【引用本文】 徐国栋, 葛建华, 杜谷, 等. 成都市中心城区地表沉积物中重金属分布及矿物学特征[J]. 岩矿测试, 2019, 38(4): 433-443. doi: 10.15898/j.cnki.11-2131/td.201811100120
XU Guo-dong , GE Jian-hua , DU Gu , et al. The Heavy Metal Distribution and Mineralogical Characteristics of Surface Sediments in Chengdu City[J]. Rock and Mineral Analysis, 2019, 38(4): 433-443. doi: 10.15898/j.cnki.11-2131/td.201811100120

成都市中心城区地表沉积物中重金属分布及矿物学特征

1. 中国地质调查局成都地质调查中心, 四川 成都 610081;

2. 成都市环境工程评审中心, 四川 成都 610000

收稿日期: 2018-11-10  修回日期: 2019-03-12 

基金项目: 成都市环境工程评审中心科技项目“成都市中心城区非渗透下垫面地表沉积物污染特征研究”(20160823)

作者简介: 徐国栋,高级工程师,主要从事岩石矿物分析工作。E-mail:xgd1230@163.com。。

通信作者:

The Heavy Metal Distribution and Mineralogical Characteristics of Surface Sediments in Chengdu City

1. Chengdu Center of Geological Survey, China Geological Survey, Chengdu 610081, China;

2. Chengdu Environment & Engineering Appraisal Center, Chengdu 610000, China

Corresponding author: DU Gu , 主要从事岩石矿物分析工作。dugucgs@163.com。

Received Date: 2018-11-10
Revised Date: 2019-03-12

摘要:城市地表沉积物已成为城市环境污染的重要组成部分,是城市环境中各种污染物的"源"和"汇",通过研究城市地表沉积物的物化及矿物学特征对城市环境质量的监测具有良好的指示作用。本文在成都市中心城区不同区域采集40件地表沉积物样品,利用激光粒度分析仪、能谱扫描电镜和X射线衍射等技术分析研究了地表沉积物的粒径分布特征、重金属分布特征、矿物组成特征及微区形貌特征。结果表明:地表沉积物粒径的质量和体积分布特征具有较高一致性,均以中细颗粒物为主,其中小于0.3mm的地表沉积物占总质量或体积的70%以上,小于0.125mm的地表沉积物占总质量或体积的40%左右;Cu、Pb、Zn、As、Hg、Cr、Cd、Ni等重金属随着沉积物粒径的减小而呈明显增加的趋势,主要存在于小于0.125mm粒径的沉积物中,同时在成都市中心城区各方位区域和各环路区域的分布上存在一定的差异;Si、Ca、K、Na等造岩元素在不同粒径级别沉积物中都大量存在;地表沉积物矿物组成主要是石英、长石类、方解石等,且各类矿物在不同粒径级别沉积物中所占含量大致相当,但细粒径矿物表现出胶体行为,极易吸附各种微量重金属。研究认为,城市地表沉积物的粒径分布特征和矿物组成特征是影响重金属在沉积物中分布的内在因素,而人类活动是决定地表沉积物重金属污染程度的关键因素。

关键词: 城市地表沉积物, 粒径分布, 重金属分布, 矿物组成, 形貌特征, 激光粒度分析仪, X射线衍射

The Heavy Metal Distribution and Mineralogical Characteristics of Surface Sediments in Chengdu City

KEY WORDS: urban surface sediments, particle size distribution, heavy metals distribution, mineral composition, topographic characteristics, Laser Particle Size Analyzer, X-ray Diffraction

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成都市中心城区地表沉积物中重金属分布及矿物学特征

徐国栋, 葛建华, 杜谷, 王以尧, 金斌, 董俊