摘要
稀土元素是茶叶中检出率较高的元素之一.因此,对凤庆县大寺乡茶园土壤中的16种稀土元素(氧化物)含量和形态分布进行了分析,结果表明,土壤中16种稀土元素氧化物含量的顺序为:w(CeO2)>w(La2O3)>w(Y2O3)>w(Nd2O3)>w(Sc2O3)>w(Pr6O11)>w(Sm2O3)>w(Dy2O3)>w(Gd2O3)>w(Er2O3)>w(Yb2O3)>w(Eu2O3)>w(Ho2O3)>w(Tb4O7)>w(Lu2O3)>w(Tm2O3),符合“奥多-哈根斯法则”.轻稀土和重稀土氧化物含量的比值为3.217,HREE发生了明显的分馏,LREE则有富集的倾向.比较而言,除残渣态外,非晶型铁锰氧化物结合态和晶型铁锰氧化物结合态是LREE的主要赋存形态,而非晶型铁锰氧化物结合态、晶型铁锰氧化物结合态和有机结合态均是HREE的主要赋存形态.
Rare earth elements (REEs) are one of the elements which are among the most frequently detected metals in tea leaves. In this paper, the concentrations and speciation distributions of REEs (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y and Sc) in a typical tea garden soil, collected from Dasi Township in Fengqing country, were analyzed. The results indicated the descending order of concentrations of the rare earth elements oxides is as follows: w ( CeO2 )> w ( La2O3)> w ( Y2O3 )> w ( Nd2O3 )> w ( Sc2O3 )> w ( Pr6O11 )> w ( Sm2O3 )> w ( Dy2O3 )> w ( Gd2O3 )> w ( Er2O3 )> w ( Yb2O3 )> w ( Eu2O3 )> w ( Ho2O3 )> w ( Tb4O7 )> w ( Lu2O3 )> w ( Tm2O3 ), which conforms to the Oddo-Hagens Rule. The ratio of oxide content of light rare earth elements (LREE) to heavy rare earth elements (HREE) is 3.217 indicating the obvious HREE fractionates, while the LREE tends to be enriched. In contrast, besides the residual fraction, the Fe/Mn-oxyhydroxides bounded fractions (Non-crystalline Fe/Mn and crystalline Fe/Mn bounded fractions) are the main fractions of LREE, while both the Fe/Mn-oxyhydroxides bounded fractions and organic bounded fraction are the main fractions of HREE.
作者
肖涵
鲁翼岚
缪德仁
XIAO Han;LU Yilan;MIAO Deren(College of Chemistry & Chemical Engineering,Kunming University,Kunming,Yunnan,China 650214)
出处
《昆明学院学报》
2019年第3期48-51,共4页
Journal of Kunming University
基金
云南省高校食品安全检测技术重点实验室建设项目
关键词
凤庆县
茶园土壤
稀土元素
形态分布
Fengqing county
tea garden soil
rare earth elements
speciation distributions
