School of Nuclear Science and Technology, University of South China, Hengyang 421001, China.
School of Nuclear Science and Technology, University of South China, Hengyang 421001, China.
Mar Pollut Bull. 2021 May;166:112192. doi: 10.1016/j.marpolbul.2021.112192. Epub 2021 Mar 18.
Activity concentrations of radionuclides (U, Ra, Th, and K) in the sediments of eight sampling stations and heavy metal concentrations (Cr, Co, Ni, Cu, Zn, As, Cd, and Pb) in the sediments of two long cores from Nansha Sea area were obtained by high-purity germanium spectroscopy and inductively coupled plasma atomic emission spectrometry. In a correlation analysis between the radionuclides and heavy metals, Th was positively correlated with As and Pb. U demonstrated a significant positive correlation with Co, Ni, Cu, Zn, and Cd. K was positively correlated with Co, Ni, and Cu. The geo-accumulation index, pollution load index, potential ecological risk index, and multivariate statistical techniques were used to evaluate the pollution degree and possible sources of heavy metals in the sediments. An ecological risk assessment suggested that Cr, Co, Ni, Cu, Zn, Cd, and Pb were primarily derived from natural processes, while the source of As may be related to natural processes and human activities.
采用高纯锗光谱法和电感耦合等离子体原子发射光谱法分别测定了南沙海域 8 个站位沉积物中放射性核素（U、Ra、Th 和 K）的活度浓度和 2 个柱状沉积物中重金属（Cr、Co、Ni、Cu、Zn、As、Cd 和 Pb）的浓度。对放射性核素与重金属之间的相关性分析表明，Th 与 As 和 Pb 呈正相关，U 与 Co、Ni、Cu、Zn 和 Cd 呈显著正相关，K 与 Co、Ni 和 Cu 呈正相关。采用地积累指数法、污染负荷指数法、潜在生态风险指数法和多元统计技术对沉积物中重金属的污染程度和可能来源进行了评价。生态风险评价表明，Cr、Co、Ni、Cu、Zn、Cd 和 Pb 主要来源于自然过程，而 As 的来源可能与自然过程和人类活动有关。
