Nyamwamba河重金属迁移与George Ramsar湖泊湿地污染评估

发布时间：2018-01-15 23:20

本文关键词：Nyamwamba河重金属迁移与George Ramsar湖泊湿地污染评估　出处：《清华大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文主要研究了Kilembe矿山尾矿沿着Nyamwamba河到George Ramsar湖泊湿地重金属的迁移。采集了沿着Nyamwamba河七个不同位置的水、底泥沉积物和植物样品,测定了水、土壤和植物(毛里求斯芦苇)中铜、铅、镉、钴、底泥沉积物中铁和铬六种重金属的总浓度,从而评价其在George Ramsar湖泊湿地沿着河梯度的迁移和积累。同时也分析了水、土壤和沉积物中的有机质含量、pH值和电导率。研究结果显示,底泥沉积物中重金属的浓度范围如下:Cu=30.5-4308mg/kg,Cd=0.4-2.6 mg/kg,Pb=0.015-11.00 mg/kg,Co=0.017-381.3mg/kg,Cr=0.01-33.3 mg/kg,Fe=6649-15980 mg/kg。三个控制土壤样本和总重金属浓度范围如下:Cu=26.5-94.4 mg/kg,Cd=0.5-1.1 mg/kg,Pb=4.0-20.0 mg/kg,Co=0.016-0.084 mg/kg,Cr=0.01-0.03 mg/kg,Fe=6.649-15.98 mg/kg。水中总重金属的浓度是:Cu=0.099-0.112 mg/L,Cd=0.01 mg/L,Pb=0.08 mg/L,Co=0.03-0.13 mg/L,Cr=0.01-0.025mg/L,Fe=0.093-0.925 mg/L。水体中重金属的平均浓度低于控制土壤和沉积物样品。从Nyamwamba河进入George湖过程中水和沉积物中重金属的平均浓度增加。毛里求斯芦苇中重金属的平均浓度是:Cu=11.3-23 mg/kg,Fe=0.453-1.486 mg/kg,Cd=0.1 mg/kg,Pb=1-3 mg/kg,Cr=1.2-8.5 mg/kg,Co=1.9-6.8 mg/kg。从Nyamwamba河进入George湖后所有重金属的平均浓度都增加了。底泥沉积物和土壤的pH值是弱酸性的,而水是弱碱性的,具体pH值范围如下:底泥沉积物4.16-6.63,土壤6.29-6.63,水6.73-7.91。一般而言,水pH值高于土壤和底泥沉积物。另一方面,底泥沉积物、土壤和水的电导率值分别是16.5-498μS/cm,38.2-81.7μS/cm和38.5-279μS/cm。与水和土壤相比,底泥沉积物具有更高的电导率值。从Nyamwamba河进入George湖过程中水和沉积物的电导率值都增加了。底泥沉积物中有机物含量范围2.376 g/kg-234.298 g/kg,从Nyamwamba河进入乔治湖过程中其浓度有增加的趋势。
[Abstract]:This paper mainly studies the migration of Kilembe mine tailings along the Nyamwamba River to George Ramsar Lake wetland. Heavy metals were collected in seven different locations along the Nyamwamba river water, sediment and plant samples, the determination of water, soil and plant (Mauritius reed) in copper, lead, cadmium, cobalt, iron and chromium sediment concentration six kinds of heavy metals in sediments, and evaluate its in George Ramsar Lake Wetland along the river gradient migration and accumulation. Also analyzed the water content of organic matter in soil and sediment, pH and conductivity. The results show that the concentration range of heavy metals in sediments from the following: Cu=30.5-4308mg/kg, Cd=0.4-2.6 mg/kg, Pb=0.015-11.00 mg/kg. Co=0.017-381.3mg/kg, Cr=0.01-33.3 mg/kg, Fe=6649-15980 mg/kg. three control soil samples and total heavy metal concentration range is as follows: Cu=26.5-94.4 mg/kg, Cd=0.5-1.1 mg/kg, Pb =4.0-20.0 mg/kg, Co=0.016-0.084 mg/kg, Cr=0.01-0.03 mg/kg Fe=6.649-15.98 mg/kg., the concentration of total heavy metals in water are: Cu=0.099-0.112 mg/L, Cd=0.01 mg/L, Pb=0.08 mg/L, Co=0.03-0.13 mg/L, Cr=0.01-0.025mg/L, lower than that of control soil and sediment samples average concentration of heavy metal Fe=0.093-0.925 mg/L. in water. The increase in the average concentration of heavy metals in water and sediment of Lake George in the process from the Nyamwamba river. The average concentration of heavy metals in Mauritius reed is: Cu=11.3-23 mg/kg, Fe=0.453-1.486 mg/kg, Cd=0.1 mg/kg, Pb=1-3 mg/kg, Cr=1.2-8.5 mg/kg, Co=1.9-6.8 mg/kg. from the Nyamwamba River into Lake George after the average concentration of all heavy metals increased. Sediment and soil pH value is a weak acid, and water is alkaline, the specific value of pH the range is as follows: 4.16-6.63 sediment, soil 6.29-6.63, 6.73-7.91. and water Say, water pH value is higher than the soil and sediment. On the other hand, sediment, soil and water conductivity values were 16.5-498 S/cm, 38.2-81.7 S/cm and 38.5-279 S/cm. compared with water and soil, sediment has higher values of electrical conductivity. The conductivity of water and sediment into the lake George process from the Nyamwamba river the values are increased. The range of the content of organic matter in sediments from 2.376 g/kg-234.298 g/kg, from the Nyamwamba River into Lake George in the process of its concentration is increased.

【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X52;X53

【相似文献】