摘要
应用改进的磷钼酸铵(AMP)富集法吸附、富集海水中的137Cs,并采用γ谱仪进行测量。结果表明,改进磷钼酸铵法最佳的实验条件为:量取20～100 L海水样品,调节pH 1.2～3.3,按每5 L水样50 mg、1 g的比例分别先后加入铯载体和40～60目的磷钼酸铵(AMP),通入30 L/min的气泡搅拌30 min,放置澄清4 h以上(一般放置时间不超过24 h)。用改进磷钼酸铵法取40 L海水样品进行实验时,铯的化学回收率93%～100%,放射性137Cs回收率94%～102%。γ能谱法测定海水中137Cs分析结果和β计数法进行比较,两者在t检验上没有显著性差异,证明γ能谱法测定大体积海水中137Cs的方法是可行的。
Now, analysis of 137 Cs in seawater is tedious and prolonged because of the inappropriate materials and complicated processing methods used. To answer the call for measurement and analysis of 137 Cs in seawater, this paper proposes a conven-ient procedure for the determination of radiocaesium by gamma （γ）-spectrometry. An improved ammonium phosphomolybdate （AMP） procedure is proposed ： adjust the pH to 1.2 - 3.3, next add 50 mg CsC1 per 5 L seawater to form an insoluble compound, then add 1 g AMP（40 -60 mesh）/5 L seawater to every 20 - 100 L seawater sample. Stir at a rate of 30 L air/min for 30 min, then recover the AMP/Cs compound after 6 -24 h. The weight yield of AMP/Cs compound was about 93% - 100% of AMP for 40 L samples and the radio- chemical 137Cs yield was 94% - 102%. 137Cs activities in 20 - 100 L samples from sea surface in the Hangzhou Bay were measured by the im-proved procedure. There is no significant difference between gamma （γ）-spectrometry and beta counting with paired design student test.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2012年第4期599-602,共4页
Marine Environmental Science
关键词
137Cs
Γ能谱法
磷钼酸铵
海水
137 Cs
Gamma （γ）-spectrometry
ammonium phosphmolybdate （AMP）
seawater
