以DGA树脂法分析海水^(90)Sr的若干问题探讨  

Study on several issues related to ^(90)Sr activity detection in seawater using DGA resin method

作　　者：赵峰[1] 谷河泉[1] 倪志鑫[1] 吴梅桂[1] 郑远来[1] 赵力[1] 周鹏[1] 李冬梅[1] ZHAO Feng;GU Hequan;NI Zhixin;WU Meigui;ZHENG Yuanlai;ZHAO Li;ZHOU Peng;LI Dongmei(South China Sea Environment Monitoring Center,State Oceanic Administration,Nansha Islands Coral Reef Ecosystem National Observation and Research Station,Key Laboratory of Marine Environmental Survey Technology and Application,Ministry of Natural Resources,Guangzhou 510300,China)

机构地区：[1]国家海洋局南海环境监测中心,海南南沙珊瑚礁生态系统国家野外科学观测研究站,自然资源部海洋环境探测技术与应用重点实验室,广东广州510300

出　　处：《海洋环境科学》2024年第1期130-135,共6页Marine Environmental Science

基　　金：广东省平台基地及科技基础条件建设项目(2021B1212050025);中国海洋发展基金会项目(CODF-002-ZX-2021);国家海洋局南海分局海洋科学技术局长基金项目(180104);自然资源部海洋环境探测技术与应用重点实验室自主设立课题(MESTA-2021-D006);自然资源部南海局科技发展基金项目(230201);广东省应用海洋生物学重点实验室开放基金(LAMB20221007)。

摘　　要：海水^(90)Sr一直是海洋放射性监测调查的重要核素之一。由于现行分析方法老旧、去污效果差、分析周期长等问题,本文对以DGA树脂法分析海水^(90)Sr业务化推广时遇到的若干问题进行研究,如富集共沉淀和DGA分离流程对锶的定量分离、锶-钇分离后搁置对最终结果的影响、DGA纯化流程对钇的定量分离以及全流程回收率等。结果表明:(1)氢氧化铁和氟化钙对锶的载带能力均较弱;高达97%海水锶保留在氢氧化铁共沉淀的上清液里,这表明母体^(90)Sr和子体^(90)Y在氢氧化铁共沉淀富集后开始分离。(2)DGA树脂对锶吸附性较弱,样品液流洗DGA树脂时已去除90%以上富集残留锶。(3)^(90)Sr-^(90)Y分离至测量的搁置时间应控制在20~40 h。(4)20 mL 0.25 M盐酸足以洗脱10 mg钇并消除钇在树脂上的残留。(5)以DGA树脂法测定海水中的^(90)Sr全流程的化学回收率在70%以上。Artificial radionuclide ^(90)Sr in seawater has always been one of the important nuclides in marine radioactivity monitoring surveys.Due to systematic issues such as outdated methods,poor decontamination effectiveness,and long analysis cycles,there are problems with the current methods.In this study,we investigated several issues encountered during the application of the DGA resin method to analyze ^(90)Sr in seawater,such as co-precipitation and DGA separation effecting on quantitative separation of Sr,the impact of the waiting time after ^(90)Sr-^(90)Y separation,DGA purification ability for Y separation,and the recovery rate for entire process.The results indicate that:(1)Both iron hydroxide and calcium fluoride have relatively weakcarrier abilities for strontium,up to 97%of strontium in seawater is retained in the supernatant of ironhydroxide co-precipitation,indicating that ^(90)Sr-^(90)Y disequilibrium occurred after iron hydroxide co-precipitationenrichment;(2)The DGA resin has weak strontium adsorption properties,with over 90%of enriched residualstrontium being removed during the DGA resin rinsing with sample solution;(3)The waiting time from ^(90)Sr-^(90)Y separation to measurement should be controlled within 20-40 hours;(4)20 mL of 0.25 M hydrochloric acidis sufficient to elute 10 mg of yttrium and eliminate residual yttrium on the resin;(5)For the seawater samples,above 70%of the overall chemical recovery rate may be obtained using the DGA resin method.

关 键 词：DGA树脂 海水 ^(90)Sr ^(90)Y 人工放射性核素 

分 类 号：P734.4[天文地球—海洋化学] X125[天文地球—海洋科学]