生态环境学报 ›› 2023, Vol. 32 ›› Issue (12): 2083-2093.DOI: 10.16258/j.cnki.1674-5906.2023.12.001

• “新污染物”研究专栏 •    下一篇

农用地土壤中邻苯二甲酸二乙基已基酯的污染现状及生态风险评估

胡习邦(), 关晓彤, 谢紫霞, 张修玉*()   

  1. 广东省环境科学研究院,广东 广州 510045
  • 收稿日期:2023-08-13 出版日期:2023-12-18 发布日期:2024-02-05
  • 通讯作者: *张修玉。E-mail: zhangxiuyu@126.com
  • 作者简介:胡习邦(1981年生),男,高级工程师,博士,主要从事生态风险研究。E-mail: hooyan@126.com
  • 基金资助:
    国家重点研发计划项目(2019YFC1803901);广东省环保专项资金项目(粤财资环[2023]12号)

Pollution Status and Ecological Risk Assessment of Diethylhexyl Phthalate in Agricultural Soil

HU Xibang(), GUAN Xiaotong, XIE Zixia, ZHANG Xiuyu*()   

  1. Guangdong Academy of Environmental Sciences, Guangzhou 510045, P. R. China
  • Received:2023-08-13 Online:2023-12-18 Published:2024-02-05

摘要:

邻苯二甲酸二乙基已基酯(Diethylhexyl phthalate,DEHP)广泛存在于各种环境介质中,且非常容易累积在土壤环境中,通过多种途径进入生态系统循环,并沿着食物链传递影响人体健康。中国尚未出台DEHP基于农用地安全的生态阈值基准,因此,开展DEHP农用地土壤生态风险和生态安全等研究非常必要。通过从国内外数据库和相关文献中筛选出土壤酶反应活性、植物、无脊椎动物和脊椎动物等15种为代表性物种陆地生物最敏感测试终点毒性数据,应用物种敏感性分布(Species Sensitivity Distribution,SSD)方法构建了DEHP对陆生生物的SSD曲线;计算了DEHP对不同陆生生物的5%危害浓度(HC5),分析比较DEHP对不同生物类别的毒性敏感性差异及其特征,并利用风险商(RQ)评价了中国不同地区土壤环境DEHP对不同生物类别的生态风险。结果表明,中国不同地区农用地中DEHP的污染程度差异较大,其平均质量分数范围为0-18.3 mg∙kg−1,平均质量分数较高的地区从高到低依次为:青岛 (18.3 mg∙kg−1)>贵州 (14.3 mg∙kg−1)>广州 (8.87 mg∙kg−1)>大连 (2.84 mg∙kg−1)>杭州 (1.48 mg∙kg−1)>南京 (1.37 mg∙kg−1)>重庆 (1.04 mg∙kg−1)。基于发育、繁殖和行为等慢性毒性数据推导出的预测无效应浓度(PNEC)为1.24 mg∙kg−1;各地区的DEHP慢性毒性的风险商值范围为0-14.7,中国不同地区土壤存在一定的生态风险差异,青岛、贵州等地调查点农用地土壤生态风险商(RQ)较高,分别为14.7、11.5,表明生态风险较高,但大部分地区生态风险较低。该研究通过采用SSD方法推导DEHP农用地生态环境基准,可为农用地土壤生态风险评估与管控提供技术支持。

关键词: 邻苯二甲酸二乙基已基酯, 物种敏感性分布, 生态风险, 生态毒理效应, 农用地土壤

Abstract:

Diethylhexyl phthalate (DEHP) is widely distributed in various environmental media and easily accumulated in soil environment. DEHP can be transported into the ecosystem through multiple pathways, which may be harmful for human health along the food chain. The DEHP ecological benchmark based on agricultural land security has not been announced in China. Therefore, it is necessary to research on ecological risks and safety of DEHP in agricultural soil. The most sensitive endpoint toxicity data of terrestrial organisms were obtained by selecting 15 representative species from domestic and foreign databases and relevant literature, including soil enzyme reaction activity, plants, invertebrates, and vertebrates. Species sensitivity distributions (SSD) method was applied to construct the SSD curve of DEHP on terrestrial organisms. The 5% of hazardous concentration (HC5) for DEHP on different terrestrial species was calculated, and the differences in toxicity sensitivity and characteristics of DEHP to different terrestrial organisms was analyzed and compared. The ecological risks of DEHP in soil environments of regions of China for different biological categories were evaluated by using Risk Quotient (RQ). The results showed that the pollution level of DEHP in agricultural soil was greatly diverse in different regions of China, with an average concentration ranged from 0 to 18.3 mg∙kg−1. The higher regions in descending order were: Qingdao (18.3 mg∙kg−1)>Guizhou (14.3 mg∙kg−1)>Guangzhou (8.87 mg∙kg−1)>Dalian (2.84 mg∙kg−1)>Hangzhou (mg∙kg−1)>Nanjing (1.37 mg∙kg−1)>Chongqing (1.04 mg∙kg−1). Predicted no effect concentration (PNEC) derived on the basis of chronic toxicity data was 1.24 mg∙kg−1. The RQ of RQ based on chronic toxicity data was between 0 and 14.7. The soil ecological risk quotient of agricultural land in survey areas such as Qingdao and Guizhou were relatively high, with values of 14.7 and 11.5, respectively, indicating that a higher ecological risk of DEHP in Qingdao and Guizhou, while agricultural soil in most areas were lower. This study was deduced an ecological environment benchmark for DEHP by using SSD method, which provided some technical supporting for agricultural soil ecological risk assessment and management.

Key words: DEHP pollution, species sensitivity distributions (SSD), ecological risks, ecotoxicological effect, agricultural soil

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