相对于放射性核素总量，核素赋存形态的研究对于了解核素的来源、迁移转化规律和生物有效性等具有重要意义。本项目以大亚湾附近海域为主要研究区域，通过海域表层沉积物和海水样品的采集分析，选择BCR 重金属形态分析法，研究核电站废水中主要放射性核素 60Co、137Cs 和90Sr在大亚湾海域表层沉积物中的富集状况及赋存形态；运用单因素实验法研究沉积物富集60Co、137Cs 和 90Sr的性能及规律；运用动力学和热力学模型模拟研究表层沉积物富集放射性核素 60Co、137Cs 和 90Sr的规律和机制；运用EQ3/6、VISUAL MODELFLOW和PHREEQC等模型模拟研究60Co 、90Sr、137Cs在沉积物及海洋中的存在形式，迁移条件、平衡计算，建立60Co 、90Sr、137Cs在海洋-沉积物体系之间的迁移模式,有望对上述基础研究作出积极探索。

Relative to the amount of radionuclides，the speciation of radionuclides is more important to understand the nuclides source, migration,transformation and biological effectiveness. This project use the BCR morphological analysis of heavy metals to study the enrichment situation and speciation of 60Co, 137Cs and 90Sr by surface sediments in daya bay surface sediment through the sea surface sediment and water sample collection and analysis. Using single factor experiment method to study the accumulation performance and law of 60Co, 137Cs and 90Sr by sediment.Using kinetic and thermodynamic model to study the enrichment regularity and mechanism of 60Co, 137Cs and 90Sr; The models of EQ3/6、VISUAL MODELFLOW and PHREEQC will be used to study the speciation、transition conditions、balance computation and establish the migration model of 60Co，137 Cs and 90Sr in the marine sediments system, we expecte to make active exploration on the basic research, the results can provide scientific basis environmental quality assessment, quality monitoring and control the marine radioactive pollution