ICP-MS测量天然淡水中的226 Ra  

ICP-MS for Determination of ^(226)Ra in Natural Freshwaters

作　　者：黄雯娜 许宏 郭秋菊[2] HUANG Wen-na;XU Hong;GUO Qiu-ju(Zhejiang Province Radiation Environmental Monitoring Center,Hangzhou 310012,China;Nation Key Laboratory of Nuclear Physics and Technology, School of Physics,Perking University,Beijing 100871,China)

机构地区：[1]浙江省辐射环境监测站,浙江省辐射环境安全监测重点实验室,浙江杭州310012 [2]北京大学物理学院,核物理与核技术国家重点实验室,北京100871

出　　处：《核化学与放射化学》2018年第5期324-329,共6页Journal of Nuclear and Radiochemistry

基　　金：浙江省公益技术应用研究(分析测试)计划项目(No.2016C37014)

摘　　要：^(226) Ra是一种极毒的α放射性核素,是辐射环境监测中重点关注的核素之一。本工作建立了一种利用电感耦合等离子体质谱(ICP-MS)对天然淡水中^(226 )Ra快速定量分析的方法。对500mL的水样进行浓缩后,利用AG 50W-X8离子交换树脂和Sr萃取树脂分离基体质谱测量干扰元素(Ca、K、Mg、Na、Sr、Ba等),随后利用ICP-MS对^(226 )Ra进行定量分析。样品分析结果显示,^(226 )Ra全程加标回收率为90%~95%,^(226 )Ra的方法检测限为0.04pg/L(1.46mBq/L,n=10),整个流程耗时约10h。该方法实现了样品中^(226 )Ra的快速准确测量,为日常预警监测以及特殊情况应急中^(226) Ra监测提供了一条快捷可靠的途径。Due to the chemical toxicity and radioactivity(αemitter),226 Ra is one of the most important radionuclide for the environmental radioactivity monitoring.Herein,a rapid method for the determination of 226 Ra in natural freshwaters by inductively coupled plasma mass spectrometry(ICP-MS)was established.In general,after the pre-concentration of water sample from 500 mL to 15 mL,separation of Ra from these potential interfering elements(i.e.Ca,K,Mg,Na,Sr and Ba)was achieved using AG 50W-X8 ion exchange resins and Sr-resin,followed by the ICP-MS measurement.Results of four natural freshwater samples show that the 226 Ra recovery range from 90%to 95%,and the detection limit of the methodology is determined to be 0.04 pg/L(1.46 mBq/L,n=10)for 500 mL sample.Compared to conventional radiometric techniques,the as-established method greatly shortens the analytical time for 226 Ra determination(about 10 h),providing a rapid and reliable way for the determination of 226 Ra in daily monitoring and emergency response.

关 键 词：ICP-MS 天然淡水 226RA 

分 类 号：X832[环境科学与工程—环境工程] O614.234[理学—无机化学]