摘要
目的 为评估我国环境放射性安全水平,监测我国部分海域海产品中的Sr-90放射性水平,并对二-(2-乙基己基)磷酸(HDEHP)萃取色层法分析海产品中Sr-90的方法进行优化。方法 采集2023年我国山东(黄渤海水域)和海南(南海水域)鱼、虾、贝、藻等共5类海产品,用电感耦合等离子体发射光谱仪(ICP-AES)测定样品中Sr含量,利用HDEHP萃取色层法进行样品中Sr-90的分离与测量,用重量法和ICP-AES方法进行分析流程回收率的测定。结果 海产品中锶的含量差异较大,过量的锶和钙元素可能会由于HDEHP萃取色层分离时淋洗不充分导致回收率偏高,需对洗脱液中的钇含量进行ICP分析,我国山东海域海产品中Sr-90活度浓度范围为0.22~1.85 Bq/kg(干重),海南海域海产品中Sr-90活度浓度范围为0.19~1.82 Bq/kg(干重)。结论 对于虾和海藻类样品,需结合重量法和ICP辅助方法进行Sr-90分析流程回收率的测定;海产品中Sr元素含量与Sr-90活度浓度并无明显的线性相关;山东和海南两海域海产品中Sr-90活度浓度无显著差异,全部28份样品活度浓度均未超过《食品中放射性物质限制浓度标准》(GB14882—1994)的限值,处于环境本底波动范围。
Objective:To evaluate the environmental radioactive safety level in China,monitor the radioactivity of strontium-90(90Sr)in seafood from selected marine regions of China,and optimize the di-(2-ethylhexyl)phosphoric acid(HDEHP)extraction chromatography method for determining Sr-90 in seafood.Methods:In 2023,seafoods of fish,shrimp,shellfish,and seaweed were collected from the Shandong Province(Bohai Sea and Yellow Sea)and Hainan Province(South China Sea).The levels of Sr in the samples were determined by inductively coupled plasma atomic emission spectrometer(ICP-AES).The 90Sr separation were performed using HDEHP extraction chromatography,while the recovery of 90Sr were determined by the gravitmetry with the assistant of ICP-AES.Results:The content of strontium in seafoods varies greatly,and excessive strontium and calcium in seafood may lead to overestimated recovery due to insufficient leaching during chromatographic separation by HDEHP extraction.Therefore,the yttrium content in the eluent should be analyzed by ICP.The radioactivity of 90Sr in seafood from the sea areas in Shandong Province was 0.22-1.85 Bq/kg(dry weight),and that of seafood from Hainan Province was 0.19-1.82 Bq/kg(dry weight).Conclusion:For the analysis of shirmp and seaweed samples,the recovery rate of 90Sr should be analyzed using both gravimetry and ICP-AES.There is no significant linear correlation between total Sr and 90Sr in seafood.There is no significant difference in 90Sr radioactivity between the seafood samples collected from Shandong and Hainan.The 90Sr radioactivity levels of all 28 samples are below the limit specified in the Limited concentrations of radioactive materials in foods(GB 14882—1994)and are within the range of environmental background fluctuations.
作者
石岑
谢雨晗
钱宇欣
吉艳琴
Cen SHI;Yuhan XIE;Yuxin QIAN;Yanqin JI(National Institute for Radiological Protection,Chinese Center for Disease Control and Prevention,Key Laboratory ofRadiological Protection and Nuclear Emergency,China CDC,Beijing 100088 China)
出处
《中国辐射卫生》
2025年第2期231-236,共6页
Chinese Journal of Radiological Health
关键词
锶-90
萃取色层法
海产品
放射性测量
Strontium-90
Extraction chromatography
Seafood
Radioactivity measurement
