong Chemical Industry

基　　金：凯里学院博士发展专项基金(BSFZ202205)。

摘　　要：为了研究贵州省兴仁市滥木厂汞铊矿区优势植物及其根际土壤稀土元素地球化学特征,采集了研究区9种优势植物不同部位及其根际土壤样品,采用同位素稀释-电感耦合等离子体质谱法(ID-ICP-MS)测定了样品中的稀土元素含量,并结合单项污染指数法、富集系数法和转运系数法分别讨论了研究区土壤稀土元素的污染水平以及植物对稀土元素的富集和转运特征。结果表明,研究区土壤样品的轻稀土元素总量平均值(∑LREE=342.7644 mg/kg)大于贵州省土壤轻稀土总量平均值(∑LREE=198.6000 mg/kg),重稀土元素总量平均值(∑HREE=33.8367 mg/kg)也高于贵州省土壤重稀土总量平均值(∑HREE=19.9700 mg/kg),轻重稀土比值的平均值(∑LREE/∑HREE=10.1614)也高于贵州省土壤(∑LREE/∑HREE=9.9449),总体表现出轻稀土富集的特征。土壤中的Eu处于轻度-中度污染水平,Pr、Nd、Sm、Gd和Tb处于轻微-轻度污染水平,其他稀土元素均处于轻微污染水平。芒萁的地上部分稀土元素含量高于根部稀土元素含量,其他植物的地上部分稀土元素含量均小于根部稀土元素含量。所有植物根部、地上部分的镧系元素配分模式与土壤的镧系元素配分模式基本一致,表明稀土元素在植物中运移时未发生明显分馏作用。稀土元素在所有研究植物中的生物富集系数(BCF_(shoot)和BCF_(root))均远小于1,表明所有研究植物的根部和地上部分对稀土元素的富集能力均较弱。To study the geochemical characteristics of rare earth elements in the dominant plants and their rhizosphere soil in Hg-Tl mining area of Lanmuchang,Xingren City,Guizhou Province,different parts of nine dominant plant parts and their rhizosphere soil samples were collected in the study area.The content of rare earth elements in the samples was determined by isotope dilution-inductively coupled plasma mass spectrometry(ID-ICP-MS).Combined with the single pollution index method,enrichment coefficient method and transport coefficient method,the pollution level of soil rare earth elements in the study area and the enrichment and transport characteristics of rare earth elements by plants were discussed respectively.The results showed that the average total amount of soil light rare earth elements(∑LREE=342.7644 mg/kg)in the study area was higher than that in Guizhou Province(∑LREE=198.6000 mg/kg),and the average total amount of soil heavy rare earth elements(∑HREE=33.8367 mg/kg)was also higher than that in Guizhou Province(∑HREE=19.9700 mg/kg).The average value of light and heavy rare earth ratio(∑LREE/∑HREE=10.1614)was also higher than that of Guizhou soil(∑LREE/∑HREE=9.9449),which showed the characteristics of light rare earth enrichment.Eu in the soil was at a mild-moderate pollution level,Pr,Nd,Sm,Gd and Tb were at a mild-mild pollution level,and other rare earth elements wre at a mild pollution level.The content of rare earth elements in the aboveground part of Dicranopteris pedata was higher than that in the root,and the content of rare earth elements in the aboveground part of other plants was less than that in the root.The lanthanide distribution patterns of all plant roots and aboveground parts were basically consistent with the lanthanide distribution patterns of soil,indicating that rare earth elements did not undergo significant fractionation during migration in plants.The bioconcentration factors(BCF_(shoot)and BCF_(root))of rare earth elements in all studied plants were far less than 1,in

关 键 词：滥木厂 汞铊矿区 土壤 植物 稀土元素 

分 类 号：X53[环境科学与工程—环境工程]