应用ICP-OES法测定矿区土壤中有价稀土元素含量

Application of ICP-OES method to determine the content of valuable rare earth elements in soil of mining areas

传统测定稀土矿区土壤中稀有元素含量的方法主要采用化学分析法,该方法污染性强,接触过程也容易对结果造成干扰,故本文应用ICP-OES法测定矿区土壤中有价稀土元素含量。测定结果表明:应用所提测试技术测定标准土壤样本,稀土元素回收率均在97%以上,并且当硫酸铵浓度为0.1 g/mL、振荡时间为2 h、波长为414 nm时测定效果更好,能准确完成有价稀土元素含量测量。通过对研究区域各剖面土壤样本进行测定可知,该地区的母质层显示出较好的稀土元素富集趋势。尽管淋溶层和淀积层中稀土元素的含量相对较低,但仍保持在一定水平。这进一步表明该地区具有轻稀土元素富集的特点,具有较好地开采价值。

The traditional method for determining the content of rare elements in the soil of rare earth mining areas mainly adopts chemical analysis,which is highly polluting and the contact process is also prone to interfere with the results.Therefore,this paper applies ICP-OES method to determine the content of valuable rare earth elements in the mining area soil.The measurement results show that the recovery rate of rare earth elements in standard soil samples determined by the proposed test technology is above 97%,and the measurement effect is better when the concentration of ammonium sulfate is 0.1 g/mL,the oscillation time is 2 h,and the wavelength is 414nm,which can accurately complete the measurement of the content of valuable rare earth elements.By measuring the soil samples of various profiles in the study area,it can be seen that the parent material layer in this area shows a good enrichment trend of rare earth elements.Although the content of rare earth elements in the leaching layer and the sedimentary layer is relatively low,it still remains at a certain level.This further indicates that the area is characterized by the enrichment of light rare earth elements and has good mining value.