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环境化学  2015 

大亚湾和四十里湾附近海域表层沉积物中无机碳形态研究

Keywords: 海洋沉积物,无机碳,连续浸取,地球化学形态

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Abstract:

采用连续浸取法对位于亚热带的大亚湾和温带的四十里湾附近海域的表层沉积物样品中无机碳的赋存形态进行了研究,将无机碳分为可交换态(NaCl相)、弱碱浸取态(NH3·H2O相)、强碱浸取态(NaOH相)、弱酸浸取态(NH2OH·HCl相)和残渣态,测定了相关地球化学参数粒度组成和总有机碳(TOC).结果表明,NH2OH·HCl相无机碳是大亚湾和四十里湾附近海域表层沉积物中无机碳的主要存在形式,其平均含量分别占总无机碳的46.2%和86.8%.沉积物粒度是控制四十里湾附近海域表层沉积物中NaCl相、NH3·H2O相和NaOH相无机碳含量空间变化的重要因素;较高含量的粘土组分有利于大亚湾表层沉积物中NH3·H2O相和NaOH相无机碳的保存.TOC仅与大亚湾表层沉积物中的NaOH相无机碳和四十里湾附近海域表层沉积物中NaCl相无机碳具有显著的正相关关系,表明其总体上对这两个海域表层沉积物中无机碳的形态组成影响较弱.

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