CAJ | 학술논문

重金属元素铅的危害已经引起人们的广泛关注.为了解东莞市农业土壤和蔬菜铅污染的状况,选取了该市118个农业土壤样品和43个蔬菜样品进行铅含量分析.研究发现,东莞市农业土壤铅含量普遍较高,92.4%的样点铅含量超过国家土壤环境质量一级标准,79.7%的样点铅含量高于东莞市背景值,且变异程度较大,土壤铅含量最大值(140.58mg/kg)为最小值(20.36mg/kg)的7倍.各区域农业土壤铅污染程度各异,依据土壤铅含量高低可作如下排序:西部平原区>中部过渡区>东南丘陵区>环境保护区.根据分析,东莞市土壤铅的污染源主要为工业企业"三废"的排放、含铅农药和肥料的大量使用、汽车尾气的排放和大气沉降等.东莞市蔬菜铅含量超标比较严重,特别是油麦菜和生菜,超标率分别达到42.8%和37.5%.不同品种蔬菜对土壤铅的富集能力不同,富集能力顺序依次为:生菜>菠菜>芥菜、油麦菜、白菜>菜心、芹菜.
중금속원소연적위해이경인기인문적엄범관주.위료해동완시농업토양화소채연오염적상황,선취료해시118개농업토양양품화43개소채양품진행연함량분석.연구발현,동완시농업토양연함량보편교고,92.4%적양점연함량초과국가토양배경질량일급표준,79.7%적양점연함량고우동완시배경치,차변이정도교대,토양연함량최대치(140.58mg/kg)위최소치(20.36mg/kg)적7배.각구역농업토양연오염정도각이,의거토양연함량고저가작여하배서:서부평원구>중부과도구>동남구릉구>배경보호구.근거분석,동완시토양연적오염원주요위공업기업"삼폐"적배방、함연농약화비료적대량사용、기차미기적배방화대기침강등.동완시소채연함량초표비교엄중,특별시유맥채화생채,초표솔분별체도42.8%화37.5%.불동품충소채대토양연적부집능력불동,부집능력순서의차위:생채>파채>개채、유맥채、백채>채심、근채.
This paper describes an investigation of lead pollution in Dongguan city with regard to agricultural soil and vegetables, during which 118 topsoil samples and 43 vegetable samples were collected and analyzed. Result reveals that in general the topsoil of the farmland has been polluted with lead levels exceeding Grade I of the national environmental quality standard of soft, and 79.75% of the samples having higher lead levels than the soil background value of lead in Dongguan. As to vegetables, the investigation also found pretty high lead levels in the vegetable samples, especially of Brassica campestris and Romaine lettuce exceeding the relevant national standard. The source of lead contamination is discussed, which involves industrial wastes, Pb-containing pesticides and fertilizer as well as car exhaust emissions.