首页|以DGA树脂法分析海水90Sr的若干问题探讨

以DGA树脂法分析海水90Sr的若干问题探讨

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海水90Sr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90Sr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90Sr和子体90Y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)90Sr-90Y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90Sr全流程的化学回收率在70%以上.
Study on several issues related to 90Sr activity detection in seawater using DGA resin method
Artificial radionuclide 90Sr 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always been one of the important nuclides in marine radioactivity monitoring surveys.Due to systematic issues such as outdated methods,poor decontamination effectiveness,and long analysis cycles,there are problems with the current methods.In this study,we investigated several issues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 90Sr in seawater,such as co-precipitation and DGA separation effecting on quantitative separation of Sr,the impact of the waiting time after 90Sr-90Y 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 weak carrier abilities for strontium,up to 97%of strontium in seawater is retained in the supernatant of iron hydroxide co-precipitation,indicating that 90Sr-90Y disequilibrium occurred after iron hydroxide co-precipitation enrichment;(2)The DGA resin has weak strontium adsorption properties,with over 90%of enriched residual strontium being removed during the DGA resin rinsing with sample solution;(3)The waiting time from 90Sr-90Y separation to measurement should be controlled within 20-40 hours;(4)20 mL of 0.25 M hydrochloric acid is 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.

DGA resinseawater90Sr90Yartificial radionuclides

赵峰、谷河泉、倪志鑫、吴梅桂、郑远来、赵力、周鹏、李冬梅

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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

DGA树脂 海水 90Sr 90Y 人工放射性核素

广东省平台基地及科技基础条件建设项目中国海洋发展基金会项目国家海洋局南海分局海洋科学技术局长基金项目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自然资源部南海局科技发展基金项目广东省应用海洋生物学重点实验室开放基金

2021B1212050025CODF-002-ZX-2021180104MESTA-2021-D006230201LAMB20221007

2024

海洋环境科学
国家海洋局海洋环境保护研究所 国家海洋环境监测中心 中国海洋科学学会

海洋环境科学

CSTPCD北大核心
影响因子：0.66
ISSN：1007-6336
年,卷(期)：2024.43(1)
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