摘要
为研究包头市南郊污灌区农田表层土壤稀土元素分布特征,对农田土壤按照"梅花形"取样,测定农田土壤稀土元素含量,系统分析土壤稀土全量特征和分馏特征。污灌区农田轻稀土元素总量189.48 mg/kg是河套地区轻稀土背景值总量的1.40倍、重稀土元素总量的12.36倍,∑LREE/∑HREE为11.16～14.47,平均比值为12.36。分馏比值(La/Yb)_N>(La/Sm)_N>(Gd/Yb)_N,δCe的平均值为1.02,0.89<δCe<1.24,局部地方有显著正异常;δEu的平均值为0.69<0.95,为负异常。研究区土壤中稀土元素含量遵循奥多～哈金斯法则,轻、重稀土分馏非常明显,轻稀土元素相对重稀土元素富集度很高,Eu元素相对亏损,Ce元素在局部地方有明显正异常。表现为非常明显的轻稀土富集型。轻稀土元素高度富集预示着外源轻稀土元素对污灌区农田土壤生态环境具有重大影响。
A study was conducted on characteristics of the distribution of the rare earth elements（REE） in the surface soil of the farmland in wastewater irrigation area of Baotou Southern suburbs（SFWA）.Samples were collected by using quincunx to determine the content of REE in the SFWA.The characteristics of the total quantity and fractionation were analyzed systematically.The results indicated that the mean content of light rare earth elements（LREE） in SFWA was 189.48 mg/kg,it was 1.40 times that of background total value in HeTao.The average total content of LREE was 12.36 times that of heavy rare earth elements（HREE）.The value of∑LREE/∑HREE was 11.16-14.47 with an average ratio of 12.36,（La/Yb）_N（La/Sm）_N（Gd/Yb）_N,the average value of 8Ce was1.02 and 0.898Ce1.24,the 8Eu value was 0.69 and lower than 0.95.The content of REE followed the Oddo-Harkin rule strictly.LREE and HREE separated obviously,showing that LREE was highly enriched.Eu showed negative anomaly and Ce showed significant positive abnormal in some places.This showed very significant LREE enrichment type,which indecates that External Rare-Earth has a significant impact on the ecological environment in the SFWA.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2012年第3期614-618,共5页
Acta Agriculturae Universitatis Jiangxiensis
基金
内蒙古自治区高等学校科学研究项目(NJ09142)
包头市科技发展项目(2011S2009-4-3-6)
关键词
稀土元素
分布
表层土壤
农田
污灌区
REE
distribution
surface soil
farmland
wastewater irrigation area.
