摘要
目的建立有效可靠地分析多级大气颗粒物中超痕量铀的方法，为环境大气中放射性铀含量的监测与评价提供快速可靠的分析方法。方法采用撞击式六级空气采样器进行采样，对比纤维素、玻璃纤维和石英3种采样滤膜和4种酸消解体系，选择最优滤膜和消解酸系，利用微波消解．高分辨电感耦合等离子体质谱仪测定颗粒物中超痕量铀的含量。结果纤维素带槽滤膜的铀本底含量最低，优选HNO3-HCI（王水）-H2O2体系消解。利用建立方法分析标准膜（SRM2783）的实验结果相对误差为7％，铀的检出限为2×10^-4ng／m3。应用此方法分析实际PM2.5颗粒物中铀的含量约为0．023～0．065mg／m3。结论建立的方法能够有效监测多级大气颗粒物中超痕量铀的浓度水平，分析方法准确可靠。
Objective To establish an effective and reliable method for analysis of ultratrace uranium in multi-stage atmospheric particles providing the monitoring and evaluation of the content of radioactive uranium in the atmosphere. Methods A large volume six-stage-impactor sampler of atmosphere particles was used to collect aerosol samples, and uhratrace uranium in particles was digested using microwave and measured by inductively coupled plasma mass spectrometry. The filter material, digestion conditions and microwave digestion system had been optimized. Results The background of uranium level on the cellulose filter was the lowest, and the samples were digested by using HNO3-HCl （aqua regia）-H2O2 solution. Reference material SRM2783 was used to validate the accuracy of the method, and the relative error of the 23SU was 7% , The detection limit of the method was 2 ×10-4ng/m3. The aerosol actual samples were analyzed using the established method. The mass concentrations of uranium in PM2.5 was in the range of 0,023 -0. 065 ng/m3. Conclusions The established method was effective and reliable to monitor the concentration level of ultratrace uranium in multi-stage atmospheric particles.
作者
徐颖
尹亮亮
陈飞
邵宪章
孔祥银
吉艳琴
Xu Ying Yin Liangliang Chen Fei Shao Xianzhang Kong Xiangyin Ji Yanqin(Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China)
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2017年第3期212-215,共4页
Chinese Journal of Radiological Medicine and Protection
