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本文研究了充N_2KCN水溶液体系的γ辐解,测得主要辐解产物产额为:G_((甘氨酸))=0.37,G_((Rf=0.14产物))=0.15,G_((Rf=0.21产物))=0.62,G_((Rf=0.25产物))=0.34,G_((尿素))=0.11,G_((CNO~-))=0.39,G_((HCONh2))=1.0,G_((甲醛))=0.08,G_((CO3~(2-)))=0.09.尿素由下列反应生成: HCNO+NH_3—→CO(NH_2)_2因此G_((CNO~-))=0.50,测定了甲酸钠对主要辐解产物产额的影响,并与缺氧条件下的结果进行了比较。实验和动力学处理结果表明,CNO~-和HCONH_2的生成除与OH自由基有关外,还分别与H(以H_2CN形式)和水化电子(以HCN~-形式)有关。求得由·CONH_2自由基岐化反应生成的G_((CNO~-))和G_((HCONH_2))值分别为0.36,H_2CN与·CONH_2自由基反应生成的G(CNO~-)为0.14,HCN~-与·CONH_?自由基反应生成的G_((HOONHO))为0.64。以_(HCO2~-)为自由基清除剂求得k_(OH+HCO_2~-)为3.0±2×10~9M~(-1)S~(-1),以C_2H_5OH为自由基清除剂求得k_(OH+C_2H_5OH)=1.7×10~9M~(-1)S~(-1)。 实验表明甘氨酸的生成与水化电子有关,甲醛可能为刺点反应产物,R_f=0.21未知物似乎与水化电子和HCN形成的产物有关。在较高pH值时,使用自由基清扫法,判明了由水化电子和HCN形成的HCN~-在化学行为上与由H原子形成的H_2CN不同。从物料平衡估算得体系每吸收1
In this paper, the γ-radiation of N 2 KCN aqueous solution was studied. The yield of the main radiolysis products was calculated to be G_ (glycine) = 0.37, G_ (Rf = 0.14) = 0.15, G_ ) = 0.62 G_ (Rf = 0.25 product) = 0.34 G_ (urea) = 0.11 G_ (CNO ~ -) = 0.39 G_ (HCONh2) = 1.0 G_ (Formaldehyde )) = 0.08 and G (CO3 ~ (2 -))) = 0.09. The urea is formed by the following reaction: HCNO + NH 3 → CO (NH 2) On the yield of major radiolysis products and compared with the results under hypoxic conditions. Experimental and kinetic results show that the formation of CNO ~ - and HCONH_2 are related to H (as H_2CN) and hydrated electrons (as HCN ~ -) in addition to OH radicals. The values of G (CNO ~ -) and G (HCONH_2)) generated by · CONH_2 radical dissociation were 0.36 and 0.14, respectively, for the reaction of H 2 CN and · CONH 2 radicals. The G (HOONHO) generated by the reaction of HCN ~ - with CONH_ radical was 0.64. The free radical scavenger (HCO2 ~) was used to determine the concentration of k (OH + HCO_2 ~) = 3.0 ± 2 × 10 ~ 9 M ~ (-1) S -1 and C_2H_5OH as free radical scavenger So k_ (OH + C_2H_5OH) = 1.7 × 10 ~ 9M -1 S -1. Experiments show that the formation of glycine and hydration of electrons, formaldehyde may be a punctate reaction product, R_f = 0.21 unknowns seem to hydrate electrons and the formation of HCN-related products. At higher pH, using free-radical scavenging method, it was found that HCN ~ - formed by hydration electrons and HCN is chemically different from H_2CN formed by H atom. Estimated from the material balance each absorption system 1