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  

FRACTIONATION OF INORGANIC CARBON IN SURFACE SEDIMENTS OF DAYA BAY AND SISHILI BAY AREAS

作　　者：解学良[1] 王允周[2] 张培玉[1] 高学鲁[2] 

机构地区：[1]青岛大学化学化工与环境学院,青岛266071 [2]中国科学院烟台海岸带研究所海岸带环境过程重点实验室,烟台264003

出　　处：《环境化学》2011年第6期1108-1113,共6页Environmental Chemistry

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-Q07-03;KZCX2-YW-JC203;KZCX1-YW-06-02)资助

摘　　要：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(NH.3H2O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、NH.3H2O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NH.3H2O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.A sequential extraction technique was used to study the geochemical fractions of inorganic carbon（IC） in surface sediments of Daya Bay and Sishili Bay area.The IC was divided into five fractions： the exchangeable fraction（NaCl fraction）,weak alkali extractable fraction（NH3·H2O fraction）,strong alkali extractable fraction（NaOH fraction）,weak acid extractable fraction（NH2OH·HCl fraction） and residual fraction.The sediment grain size composition and total organic carbon（TOC） were also measured to seek their relationships with the IC contents and fractionation.The results showed that NH2OH·HCl fraction is the major component of inorganic carbon in surface sediments of Daya Bay and Sishili Bay area,and it on average accounts for 46.2% and 86.8% of the total inorganic carbon.For the samples from the Sishili Bay area,the sediment grain size is an important factor that influences the spatial variation of inorganic carbon in NaCl,NH3·H2O and NaOH fractions.For the samples from Daya Bay,the higher clay content benefits the preservation of inorganic carbon in NH3·H2O and NaOH fractions.The TOC contents showed significant positive correlations only with NaOH fraction of inorganic carbon in surface sediments of Daya Bay,and with NaCl fraction in surface sediments of the Sishili Bay area,it indicated that as a whole TOC has a weak influence on the fractionation of inorganic carbon in surface sediments of the two research areas.

关 键 词：海洋沉积物 无机碳 连续浸取 地球化学形态 

分 类 号：X132[环境科学与工程—环境科学]