地质样品中~(210)Po的测定方法
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摘要
研究了测定地质样品中~(210)Po的适宜条件,并对测定~(210)Po的干扰因素进行了讨论。在盐酸浓度0.5mol/L、溶液体积40mL、水浴温度80℃、振荡频率140次/min、振幅20mm、反应时间2.5h的条件下,~(210)Po可定量自沉积于直径20mm的铜片上。通过测量铜片上的总α放射性活度,可求出样品中~(210)Po的比活度。在自沉积反应体系中,加入抗坏血酸还原Fe3+等高价金属离子,以保护铜片不被腐蚀。~(210)Po活度与总α净计数率的线性相关系数为0.999 8,测定方法的加标回收率为98.3%～101.5%。
The optimum conditions for the determination of ~(210)Po in geological samples were studied systematically.The interference factors for the determination of ~(210)Po were discussed.Under the condition of hydrochloric acid concentration of 0.5mol/L,solution volume of 40 mL,water bath temperature of 80 ℃,oscillation frequency of 140times/min,amplitude of 20 mm,the reaction time of2.5h,~(210)Po can deposit on the copper sheet of 20 mm diameter quantitatively.By measuring the total alpha activity on the copper,the specific activity of ~(210)Po is obtained.In the reaction system,high-value metal ions such as Fe3+were reduced by ascorbic acid to protect the copper sheet from corrosion.The linear correlation coefficient between the activity of ~(210)Po and the total alpha net count rate was0.999 8,and the standard recovery was 98.3%to 101.5%.
The optimum conditions for the determination of ~(210)Po in geological samples were studied systematically.The interference factors for the determination of ~(210)Po were discussed.Under the condition of hydrochloric acid concentration of 0.5mol/L,solution volume of 40 mL,water bath temperature of 80 ℃,oscillation frequency of 140times/min,amplitude of 20 mm,the reaction time of2.5h,~(210)Po can deposit on the copper sheet of 20 mm diameter quantitatively.By measuring the total alpha activity on the copper,the specific activity of ~(210)Po is obtained.In the reaction system,high-value metal ions such as Fe3+were reduced by ascorbic acid to protect the copper sheet from corrosion.The linear correlation coefficient between the activity of ~(210)Po and the total alpha net count rate was0.999 8,and the standard recovery was 98.3%to 101.5%.
引文
[1]马崇智.放射性同位素手册[M].北京:科学出版社,1979:78-80.
[2]祝霖主.放射化学[M].北京:原子能出版社,1985:158-196.
[3] MACKENZIE A B,SCOTT R D.Separation of Bismuth-210and Polonium-210from aqueous solutions by spontaneous adsorption on copper foils[J].Analyst,1979,104(1245):1151-1158.
[4]张庆文.岩石土壤样品中210Po的测定[J].铀矿分析工艺,1981(1):1-8.
[5]张庆文,吕应松.铀矿样品中210 Po的测定[J].铀矿分析工艺,1981(1):93-94.
[6]廖运璇,张露.环境介质中210 Po的分析测定[J].铀矿冶,2013,32(4):221-223.
[7]王玉学.岩石、土壤样品中210 Po测定方法的研究[J].铀矿地质,2005,21(4):248-256.
[8]王玉学,郭冬发,王哲,等.210 Po、210 Bi和210 Pb测试技术研究进展与现状[J].铀矿地质,2014,30(4):242-249.
[9]朱元保,沈子琛,张传福,等.电化学数据手册[M].长沙:湖南科学技术出版社,1985:198-217.
[2]祝霖主.放射化学[M].北京:原子能出版社,1985:158-196.
[3] MACKENZIE A B,SCOTT R D.Separation of Bismuth-210and Polonium-210from aqueous solutions by spontaneous adsorption on copper foils[J].Analyst,1979,104(1245):1151-1158.
[4]张庆文.岩石土壤样品中210Po的测定[J].铀矿分析工艺,1981(1):1-8.
[5]张庆文,吕应松.铀矿样品中210 Po的测定[J].铀矿分析工艺,1981(1):93-94.
[6]廖运璇,张露.环境介质中210 Po的分析测定[J].铀矿冶,2013,32(4):221-223.
[7]王玉学.岩石、土壤样品中210 Po测定方法的研究[J].铀矿地质,2005,21(4):248-256.
[8]王玉学,郭冬发,王哲,等.210 Po、210 Bi和210 Pb测试技术研究进展与现状[J].铀矿地质,2014,30(4):242-249.
[9]朱元保,沈子琛,张传福,等.电化学数据手册[M].长沙:湖南科学技术出版社,1985:198-217.