研究论文
史建君,郭江峰.茶树-土壤生态系统中HTO的迁移与消长动态[J].环境科学学报,2002,22(2):166-170
茶树-土壤生态系统中HTO的迁移与消长动态
- The transportation and accumulation-disappearance of HTO in the tea-soil ecosystem
- 基金项目：国家自然科学基金(39870150);浙江省自然科学基金(398032)资助项目
- 作者
- 单位
- 史建君
- 浙江大学原子核农业科学研究所(华家池校区),农业部核农学重点开放试验室,杭州 310029
- 郭江峰
- 浙江大学原子核农业科学研究所(华家池校区),农业部核农学重点开放试验室,杭州 310029
- 摘要：采用模拟污染物的同位素示踪技术研究HTO(氚水)在茶树土壤模拟生态系统中的迁移规律.测定了植物和土壤样品中两种形态氚(自由水氚和结合态氚)的比活度,并应用具有相互交换的双库室开系统模型确定了茶树和土壤分室的拟合方程.结果表明:引入土壤中的HTO,不仅在系统各分室间转移和分配,而且迅速向系统外扩散;HTO中的氚以自由水氚和结合态氚形式存在于茶树中,以吸湿性水氚和结晶水氚存在于土壤,其中自由水氚(或吸湿性水氚)远大于结合态氚(或结晶水氚);对实验数据进行回归分析得:茶树植株中的总氚比活度Ct(t)=314.09(e-0.0569t-e-0.3777t),土壤中的总氚比活度Cs(t)=136.73e-0.3777t+112.22e-0.0569.
- Abstract：The dynamics of transportation of HTO (tritium water) in a simulated tea soil ecosystem were studied on simulated pollutants using isotope tracer technique. The specific activities of two forms of tritium (free water tritium and bound tritium) in plant and soil sample were measured, and the fitting equation was confirmed by the open tow compartment system model with interchange. The results showed that HTO not only transferred to other compartments in the ecosystem, but also vaporized into atmosphere rapidly.Free water tritium and bound tritium were found in the tea, and hygroscopic and crystalline water tritium in the soil. The specific activity of free water tritium (or tritium of hygroscopic water) was higher than that of bound tritium(or crystalline water tritium). The regression equation of transportation for the specific activity of total tritium in the tea and soil are Ct(t)=314.09(e-0.0569 t-e-0.3777t) and Cs(t)=136.73e-0.3777 t +112.22e-0.0569 t.
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