能量色散X射线荧光光谱法测定土壤和沉积物中稀土元素

Determination of Rare Earth Elements in Soil and Sediment by Polarized Energy Dispersive X-ray Fluorescence Spectrometry

建立了偏振能量色散X射线荧光光谱法测定土壤和沉积物中稀土元素的方法,该方法较传统的方法具有前处理简单、测量自动化程度高、灵敏度高和检出限低(检出限范围为0.05~2.80 mg/kg)等优点。对土壤和沉积物标准物质的测定结果表明:测定结果与认定值能较好吻合,相对标准偏差范围为0.2%~9.4%,能满足测试的需求。分别用该方法和电感耦合等离子体质谱法对实际样品进行测定,2种方法的测定结果有较好的一致性,表明该方法测定结果准确可靠,可用于实际样品的测定。

A method for determination of rare earth elements in soil and sediment by polarization energy dispersion X-ray fluorescence spectrometry with samples preparation of pressed powder pellet was established.Compared with traditional methods,this method has simpler pretreatment,higher automation,higher sensitivity and lower detection limit(the detection limit is 0.05-2.80 mg/kg).The relative standard deviation range of the results was 0.2%-9.4%.The results showed that the method was accurate,precise and could meet the demand of the test.Both this method and Inductively Coupled Plasma Mass Spectrometry were used to determine rare earth elements in soil respectively.The results of the two methods were consistent,which indicated that the method is accurate and reliable,and it can be used for determination of actual samples.