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采用模拟污染物的同位素示踪技术探索了~(89)Sr在水稻-田水-土壤系统中的消长与分配,并建立了其行为规律的数学模型。结果表明,田表水中~(89)Sr-Sr含量迅速地降低,1d后由原始量的8.5μg/g降为4.0μg/g,以后逐渐降低,至试验结束(28d)时为0.7μg/g;表土中~(89)Sr-Sr含量迅速地增大,1d后即由0达12.4μg/g,试验结束时为20.9μg/g;水稻地上部,1d后由0达8.8μg/g,以后也呈增加趋势,结束时达21.7μg/g,水稻根由1d的9.5μg/g达试验结束时的39.6μg/g,田表水、表土用水稻植株中~(89)Sr-Sr含量随时间变化的规律相应为. 其次,在收获期,糙米中~(89)Sr-Sr含量为1.6μg/g,稻壳为9.4μg/g,稻草为39.7μg/g,稻根为41.8μg/g。还测定了~(89)Sr-Sr在收获期土壤中的铅垂分布,表明,58.2％的~(89)Sr-Sr滞留于表层2cm,并且其滞留量随土壤深度按指数规律衰减:
The isotope tracing technique of simulated pollutants was used to explore the growth and distribution of ~ (89) Sr in rice-field water-soil system and to establish a mathematical model of its behavior. The results showed that the content of 89 Sr-Sr in the surface water decreased rapidly from 8.5 μg / g to 4.0 μg / g after 1 day, then decreased gradually to 0.7 μg / g. The content of Sr-Sr in the topsoil rapidly increased from 0 to 12.4 μg / g after 1 day and from 20.9 μg / g to the end of the experiment. After 1 day, the content of Sr-Sr increased from 0 to 8.8 μg / g , Followed by an increasing trend, reaching 21.7 μg / g at the end of the experiment. The rice root content was 39.6 μg / g at the end of 9.5 μg / g of rice at 1 day, and the content of 89 Sr-Sr in rice in surface water and topsoil The results showed that the content of ~ (89) Sr-Sr in brown rice was 1.6μg / g at harvesting stage, 9.4μg / g in rice husk, 39.7μg / g in rice straw and 41.8μg in rice root / g. The vertical distribution of ~ (89) Sr-Sr in the soils was also measured, indicating that 58.2% of 89 Sr-Sr resided in the surface 2 cm and its retention decay exponentially with depth of soil: