摘要
钴(Co)对海洋中的生物地球化学循环过程起着不可或缺的作用.河口是陆源物质进入海洋的重要界面,而Co在长江口界面的生物地球化学行为尚不明确.本文使用自动固相萃取-电感耦合等离子体联用技术对长江口及其附近海域2019年9月(秋季)、2021年3月(春季)和2021年7月(夏季)的表层水中的溶解Co进行了分析.结果显示,秋季Co浓度的范围在0.05—0.24 nmol·L^(−1),均值为0.10 nmol·L^(−1);春季为0.05—0.37 nmol·L^(−1),均值为0.13 nmol·L^(−1),略高于秋季;夏季为0.03—0.54 nmol·L^(−1),均值高达0.26 nmol·L^(−1),浓度最高.Co与盐度、营养盐、叶绿素及溶解氧在不同季节表现出不同的相关性,表明长江口Co的行为受多因素的影响.长江口溶解Co浓度自河口向外海逐渐降低,整体表现为移除型分布类型.长江口Co移除率秋季>夏季>春季,向海有效输送通量夏季>春季>秋季.
Cobalt(Co)plays a crucial role in biogeochemical cycling processes in the ocean.Estuaries are the important interface for terrigenous materials to enter the ocean,and the biogeochemical behavior of Co at the interface of the Changjiang(Yangtze)estuary remains unclear.In this study,dissolved Co in the surface waters of the Changjiang River Estuary and its adjacent waters in September 2019(autumn),March 2021(spring)and July 2021(summer)was analyzed by automatic solid phase extraction and inductively coupled plasma technology.The results show that the concentration of Co ranges from 0.05 to 0.24 nmol·L^(−1)with an average of 0.10 nmol·L^(−1)in autumn;0.05 to 0.37 nmol·L^(−1)with an average of 0.13 nmol·L^(−1)in spring,slightly higher than that in autumn;0.03 to 0.54 nmol·L^(−1)with an average of 0.26 nmol·L^(−1)in summer,which was the highest concentration.Co shows different correlations with salinity,nutrients,chlorophyll and dissolved oxygen in different seasons,indicating that the behavior of Co in the Changjiang Estuary is affected by multiple factors.The dissolved Co concentration in the Changjiang River Estuary gradually decreases from the estuary to the sea,showing a general removal-type distribution.The removal rate of Co in the Changjiang Estuary behaves as autumn>summer>spring,and the effective transport flux to the sea follows the order of summer>spring>autumn.
作者
高萌
姜子元
葛云骢
张瑞峰
GAO Meng;JIANG Ziyuan;GE Yuncong;ZHANG Ruifeng(School of Oceanography,Shanghai Jiao Tong University,Shanghai,200030,China;Key Laboratory of Polar Science,Ministry of Natural Resources,Polar Research Institute of China,Shanghai,200136,China)
出处
《环境化学》
CAS
CSCD
北大核心
2023年第3期707-719,共13页
Environmental Chemistry
基金
国家自然科学基金委员会国际合作研究项目(41861134040)
国家自然科学基金委员会共享航次计划项目(42049903)
同济大学海洋地质国家重点实验室开放基金课题(MGK202005)资助.
关键词
长江口
CO
季节分布
河口行为
Changjiang Estuary
Co
seasonal distribution
estuarine behavior
