The Estimation of Submarine Inputs of Groundwater to a Coastal Bay Using Radium Isotopes

详细信息   

• 责任者：Guo Zhanrong (College of Oceanography and Environmental Science ; Xiamen University ; Xiamen 361005 ; China) ; Huang Lei
• 刊名：Acta Geoscientica Sinica
• 出版年：2008
• 卷期：29(5)
• 关键词：地下水排泄 ; discharge ; 镭同位素 ; radium isotope ; 海洋环境 ; marine environment ; 福建 ; Fujian
• 页码：p.647-652
• 图表：3 illus., 1 table, 27 refs.
• 分类号：0200
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

摘要

///This paper reports the results of initial research on radium isotopes of surface ocean waters in the Longjiao Bay on the western flank of Taiwan Strait. The main objective of this research is to assess the submarine groundwater discharge (SGD). In order to assess the spatial distribution of ²²⁴Ra and ²²⁶Ra, the authors collected 15 surface ocean water samples during the low tide. The collection was performed within a period of 2 hours in the direction from onshore to 9 km offshore by using 60 L polypropylene buckets. In the laboratory, the water samples were immediately treated through gravity-fed PVC column (4.5 cm in diameter, 50 cm in length), filled with manganese oxide-impregnated acrylic fiber at a flow rate of 300 ml/min to retain radium. After that, the activities of ²²⁴Ra absorbed on the Mn-fiber were measured through the continuous emanation method. Finally, the Mn-fiber was sealed for more than 7 days, and the activities of ²²⁶Ra absorbed on the Mn-fiberwere measured through the direct emanation method. 226Ra distribution yields an activity gradient of -0.963 dpm 100l^-1?? km^-1.