摘要
骆马湖作为南水北调东线工程重要的调蓄湖泊和水源地,其水环境安全对于江苏北部乃至南水北调东线工程的影响深远。通过对骆马湖湖区及入湖河段表层沉积物、湖周地区环境中潜在污染源土壤的Pb浓度和Pb同位素组成进行分析,评估Pb的空间分布;利用富集系数法进行Pb生态风险评价,结合二元线性混合模型进行湖区表层沉积物Pb来源解析,并计算各污染源的相对贡献率。结果表明:骆马湖表层沉积物中Pb浓度为8.09~27.97 mg/kg,平均值为20.94 mg/kg,Pb污染程度为清洁~轻度富集,表层沉积物Pb污染主要集中在东部和北部湖区;表层沉积物Pb同位素中^(206)Pb/^(207)Pb与^(208)Pb/(^(206)Pb+^(207)Pb)(丰度之比)分别为1.170~1.249和1.125~1.131,Pb污染主要来源于老沂河和以渔业养殖为主的农业污染的直接排放,农业源的相对贡献率为46.71%。为防控骆马湖水环境中Pb的污染风险,需加强对渔业养殖的规范化管理和入湖河流的污染管控。
As an important storage lake and water source of the east route of South-to-North Water Transfer Project,Luoma Lake's water environment safety has a far-reaching impact on northern Jiangsu and even the east route of South-to-North Water Transfer Project.By analyzing the Pb content and Pb isotopic composition of the surface sediments of Luoma Lake and rivers into the lake,and the soil of potential pollution sources in the surrounding areas,the spatial distribution of lead was evaluated.The ecological risk assessment of heavy metal Pb was carried out by using the enrichment coefficient method,and the binary linear mixed model was applied to analyze the polluting sources and calculate the relative contribution rate of each source.The results showed that the content of Pb in surface sediments of Luoma Lake ranged from 8.09 to 27.97 mg/kg,with an average of 20.94 mg/kg,and Pb in surface sediments of Luoma Lake showed a clean-slight pollution level.Spatial analysis showed that Pb pollution of surface sediments in Luoma Lake was mainly concentrated in the eastern and northern lakes.The values of ^(206)Pb/^(207)Pb and ^(208)Pb/(^(206)Pb+^(207)Pb)(the ratios of abundance)in the surface sediments of Luoma Lake were 1.170-1.249 and 1.125-1.131,respectively,and the Pb pollution mainly came from the Laoyi River and the direct discharge of agricultural pollution from fishery farming.The relative contribution rate of agricultural sources was 46.71%.In order to prevent and control the pollution risk of Pb in Luoma Lake water environment,it was necessary to strengthen the standardized management of fishery culture and the pollution control of rivers entering the lake.
作者
张家根
夏建东
陈书琴
武宇圣
庞燕
黄天寅
ZHANG Jiagen;XIA Jiandong;CHEN Shuqin;WU Yusheng;PANG Yan;HUANG Tianyin(School of Environmental Science and Engineering,Suzhou University of Science and Technology;National Engineering Laboratory for Lake Water Pollution Control and Ecological Restoration Technology,Chinese Research Academy of Environmental Sciences;National Key Laboratory of Lake Pollution Control of Environmental Protection,Chinese Research Academy of Environmental Sciences;College of Resources and Environment,Anqing Normal University)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2023年第3期1011-1020,共10页
Journal of Environmental Engineering Technology
基金
国家水体污染控制与治理科技重大专项(2017ZX07301-006-06)。
关键词
铅同位素
骆马湖
沉积物
重金属
源解析
lead isotope
Luoma Lake
sediment
heavy metals
source analysis
