摘要
利用X射线荧光光谱法检测海水中溴元素含量,研究雷州半岛东部近岸水体中溴元素空间分布特征,分析影响雷州半岛东部沿岸水体溴元素空间分布的原因。首先,利用小焦点X射线荧光光谱仪和直接进样法测量标准溶液并建立标准溶液校准曲线,根据特征X射线的荧光强度与标准溶液中溴元素质量浓度的线性关系建立线性拟合方程,反演待测海水中溴元素的质量浓度;然后依据各采样点水体中溴元素质量浓度的空间变化、地表径流的空间分布、潮汐信息及雷州半岛东部沿岸的环流空间结构,分析地表径流、潮汐及环流等因素对雷州半岛东部近岸水体溴元素质量浓度空间变化的影响。对雷州半岛东部18个站位点取样海水的X射线荧光光谱反演计算,结果表明该区域溴元素质量浓度范围在50.79~62.11 mg/L,均低于大洋水体中的平均溴元素质量浓度。研究区内溴元素质量浓度空间变化较大,大致呈离两湾一岛(湛江湾、雷州湾及硇洲岛)近海水中溴元素质量浓度低,离两湾一岛远溴元素质量浓度高的空间分布特征。此外,在研究区南部及琼州海峡入口处,由于复杂的环流结构影响,溴元素质量浓度呈现出明显的沿琼州海峡流流向递增的趋势。雷州半岛东部近岸水体中各个采样点溴元素质量浓度随空间变化的现象表明雷州半岛东部近岸海水中的溴元素质量浓度分布是不均衡的。地表径流、潮汐、沿岸流、海峡流及气旋式环流是导致雷州半岛东部近岸水体溴元素质量浓度空间分布不均衡的主要因素。
The content of Bromine was measured by X-ray fluorescence approach in order to study the spatial distribution characteristics of Bromine in seawater and analyze the reasons that affect the distribution of Bromine near the Eastern shore of Leizhou Peninsula.First,the calibration curve of standard solution is obtained by small-focus X-ray fluorescence spectrometer and direct injection method,and the linear fitting equation is derived from the relationship between the fluorescence intensity and the mass concentration of Bromine,to detect the mass concentration of Bromine in coastal waters.Then,we further analyze the influences of the land runoff,tide and the structure of circulation on the distribution of Bromine in seawater in the east of Leizhou Peninsula based on the spatial variation of Bromine mass concentration in water,the spatial distribution of land runoff,tide and the structure of circulation.The Bromine mass concentration of 18 stations in the east of Leizhou Peninsula is in the range of 50.79‒62.11 mg/L derived by the X-ray fluorescence spectrometry approach,and the results indicate that the content of Bromine in this area is less than that in the ocean and varies greatly with space.In this area,the Bromine content almost increases with the distance between the sampling site and two-bays-one-island(Zhanjiang bay,Leizhou bay and Naozhou island)increasing.In addition,in the south of this area and the entrance of Qiongzhou Strait,for the complex influences of currents,the Bromine content increases along the flow direction of Qiongzhou Strait.The variation of Bromine mass concentration in coastal waters demonstrates that the distribution of Bromine is uneven,and the uneven distribution fact of Bromine is mainly caused by the land runoff,tide,alongshore current near Western Guangdong,Qiongzhou Strait current,and cyclonic circulation.
作者
刘维一
熊正烨
郭竞渊
廖小婷
余果
Liu Weiyi;Xiong Zhengye;Guo Jingyuan;Liao Xiaoting;Yu Guo(College of Electronic and Information Engineering,Guangdong Ocean University,Zhanjiang 524088,Guangdong,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2024年第5期79-87,共9页
Laser & Optoelectronics Progress
基金
广东省科技计划项目(2015A020216020)
广东海洋大学项目(S202010566059)
湛江市科技计划项目(2022A05022)。
关键词
X射线光学
X射线荧光光谱法
粤西沿岸流
琼州海峡流
气旋式环流
X-ray optics
X-ray fluorescence spectrometry
alongshore current near Western Guangdong
Qiongzhou Strait current
cyclonic circulation
