城市红树林表层沉积物微量金属的环境质量矿物学分析

Environmental Quality Mineralogical Analysis of Trace Metals in Urban Mangrove Surface Sediments

选择深圳市福田、坝光、沙井和西乡4个典型样地,测定红树林表层沉积物的矿物组分和微量金属元素含量,采用矿物学评价体系探究矿物组成对微量金属富集的影响。结果表明,深圳城市红树林表层沉积物矿物组成以黏土矿物和石英为主,样地间存在差异;沙井红树林微量金属污染最严重,西乡和福田红树林次之,坝光红树林污染程度最轻,多种微量金属的富集受到人类活动影响;微量金属的富集与沉积物矿物组分相关,石膏和黏土矿物具有较高的微量金属富集能力。

Mineral composition and trace metal elements content of mangrove surface sediments were measured in Futian,Baguang,Shajing and Xixiang district in Shenzhen city.The mineralogical evaluation system was used to explore the relationship between mineral composition and trace metal enrichment.The results showed that the mineral composition of surface sediments of Shenzhen urban mangrove was mainly clay minerals and quartz and there were variation among sample sites.The trace metal pollution in Shajing mangrove was the most serious,followed by Xixiang mangrove and Futian mangrove,and Baguang mangrove was the least serious.The enrichment of trace metal was affected by human activities.The enrichment of trace metals was related to the mineral composition of sediments.Gypsum and clay minerals had stronger trace metal enrichment ability.