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为了解放射性核素110Agm在大亚湾水域中的迁移和运输,采用批次法研究了4个大亚湾表层沉积物在天然海水中对110Agm的吸附和解吸行为.在吸附反应体系中,Ag+的质量浓度为1.3 ng/mL,110Agm的放射性浓度为10.0 Bq/mL,海水的pH为8.20,盐度为32.0,固液比为1.0 mg/mL时,在短时间(约40 s)内,110Agm的吸附率即达到28.6%.说明大亚湾表层沉积物对110Agm存在一个快速吸附过程;在吸附时间1 h以内吸附率变化很小,4个沉积物的平均吸附率为30.0%;从1 h~5 d,吸附率可上升至64.4%;5 d以后吸附趋于平衡,吸附分配比平均为1.86×103 mL/g,与解吸实验达到平衡时的吸附分配比1.90×103 mL/g相同.在固液比为4~250 mg/L时,110Agm的吸附分配比随固液比的增加而减小,在250~1 000 mg/L内,随固液比的增加而增加,当固液比大于1 000 mg/L时,分配比基本上保持一个恒定值. 相似文献
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Tritium behavior in the reactor such as production, diffusion and release are accompanied by their adsorption and desorption in graphite materials, which are essential to the safety of high temperature gas cooled reactor (HTGR). In order to study this important issue, hydrogen instead of tritium is experimentally used in this work and justified viable by theory. By performing multiple sets of comparative experiments, the features of hydrogen adsorption and desorption behavior changing by adsorption temperature and time in typical graphites used in HTR-PM (High Temperature Gas Cooled Reactor – Pebble Bed Module), i.e. reflective layer, fuel element and boron carbon bricks, have been observed and analyzed. Furthermore, the adsorption rates of hydrogen in the three materials as above at different conditions are also given. Based on the experimental results, tritium behavior in the HTR-PM was inferred and estimated, which is significant for the further study on the mechanism of tritium transport. 相似文献
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珠江口、大鹏湾和大亚湾海域海水及沉积物中放射性核素水平 总被引:1,自引:0,他引:1
本文报道了珠江口、大鹏湾和大亚湾海域海水及沉积物中放射性核素水平。经2013年9月秋季航次和2014年4月冬季航次取样监测,珠江口、大鹏湾和大亚湾海域海水中226Ra、232Th、40K和137Cs的放射性活度浓度分别为12.8~42.6 Bq/m3(平均21.7±7.3 Bq/m3)、3.2~26.6 Bq/m3 (平均11.8±6.5 Bq/m3)、529.7~974.1 Bq/m3(平均820.6±120.0 Bq/m3)和0.5~3.8 Bq/m3 (平均2.3±1.0 Bq/m3);沉积物中226Ra、232Th、40K和137Cs的放射性活度浓度分别为16.9~35.0 Bq/kg (平均27.9±7.2 Bq/kg)、22.0~59.8 Bq/kg (平均36.5±11.1 Bq/kg)、326.2~621.0 Bq/kg(平均456.2±100.1 Bq/kg)和0.3~3.5 Bq/kg(平均1.5±0.7 Bq/kg);海水及沉积物中110mAg的含量均低于检测限。珠江口、大鹏湾和大亚湾海域海水及沉积物中放射性核素水平与我国其它海域相当。 相似文献
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1IntroductionThedistrictoftheJiaozhouBayintheeasternChinaisanexampleofhighlyanthropogenicresultedcomplexecosystemwhichmerges... 相似文献
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