环境样品中^(40)K的测定

DETERMINATION OF ^(40)K IN THE ENVIRONMENTAL SAMPLES

研究了用HNO3 浸取环境样品灰样及水渣样中的K和用简易酸碱法浸取土壤中K的方法。用KB(C6H5) 4 容量法和重量法测定K含量 ,考察了一些无机离子及酸根对测定的影响。容量法的相对标准偏差为 2 % ,重加回收率为 98%～ 10 2 %。用γ能谱法对照分析 ,结果吻合良好。测定了土壤标准物质 (IAEA 32 6 )中的40 K ,结果与推荐值吻合。对环境样品中的40 K与总 β放射性活度进行了比较 ,未污染的环境样品中40 K占总 β放射性活度 80

Leaching out K from ash of the environmental samples and slag of water samples using HNO 3, as well as from soil using simple acid base are studied. Contents of K in the samples have been determinated with volumetric and gravimetric methods. Effects of some impurity ions are examineted. Relative deviation of volumetric method is 2% and the recovery is 98%～102%. Correlation analysis is completed by γ Spectrum analysis, the determinated result of 40 K in IAEA 326 standard substance fits well with the recommended value. Radioactivity of 40 K is compared with total β in the environmental samples, radioactivity of 40 K is 80% of total β in uncontaminated environmental samples.