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东海泥质区表层沉积物中锰、铁和铝的赋存形态及影响因素研究
引用本文:李文君,卢彦宏,高峰,魏璟弢,李铁,朱茂旭.东海泥质区表层沉积物中锰、铁和铝的赋存形态及影响因素研究[J].中国海洋大学学报(自然科学版),2012(Z1):165-171.
作者姓名:李文君  卢彦宏  高峰  魏璟弢  李铁  朱茂旭
作者单位:中国海洋大学海洋化学理论与工程技术教育部重点实验室
基金项目:国家重点基础研究发展计划项目(2005CB422305);国家自然科学基金项目(41076045)资助
摘    要:2007年11月在东海泥质区采集了表层沉积物样品,用连续提取法对金属元素的赋存形态进行了分离,测定了各形态中锰、铁和铝的含量。结果表明,锰主要赋存于碳酸盐结合态,含量为0.04~0.19mg/g,平均0.13mg/g;铁主要赋存于易还原态(铁锰氧化物结合态),含量为1.1~2.3μg/g,平均1.5mg/g;大部分站点的铝主要赋存于易还原态,含量为0.4~1.1mg/g,平均0.7mg/g。沉积物主要成分对金属赋存形态产生影响,CARB态、ERO态Mn、Fe和Al分别随沉积物中碳酸钙、水合铁锰氧化物含量的升高而增加,且ERO态金属与水合铁锰氧化物的相关性显著;有机物的含量的对OSM态金属的影响则不明显。非残渣态Fe和Al的含量随水深增加而降低,主要是由于沉积物中ERO态Fe和Al受陆地径流输入和水体中清除作用的影响,导致近岸沉积物中有较多的活性Fe、Al;离岸距离增加则沉积物中活性Fe、Al含量减少。

关 键 词:东海  泥质区  金属元素  化学形态

Study of the Geochemical Forms of Manganese,Iron and aluminum in Surface Sediments of Mud Area from the East China Sea Continental Shelf and Their Influence Factors
LI Wen-Jun,LU Yang-Hong,GAO Feng,WEI Jing-Tao,Li Tie,ZHU Mao-Xu.Study of the Geochemical Forms of Manganese,Iron and aluminum in Surface Sediments of Mud Area from the East China Sea Continental Shelf and Their Influence Factors[J].Periodical of Ocean University of China,2012(Z1):165-171.
Authors:LI Wen-Jun  LU Yang-Hong  GAO Feng  WEI Jing-Tao  Li Tie  ZHU Mao-Xu
Institution:(The Key Lab of Marine Chemistry Theoretics and Engineering Technology Ministry of Education,Ocean University of China,Qingdao 266100,China)
Abstract:Surface sediment samples at thirteen sites from the mud areas of the East China Sea were collected in November 2007.Geochemical forms of non-residual,i.e.,exchangeable(EXC),carbonate combined(CARB),easily reducible(ERO;iron and manganese oxyhydroxide combined),organic matter combined(OSM) of manganese,iron and aluminum were extracted and determined with a sequential chemical leaching method.The major form of manganese in the surface sediment of the mud area was CARB-Mn,which was ranged from 0.04 to 0.19 mg/g with an average value of 0.13 mg/g.The major form of iron was ERO-Fe,which was ranged from 1.1 to 2.3 mg/g with an average value of 1.5 mg/g.The major form of aluminum in most sites was ERO-Al,which was ranged from 0.4 to 1.1 mg/g with an average value of 0.7 mg/g.The geochemical forms of manganese,iron and aluminum were influenced by the major components of sediment.CARB-Mn,CARB-Fe and CARB-Al increased with the increasing content of calcium carbonate,as well as ERO-Mn,ERO-Fe and ERO-Al increased with the increasing content of iron and manganese oxyhydroxide with good correlation.Nevertheless,OSM-Mn,OSM-Fe and OSM-Al were not influenced significantly by organic matter content of sediment.The total amounts of non-residual iron and aluminum with water depths of the sediments,which were caused by the decreasing contents of ERO-Fe and ERO-Al from the coast to the distant sea.It indicated that the input of dissolved iron and aluminum from the land and scavenging of authigenic manganese,iron and aluminum oxyhydroxide from seawater induced the decreasing reactive iron and aluminum in sediment from the shallow coast to relatively deep water.
Keywords:East China Sea  mud area  metal  geochemical form
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