CAJ | 학술논문

采集珠三角地区主要工业区周边蔬菜产地土壤．研究土壤中铅（Pb）、镉（Cd）、汞（Hg）、砷（As）、铬（Cr）5种重金属的含量与分布特征。参照国家土壤环境质量标准（GB15618—1995）中的二级标准．采用单项污染指数法和综合污染指数法，对其重金属污染现状进行评价。结果表明：232份土壤样品中，Cd、Hg、As、Cr的超标率分别为45．06％、7．73％、5．15％和1．29％，未见Pb超标；37．34％的土壤受到不同程度的污染，Cd污染情况最为严重，№污染次之；土壤污染以单一重金属污染为主，未出现3种及以上重金属复合污染。各地污染状况呈现区域差异，东莞地区受污染的样品比例较大．珠海和广州的污染情况相对较轻。该区域的土壤重金属污染形势不容乐观．其可能给农业生产带来的风险应引起重视。
채집주삼각지구주요공업구주변소채산지토양．연구토양중연（Pb）、력（Cd）、홍（Hg）、신（As）、락（Cr）5충중금속적함량여분포특정。삼조국가토양배경질량표준（GB15618—1995）중적이급표준．채용단항오염지수법화종합오염지수법，대기중금속오염현상진행평개。결과표명：232빈토양양품중，Cd、Hg、As、Cr적초표솔분별위45．06％、7．73％、5．15％화1．29％，미견Pb초표；37．34％적토양수도불동정도적오염，Cd오염정황최위엄중，№오염차지；토양오염이단일중금속오염위주，미출현3충급이상중금속복합오염。각지오염상황정현구역차이，동완지구수오염적양품비례교대．주해화엄주적오염정황상대교경。해구역적토양중금속오염형세불용악관．기가능급농업생산대래적풍험응인기중시。
Soil samples were collected from vegetable fields around main industrial areas in the Pearl River Delta. The concentrations of lead （Pb）, cadmium （Cd）, mercury （Hg）, arsenic （As） and chromium （Cr） were studied. Their pollution status were evaluated according to class II of Soil Environmental Quality Standard （GB15618-1995）, using the single pollution index and comprehensive pollution index methods. The results indicated that the over standard rate of Cd, Hg, As, Cr was 45.06%, 7.73%, 5.15% and 1.29%, respectively, among the 232 soil samples, and no samples showed Pb concentration exceeding the threshold. 37.34% of the soil samples had been polluted at different degrees, and Cd was the main contributor, followed by Hg. Soil polluted by three or more heavy metals were not observed. Soil pollution situation presented regional differences： the proportion of contaminated samples in Dongguan area was larger, whereas the pollution situation in Zhuhai and Guangzhou was better. Heavy metal pollution status of soils around industrial areas is not optimistic, which should be paid enough attention.