摘要
为探讨风扰动对沉积物重金属分布变化的影响,本文研究太湖梅梁湾沉积物在10种不同风扰动条件下的重金属总量变化和形态变化。研究结果显示,随着风扰动的不断增强,太湖梅梁湾沉积物6种典型重金属Cd、Pb、Cr、Ni、Cu、Zn的总量出现下降趋势。沉积物中重金属形态提取采用BCR分级提取法,按照不稳定态(可交换态+可还原态+可氧化态)的比例,重金属从大到小的排列顺序为Cd>Zn>Ni>Cu>Pb>Cr,说明太湖梅梁湾沉积物中Cd向水体迁移的能力最强,Cr向水体迁移的能力最弱。随着风扰动的增强,表层沉积物的活动愈加剧烈,不稳定态重金属释放进入水体的概率大大增加,引起生态风险。
In order to explore the impact of wind disturbance on the distribution changes of heavy metals in sediments,this paper studies the total amount and form changes of heavy metals in the sediments of Meiliang Bay of Taihu Lake under 10 different wind disturbance conditions.The study results show that with the increasing wind disturbance,the total amount of six typical heavy metals such as Cd,Pb,Cr,Ni,Cu and Zn in the sediments of Meiliang Bay of Taihu Lake shows a downward trend.The form of heavy metals in the sediment is extracted by BCR grading extraction method,according to the proportion of unstable state(exchangeable state+reducible state+oxidizable state),the heavy metals are arranged in the order of Cd>Zn>Ni>Cu>Pb>Cr,indicating that in the sediment of Meiliang Bay of Taihu Lake,Cd has the strongest ability to migrate to the water body,while Cr has the weakest ability to migrate to the water body.With the enhancement of wind disturbance,the activity of surface sediment becomes more intense,and the probability of unstable heavy metals releasing into water bodies greatly increases,causing ecological risks.
作者
郑莎莎
ZHENG Shasha(Jiangsu Union Technical Institute,Nanjing Branch Institute,Nanjing 210019,China)
出处
《中国资源综合利用》
2023年第10期59-63,共5页
China Resources Comprehensive Utilization
基金
江苏省高等学校基础科学(自然科学)面上项目(21KJB610012)。
关键词
风扰动
太湖
沉积物
重金属
分布变化
wind disturbance
Taihu Lake
sediments
heavy metals
distribution changes
