摘要
采集武夷山市五夫镇白莲荷塘底泥和莲子、莲叶样品,检测Cu、Zn、Pb、Cr、Cd、As和Hg等7种重金属含量,并运用单项和内梅罗综合污染指数法评价生态风险及分析莲不同部位的富集系数。结果表明:底泥Cd和Hg超出《无公害农产品—种植业产地环境条件》标准限值;莲子和莲叶重金属分别符合《食品中污染物限量》、《绿色食品—茶叶》和《茶叶中铬、镉、汞、砷及氟化物限量》标准,两者富集系数存在显著差异,尤其莲叶对Hg强富集。不同生态型荷塘的底泥、莲子、莲叶中重金属综合污染指数均值排序一致,都为自然种植型荷塘<人为管理型荷塘<游览干预型荷塘。研究建议今后应加强荷塘底泥Cd和Hg污染源调查及选址评估,尽量降低农业、生活和交通污染影响。
Samples of sediment as well as seeds and leaves of the lotus grown in the pond at Wufu,downtown of Wuyishan city,were collected for this study.Contents of 7 heavy metals,including Cu,Zn,Pb,Cr,Cd,As and Hg,were determined.The ecological risk by the metals was evaluated based on the single pollution index,the comprehensive pollution index,and the enrichment coefficient of the lotus parts.The results showed that the Cd and Hg contents in the sediment exceeded the national standard limits set forth by the Environmental Conditions for Non-Pollution Agricultural Products Production Area.The heavy metals in the lotus seeds and leaves were within the Maximum Allowable Levels of Pollutants in Food,Green Food-Tea,and the Maximum Allowable Levels of Cr,Cd,Hg,As,and F in Tea.Significant differences existed in the enrichment coefficients on the two metals,especially Hg,in the lotus leaves.The average comprehensive pollution indices of the sediment,lotus seeds and leaves from ponds of different types exhibited a similar trend,that is,in an increasing order of:natural growing pond<managed pond<tourism-oriented pond.Thus,reinforced pollutant monitoring and control on pond sediment to mitigate the potential harms to the environment and consumer health by Cd and Hg at the locations was strongly recommended.
作者
叶宏萌
李国平
袁旭音
朱惠琼
林国锦
王胜艳
YE Hong-meng;LI Guo-ping;YUAN Xu-yin;ZHU Hui-qiong;LIN Guo-jing;WANG Sheng-yan(School of Ecology and Resource Engineering,Wuyi University,Wuyishan,Fujian 354300,China;Fujian Key Laboratory of Eco-Industrial Green Technology,Wuyishan,Fujian 354300,China;Taizhou Brach of Hydrology and Water Resources Investigation Bureau of Jiangsu Province,Taizhou,Jiangsu 225300,China)
出处
《福建农业学报》
CAS
北大核心
2018年第1期73-80,共8页
Fujian Journal of Agricultural Sciences
基金
福建省科技厅星火项目(2016S0059)
福建省生态产业绿色技术重点实验室项目(WYKF2017-12)
武夷学院科研基金项目(XD201702)
福建省教育厅A类科技项目(JAT170591)
南平市重点科技计划项目(N2017T02)
关键词
重金属
莲子
莲叶
底泥
富集系数
heavy metals
lotus seed
lotus leaf
sediment
enrichment coefficient
