甲异羟肟酸-硝酸辐解产生的H2和CO

甲异羟肟酸(FHA)是有望用于乏燃料后处理的新型无盐络合剂.用5(A)分子筛填充柱与热导池检测器(TCD)联用的气相色谱法研究了HNO_3-0.2 mol/L FHA辐解产生的H_2和CO.H_2的分析是以Ar作载气,柱温为85 ℃,TCD温度为120 ℃; CO的分析是以H_2作载气,柱温为50 ℃, TCD温度为80 ℃.研究结果表明,H_2的体积分数随剂量的增加而增大,随HNO_3浓度的增大而减小;CO只有在剂量很高时才产生,且其体积分数远比H_2低,CO的体积分数随剂量的增加而增加.当c(HNO_3)≤0.5 mol/L时,CO体积分数低于0.2 mol/L FHA水溶液辐解产生的CO,但当c(HNO_3)≥1.0 mol/L时,CO的体积分数大于0.2 mol/L FHA水溶液辐解产生的CO, 且CO体积分数随c(HNO_3)的增大而增大.

H_2 and CO Produced by Radiolysis of HNO_3-FHA Solution

Formohydroxamic acid (FHA) is a new salt-free complexant which may be used in the reprocessing of spent nuclear fuel. This paper reports on the study of H_2 and CO produced by radiolysis of HNO_3-0.2 mol/L FHA. These analyses were performed by gas chromatography in which a packed 5(A) molsieves column and a thermal conductivity detector (TCD) were used. Argon was used as a carrier gas in the analysis of H_2, the temperature of column and TCD was 85 ℃ and 120 ℃ respectively; H_2 was used as a carrier gas in the analysis of CO, the temperature of column and TCD were 50 ℃ and 80 ℃ respectively. The results show that the volume fraction of H_2 increases with the dose, but decreases with the concentration of nitric acid. CO is only produced at high dose, and the volume fraction of CO is much lower than that of H_2. The volume fraction of CO increases with the dose. When the concentration of nitric acid is not more than 0.5 mol/L, the volume fraction of CO is lower than that produced by 0.2 mol/L FHA aqueous solution; when the concentration of nitric acid is no less than 1.0 mol/L, the volume fraction of CO is higher than that produced by 0.2 mol/L FHA aqueous solution, and the volume fraction of CO increases with the concentration of nitric acid.