文章摘要
邓杰帆 1 ,吴翠玉 2,卢  瑛 2 ,李军辉 2,曾彩明 1 ,刘金环 2,刘纪蓥 2,贾重建.东莞某工业镇农用地土壤镉污染及生态风险评价[J].广东农业科学,2019,46(3):78-84
东莞某工业镇农用地土壤镉污染及生态风险评价
Soil Cadmium Pollution and Ecological Risk Assessment of Agricultural Land in an Industrial Town of Dongguan
  
DOI:10.16768/j.issn.1004-874X.2019.03.013
中文关键词: 农用地    土地利用方式  污染程度  潜在生态风险评价
英文关键词: agricultural soil  Cd  land uses  pollution degree  potential ecological risk assessment
基金项目:广东省科技计划项目( 2013B020700002)
作者单位
邓杰帆 1 ,吴翠玉 2,卢  瑛 2 ,李军辉 2,曾彩明 1 ,刘金环 2,刘纪蓥 2,贾重建 1. 东莞市环境科学研究所广东 东莞 5230092. 华南农业大学资源环境学院广东 广州 510642 
摘要点击次数: 97
全文下载次数: 52
中文摘要:
      【目的】通过调查东莞某工业镇农用地土壤、农产品镉(Cd)污染特征,以期有效防治 Cd污染。【方法】 采集不同土地利用方式(菜地、果园、林地、荒地)123 个表层土壤样品及 27 个农产品(叶菜类、茄果类、水果类), 采用石墨炉原子吸收法测定土壤和农产品可食部分的 Cd 含量,利用单因子指数法、地累积指数法和潜在生态指 数法进行分析评价。【结果】研究区域土壤 Cd 的平均含量为 0.36 mg/kg(0.02~1.52 mg/kg),有 91.06% 的样点 土壤 Cd 含量高于广东省自然背景值(0.056 mg/kg);48.78% 的样点 Cd 含量高于农用地土壤污染风险管控标准 筛选值(0.3 mg/kg,pH>7.5 时为 0.6 mg/kg,GB 15618-2018);农产品中 Cd 含量平均值(0.013 mg/kg)低于食 品安全国家标准中规定的蔬菜 Cd 含量限值(0.05 mg/kg),但有部分蔬菜超标,超标达 11.11%;不同利用方式 土壤 Cd 含量、污染指数、地累积指数、潜在生态危害指数平均值大小均为:菜地 > 林地 > 果园 > 荒地,且菜地 与其他 3 种利用方式差异显著。【结论】研究区域土壤 Cd 含量呈明显的累积现象,48.78% 的土壤存在污染风险; 农产品中 Cd 含量对人群存在健康风险;不同利用方式对土壤 Cd 的累积造成不同程度的影响,菜地最为严重。
英文摘要:
      【Objective】The objective was to find a way to effectively prevent and control cadmium (Cd) pollution by investigating the characteristics of Cd pollution in agricultural soils and agro-products in an industrial town of Dongguan.【Method】A total of 123 surface soil samples and 27 agro-products(leaf vegetables, solanaceous fruits, and fruits) from different land uses(vegetable field, orchard, woodland and waste land) were collected and the Cd content of soils and and the edible part of agro-products were determined by using graphite furnace atomic absorption spectroscopy, and were analyzed and evaluated by using using single factor index, geo-accumulation index and potential ecological risk index .【Results】Results showed that the average concent of Cd in tested soils was 0.36 mg/kg (0.02-1.52 mg/ kg), and the Cd content of 91.06% sample soil was higher than the natural background value of Guangdong Province (0.056 mg/kg). The Cd content of 48.78% of the sample soil was higher than the screening value of the soil pollution risk management standard for agricultural land (0.3 mg/kg, 0.6 mg/kg at pH>7.5). The average concent of Cd in agro-products (0.013 mg/kg) was lower than the maximum allowable concent in vegetables (0.05 mg/kg) specified in the national food safety standards, but some vegetables exceeded the standard by 11.11%. The average concent of Cd, pollution index, geoaccumulation index and potential ecological risk index of vegetable plot were higher those of woodland, those of woodland were higher those of orchard, those of orchard were higher those of wasteland, and the vegetable land differed markedly with other three lands. 【Conclusions】The Cd concent in soil of the study area showed obvious accumulation, and 48.78% of the soil had pollution risk. The Cd content in agricultural products poses a health risk to human. The concent of Cd in soils varied in different land use types, while the highest Cd concent was observed in vegetable field.
查看全文   查看/发表评论  下载PDF阅读器

手机扫一扫看