固相萃取-液闪测量快速测定土壤样品中铅-210

利用浓硝酸加热浸取富集土壤样品中的铅,利用铅特效树脂吸附、柠檬酸溶液解吸,采用ICP-AES测量铅的化学回收率,液闪谱仪测量铅-210的活度浓度,建立了一种土壤样品中铅-210的快速分析方法。当土壤样品用量为1.0 g,测量时间为60 min时,方法的探测下限为24.8 Bq/kg,方法精密度为4.8%,加标回收率范围为100.1%~102.6%。本方法可以满足土壤样品中铅-210的分析要求。

Rapid determination of lead-210 in soil sample using solid phase extraction and liquid scintillation counting method

A rapid analysis method of Lead-210 in soil sample was established by using solid phase extraction and liquid scintillation counting method. The lead in soil sample was enriched by concentrated nitric acid heating extraction method. The lead specific resin was used as an adsorbent, and citric acid solution was used for desorption. The chemical recovery rate of lead was measured by ICP-AES and the activity concentration of Lead-210 was measured by liquid scintillation spectrometer. When the amount of soil sample was 1.0 g and the measuring time was 60 minutes, the minimum detectable concentration of this method was 24.8 Bq/kg and the precision of this method was 4.8%, and the recovery rate of this method was 100.1%-102.6%, which met the requirement of Lead-210 analysis in soil sample.