中子活化分析环境样品干扰元素的分离

环境样品使用中子活化法分析,在γ多道测量过程中,常有干扰发生。若将铜载体加入松叶分解液中,可与CH_3CSNH_2反应形成硫化物沉淀,在共沉淀过程中可去除干扰元素。在不同的pH条件下,松叶中各种被测元素的回收率不同。使用放射性核素示踪方法测量,当pH增大时,Ag、Cd和Cu的回收率随之增大,而Sb和As的回收率将减小,Hg的回收率变化不大。

Removal of Interfering Elements in Neutron Activation Analysis of Environmental Samples

Gamma-ray measurement is usually interfered during the analysis of environmental samples with neutron activation analysis (NAA) method. The interfering elements could be removed through a Co-precipitation process which took place addition of Cu carrier, radioactive tracers and CH3CSNH2 to the decomposed pine leaves. The removal rates (R), which were tested by radiotracer technique, are affected by pH values. Recoveries of Ag, Cd and Cu increase when pH value rises and on the contrary, recovery of Sb decrease. However, recovery of Hg is not the function of pH values.