电感耦合等离子体质谱法测定井间示踪剂中稀土元素

Determination of Rare Earth Elements in Inter-well Tracers by Inductively Coupled Plasma-Mass Spectrometry

摘要: 以甲醇为稀释剂，用电感耦合等离子体质谱法快速测定稀土示踪剂中17个稀土元素。研究表明，在优化的稀释剂甲醇浓度为2%（体积分数）、pH<2.47的条件下测定稀土元素，方法精密度（RSD）为1.23%～2.83%，日间6次测定的精密度为2.25%～4.76%，各稀土元素线性关系良好，检出限为2.0～9.0 ng/L；17个稀土元素的加标回收率为85%～108%，满足痕量元素分析要求。

Abstract: A method for rapid determination of 17 rare earth elements in inter-well tracers was established with methanol as dilution reagent. The diluting solution was optimized as containing 2% methanol and pH<2.47. Under this optimized condition, the detection precision was 1.23%～2.83 %RSD and the inter-day precision in six days was 2.25%～4.76%RSD. The linear relationship for all rare earth elements was perfect with detection limits of 2.0～9.0 ng/L. The spike recoveries for 17 rare earth elements were 85%～108%, which satisfied with the demands for trace amount of rare earth element determination.