摘要
选取南京市典型设施蔬菜生产系统为研究对象,研究了设施土壤-蔬菜系统中镉和汞的累积特征,评价了不同类型蔬菜中镉和汞的暴露风险,提出了基于健康风险的设施菜地土壤镉和汞的环境质量基准。结果表明:(1)设施菜地表层土壤中镉和汞产生了明显累积,且土壤汞的平均含量超过了温室蔬菜产地环境质量评价标准;(2)叶菜类蔬菜对镉和汞的富集能力最强,部分叶菜中的镉和汞含量超过了食品中污染物限量标准;(3)研究区有约21.2%的蔬菜具有镉的潜在人体摄入风险,蔬菜中汞的风险概率约为1%,不同蔬菜镉和汞的人体摄入风险排序为叶菜>根茎>茄果;(4)不同蔬菜类型土壤镉和汞的环境质量基准值差异较大,因此在今后的标准修订时可考虑针对不同蔬菜类型分别制定设施菜地土壤重金属环境质量基准。
In recent years,greenhouse vegetable production has been growing rapidly,making up a sizeable proportion of the vegetable production in China. Excessive uptake of heavy metals by vegetables may pose potential risks to human health. Therefore,vegetable safety has aroused increasing concerns in the country. To ensure food safety,it is essential to know how heavy metals（ Cd and Hg） accumulate in the greenhouse vegetable production system and pose health risks. The study on this subject may provide some scientific basis for heavy metals health risk assessment of Cd and Hg in the greenhouse vegetable system and decision-making in environmental management. Currently,the standard used for environment of environmental quality of greenhouse vegetable fields fails to take into account vegetable-type-specific bioavailability and human health risk of heavy metals. Hence,it is of critical importance to the management and production of safe greenhouse vegetables to have the standard for environmental quality evaluation of greenhouse vegetable fields established as soon as possible,based on crop-specific bioavailability and human health risks of heavy metals.For that end,a greenhouse vegetable production system typical of the Nanjing area was selected as a case for study on characteristics of Cd and Hg accumulation in the greenhouse soil-vegetable system,and exposure risks of Cd and Hg in vegetables relative to type,and environmental quality criteria were proposed for Cd and Hg in greenhouse vegetable fields based on the standard for vegetable and food hygiene and health risks of vegetable ingestion. Results show：（ 1） Cd and Hg accumulation was apparent in the topsoil of the greenhouse vegetable field,with the average content of Hg exceeding the Environment Quality Evaluation Standard for greenhouse vegetables production fields;（ 2） leafy vegetables were the highest in Cd and Hg enrichment capacity,and followed by root /tuber vegetables and then solanaceous vegetables; and some leafy vegetables were found to conta
出处
《土壤学报》
CAS
CSCD
北大核心
2014年第5期1045-1055,共11页
Acta Pedologica Sinica
基金
国家自然科学基金项目(41101491
U1202236)
环保公益性行业科研专项项目(201409044)资助
关键词
设施蔬菜产地
镉
汞
富集系数
健康风险评估
环境质量基准
Greenhouse vegetable fields Cd Hg Bioconcentration factor Health risk assessment Environmental quality criteria
