SuperLig~?620用于水中~(90)Sr含量的监测方法研究
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摘要
为实现水中~(90)Sr的连续监测,利用SuperLig~?620固相萃取颗粒从水中选择性分离和富集~(90)Sr,并通过塑料闪烁体测量SuperLig~?620色层柱上~(90)Sr的含量。研究了0.2mg/L Sr-0.01mol/L HNO_3介质下,~(90)Sr在SuperLig~?620色层柱上的动态平衡。结果表明,吸附平衡时~(90)Sr在两相间的浓度呈正比,因此通过测量柱上~(90)Sr的含量可得到水中~(90)Sr的浓度。所建立的方法对~(90)Sr的探测效率和最小可探测活度分别为21.3%和2.6Bq/L,对某低放废水中~(90)Sr的分析误差小于20%。
In order to achieve continuous monitoring of ~(90)Sr in aqueous solution,~(90)Sr was firstly separated selectively and enriched by SuperLig~?620solid phase extraction beads,which was then measured in-situ using plastic scintillator.The influences of ~(90)Sr activity on two-phase equilibrium were studied and the results show that the concentration in aqueous solution is directly proportional to that captured on the column in0.2mg/L Sr-0.01mol/L HNO_3 medium.So the concentration of ~(90)Sr in aqueous solution can be analyzed by detecting ~(90)Sr on the column.The detection efficiency and minimum detectable activity are 21.3% and 2.6Bq/L,respectively.The concentration of~(90)Sr in low level radioactive waste water was analyzed using the above method and the analytical error is lower than 20%.
In order to achieve continuous monitoring of ~(90)Sr in aqueous solution,~(90)Sr was firstly separated selectively and enriched by SuperLig~?620solid phase extraction beads,which was then measured in-situ using plastic scintillator.The influences of ~(90)Sr activity on two-phase equilibrium were studied and the results show that the concentration in aqueous solution is directly proportional to that captured on the column in0.2mg/L Sr-0.01mol/L HNO_3 medium.So the concentration of ~(90)Sr in aqueous solution can be analyzed by detecting ~(90)Sr on the column.The detection efficiency and minimum detectable activity are 21.3% and 2.6Bq/L,respectively.The concentration of~(90)Sr in low level radioactive waste water was analyzed using the above method and the analytical error is lower than 20%.
引文
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[2]SUNDENMAND D N,MEINKE C W.The radiochemistry of calcium strontium and barium,NAS-NS-3010[R].USA:AEC,1960.
[3]弋昌厚,李福德,张荣德.HDEHP萃取测定锶-90的研究:正交实验选择HDEHP萃取的最佳条件[J].科学通报,1979,24(4):160-166.YI Changhou,LI Fude,ZHANG Rongde.Determination of 90Sr using HEDHP Extraction:Optimization of HDEHP extraction conditions using orthogonal experimental design[J].Chinese Science Bulletin,1979,24(4):160-166(in Chinese).
[4]TERA F,MORRISON G H.Radiochemical separations by isotopic ion exchange[J].Analytical Chemistry,1966,38(8):959-964.
[5]EGOROV O B,AND M J O,GRATE J W.Equilibration-based preconcentrating minicolumn sensors for trace level monitoring of radionuclides and metal ions in water without consumable reagents[J].Analytical Chemistry,2006,78(15):5 480-5 490.
[6]DEVOL T A,DUFFEY J M,PAULENOVA A J.Combined extraction chromatography and scintillation detection for off-line and on-line monitoring of strontium in aqueous solutions[J].Journal of Radioanalytical and Nuclear Chemistry,2001,249(2):295-301.
[7]EGOROV O B,O’HARA M J,GRATE J W,et al.Radiochemical sensor system for the analysis of 99 Tc(Ⅶ)in groundwater[J].Journal of Radioanalytical and Nuclear Chemistry,2005,264(2):495-500.
[8]O’HARA M J,BURGE S R,GRATE J W.Quantification of technetium-99 in complex groundwater matrixes using a radiometric preconcentrating minicolumn sensor in an equilibrationbased sensing approach[J].Analytical Chemistry,2009,81(3):1 068-1 078.
[9]郭景儒.裂变产物分析技术[M].北京:原子能出版社,2008:167.
[10]宋志君,张生栋,丁有钱,等.90Sr在SuperLig?620固相萃取颗粒上的吸附性能研究[J].原子能科学技术,2016,50(10):1 741-1 747.SONG Zhijun,ZHANG Shengdong,DING Youqian,et al.Adsorption of 90Sr on SuperLig?620solid phase extraction beads[J].Atomic Energy Science and Technology,2016,50(10):1 741-1 747(in Chinese).
[11]王金山.放射性废水的排放标准[J].原子能科学技术,1986,20(5):569-572.WANG Jinshan.Standards of discharge for radioactive waste water:Investigation on derived water concentration(DWC)and standards of discharge[J].Atomic Energy Science and Technology,1986,20(5):569-572(in Chinese).
[12]ASTM D5811—2008 Standard test method for strontium-90in water[S].US:ASTM,2008.