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	闽江下游及河口区表层沉积物多种微量元素特征; Characteristics of trace elements in sediments of lower reach and estuary of Minjiang River
	倪冠韬 ; 高爱国 ; 朱旭旭 ; 黄书昕
	2015-08-15
关键词	海洋化学 河口 表层沉积物 微量元素 闽江 marine chemistry estuary surface sediments trace elements Minjiang River
英文摘要	为探讨闽江下游及河口区表层沉积物中元素组成、分布规律,用X射线荧光法分析了研究区域表层沉积物中11种微量元素的含量,并简要讨论了其分布特征和影响因素.分析结果表明,研究区沉积物中元素bA含量最高,平均为515 Mg/kg,元素gA最低,平均为7.54 Mg/kg,11种元素按含量由高到低排列是bA、rb、zr、Sr、Cr、V、zn、nb、y、Cu、gA;元素变异系数介于0.17~1.05之间,最大为zr,最小为bA.被测元素含量均呈现出沿河道向河口递增的趋势,部分元素表现出南、北港下游含量高于上游的分布特征,显示人类活动的影响.元素含量高值与SI/Al比值所反映出的沉积物细颗粒区域相对应.沉积物微量元素含量与花岗岩成分相近,与石英砂岩存在较大差别.研究区域沉积物与长江、黄河和珠江沉积物相比,bA、rb两种元素含量差异相对较小,4条河流bA约500Mg/kg、rb约100 Mg/kg,其余元素在闽江沉积物中的含量相对较低,元素zn、Cu差异最大.Cu、zn和Cr 3种重金属元素相对以往分析结果较低.被测元素中V、y、zr、nb 4种元素彼此相关性较强,相关系数均在0.8以上.被测元素均与SI/Al比值呈负相关关系,其中rb、bA、Sr关系相对密切,相关系数分别为:-0.887 2,-0.886 5和-0.885 8.通过沉积物微量元素分布及其影响因素探讨的分析表明,元素分布反应出在该区域物源和气候等特征条件影响下物理、化学风化的结果,同时受到沉积物粒度、人为活动和潮汐等因素的共同作用.; In ord er to study the element components and distributions of the surface sediments in the lower reach and estuary of Minjiang River,we measured the concentrations of trace elements( V,Cr,Cu,Zn,Ga,Rb,Sr,Y,Zr,Nb,Ba) in the surface sediments of the areas studied with X-ray fluorescence( XRF) and discussed the distribution characteristics of the elements.Analysis results show the maximum concentration among the studied elements is Ba,with an average 515 mg / kg,while the minimum is Ga,with an average 7.54 mg / kg.The coefficients of variation( CV) of elements are calculated between 0.17 ~ 1.05,of which Zr is the lowest and Ba is the highest.The concentration of all elements shows increase from the lower reach to the estuary,and some elements have higher concentrations in the lower reach than the up reaches in North and South branches,reflecting the anthropogenic activities.Higher concentrations and the ratio of Si / Al of the stations are accorded with the areas where sediments grain is fine.The concentration of elements in sediments is similar to that of granite,and differs with quartz sandstone.The results are compared with that of Changjiang River,Yellow River and the Pearl River.It shows little differences between Ba and Rb,with Ba around 500 mg / kg and Rb around 100 mg / kg,in these 4 rivers.The concentrations of other elements are lower,and Cu and Zn are quite difference between Minjiang river and the others.The concentrations of Cu,Zn and Cr are lower than the historical data.V,Y,Zr and Nb have much stronger relations each other.All the correlation coefficients are higher than 0.8.All the elements studied have negative correlation with Si / Al,where Rb,Ba and Sr are much closer with Si / Al and the correlation coefficients are- 0.887 2,- 0.886 5 and- 0.885 8,respectively.The patterns of element distribution responding the characteristics of sediments in Minjiang river suggest that they are the physical and chemical weathering results under the combined influences of provenance and climates,as well as the particle sizes,anthropogenic factors and the tides.; 国家自然科学基金资助项目(41076122;41376050)
语种	zh_CN
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/104830]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	倪冠韬,高爱国,朱旭旭,等. 闽江下游及河口区表层沉积物多种微量元素特征, Characteristics of trace elements in sediments of lower reach and estuary of Minjiang River[J],2015.
APA	倪冠韬,高爱国,朱旭旭,&黄书昕.(2015).闽江下游及河口区表层沉积物多种微量元素特征..
MLA	倪冠韬,et al."闽江下游及河口区表层沉积物多种微量元素特征".(2015).

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