三亚东部近岸海域表层沉积物重金属元素地球化学特征及环境质量评价

Geochemical characteristics and environmental assessment of heavymetal elements in surface sediments from the offshore area of eastern Sanya

本文对三亚东部近岸海域表层沉积物中7种重金属元素的地球化学特征和空间分布特征进行了研究,并应用地积累指数法和尼梅罗综合指数法对各重金属的污染程度进行了评价。研究发现,三亚东部近岸海域表层沉积物中重金属含量总体较低,符合《海洋沉积物质量》一类标准,大多数重金属元素含量的空间分布主要受元素的"粒度控制律"制约,其物质来源主要为陆源细粒沉积。地积累指数法和尼梅罗综合指数法的评价结果均表明,研究区表层沉积物的重金属未达到污染程度,属清洁状态,环境质量良好。

The geochemical characteristics and spatial distribution characteristics of 7 heavy metal elements in the surface sediments from the offshore area of eastern Sanya were studied,and the degree of pollution was assessed by using the index of geoaccumulation and the Nemerow comprehensive index methods.It is found that the content of heavy metals in the surface sediments from the offshore area of eastern Sanya are lower than the average value of elemental content in the neritic sediments of China,and the content of heavy metals conforms to the standard of Marine Sediment QualityⅠ,and the spatial distribution of the most heavy metal elements approximately follows the elemental particle-size control law.The provenances of heavy metals in this area are mainly from the terrigenous fine-grained sediments.The results of the index of geoaccumulation and the Nemerow comprehensive index methods all indicate that the heavy metals in the surface sediments of the study area are below pollution level and belong clean condition,the environment of surface sediments is fine.