| 硫氰根的γ射线辐照降解研究 |
| 摘要点击 1528 全文点击 1343 投稿时间：2007-06-12 修订日期：2007-09-10 |
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| 中文关键词 γ射线 SCN- 辐照 降解 |
| 英文关键词 γ-rays SCN- radiolysis decomposition |
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| 中文摘要 |
| 研究了60Co源γ射线辐照降解SCN-.在溶液pH=1、 pH=3时， 25 mg/L的SCN-在6 kGy下基本能够得到降解，降解率分别达到98.11%、95.97％，pH=7时，在9 kGy下，SCN-的降解率为99.33％；但在碱性条件下，18 kGy的剂量下，才能得到降解，达99.64％(pH=10)和99.93％(pH=12).在高浓度下，SCN-溶液的降解则需要更大的剂量.通过对辐照后的SCN-溶液TOC和TN的测定可知：辐照法对SCN-溶液除去TOC和TN效果不明显，不同剂量辐照后溶液中SO２－4和NO-3浓度的变化表明，SCN-在γ射线辐照过程中可能的反应历程为：硫元素首先被除去，转变成SO２－4，而氮元素则很少转变成NO-3，主要是以其它形式的氮存在. |
| 英文摘要 |
| Radiolysis of aqueous solution of thiocyanate by ６０Co γ-rays was studied. In condition of pH=1 and pH=3，25 mg/L SCN- was decomposed under the dose of 6 kGy, with decomposition rate of 98.11% (pH=1) and 95.97％ (pH=3) respectively. 25 mg/L SCN-(pH=7) was decomposed under the dose of 9 kGy and the decomposition rate is 99.33%. In the alkaline condition, pH=10 and pH=12, the dose of 18 kGy was need, and the decomposition rate is 99.64％and 99.93％ respectively. High SCN- concentration means that more radiation dose is need. From the comparison of before radiolysis and after radiolysis's TOC(total organic carbon) and TN (total nitrogen) of SCN-solution, little TOC and TN was removed. The determination of SO２－4and NO-3 concentration indicated that sulfur element was removed and converted to SO２－4, and nitrogen element rarely converted to NO-3, but converted to other forms of nitrogen. |
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