CAJ | 학술논문

天津地处九河下梢,承纳了当地及北京等地区的大量污水,污灌历史长、面积大,其污灌区土壤与蔬菜的重金属污染一直是人们关注的问题.对在市郊采集的9个采样点的土壤和蔬菜样品进行了重金属含量分析,并分别采用内梅罗综合污染指数法和单因子指数法对土壤和蔬菜重金属污染进行评价.结果表明,采样点土壤重金属污染严重,均以Cd污染为主,综合污染指数均超过警戒线,最高达22.01.根茎类、茄果类、瓜类蔬菜均受到Pb、Cd、Se、As的严重污染且超标率较高,污染指数均超过3.00,叶菜类蔬菜受Se、As、Pb的污染也很严重.津郊污灌区土壤和蔬菜重金属污染严重,污水灌溉是造成污染的主要原因,应该加以控制和治理.蔬菜对不同重金属元素的富集能力不同,葱、蒜对大多数重金属元素具有较强的富集能力,可考虑作为土壤修复的备选植物.
천진지처구하하소,승납료당지급북경등지구적대량오수,오관역사장、면적대,기오관구토양여소채적중금속오염일직시인문관주적문제.대재시교채집적9개채양점적토양화소채양품진행료중금속함량분석,병분별채용내매라종합오염지수법화단인자지수법대토양화소채중금속오염진행평개.결과표명,채양점토양중금속오염엄중,균이Cd오염위주,종합오염지수균초과경계선,최고체22.01.근경류、가과류、과류소채균수도Pb、Cd、Se、As적엄중오염차초표솔교고,오염지수균초과3.00,협채류소채수Se、As、Pb적오염야흔엄중.진교오관구토양화소채중금속오염엄중,오수관개시조성오염적주요원인,응해가이공제화치리.소채대불동중금속원소적부집능력불동,총、산대대다수중금속원소구유교강적부집능력,가고필작위토양수복적비선식물.
Tianjin located in the downstream of many rivers and is loaded with sewage from local, Beijing and other districts. The history of sewage irrigation is long and the sewage irrigation area is large, so great attention has been paid to heavy metal pollution in soils and vegetables in sewage irrigation region. Soils and vegetables of nine sampling sites were collected, and in which the concentrations of heavy metals were investigated. Heavy metal pollution of soils and vegetables were assessed with Nemerow index and single-factor index respectively. The results showed that the heavy metal pollution was very serious and the main pollution of soils came from Cd, their Nemerow index exceeded security limit, up to 22.01. The vegetables excluding leaf-vegetables suffered serious contamination from Pb、Cd、Se、As with higher rate of excess standard. Their single-factor index were higher than 3.00. Serious contamination from Se、As、Pb was also occurred in leaf-vegetables. Heavy metal pollution was prevalent and serious in sewage irrigation regions in Tianjin suburbs. The main reason of pollution was sewage irrigation, which should be controled and treated. The vegetables had different bioaccumulation abilities. Onion and garlic could be cultivated as alternative plants for soil bioremediation because they could easily concentrate heavy metals from soil irrigated by sewage.