亳州市土壤-白芍典型重金属含量分布及风险评价  

Distribution and risk assessment of typical heavy metals in soil-Paeoniae Radix Alba in Bozhou City

作　　者：贺芳 汤泉[1] 郑刘根 刘桂建[3] 王玲玲 HE Fang;TANG Quan;ZHENG Liugen;LIU Guijian;WANG Lingling(School of Life Sciences,Anhui University,Hefei,230601,China;Anhui Province Engineering Laboratory for Mine Ecological Remediation,Hefei,230601,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei,230026,China;Anhui Research Academy of Environmental Sciences,Hefei,230022,China)

机构地区：[1]安徽大学生命科学学院,合肥230601 [2]安徽省矿山生态修复工程研究中心,合肥230601 [3]中国科学技术大学地球与空间科学学院,合肥230026 [4]安徽省环境科学研究院,合肥230022

出　　处：《环境化学》2025年第1期187-198,共12页Environmental Chemistry

基　　金：国家自然科学基金(42072200)资助.

摘　　要：以亳州市谯城区为研究区域,采集了143组白芍及根际土壤样品,分析了土壤和白芍中典型重金属Cd、Cr、Ni的含量,并采用单因子污染指数法(P_(i))、潜在生态风险指数法(RI、E_(i))和生物富集系数(BCR)评价土壤重金属污染和白芍重金属富集特征.同时,利用危害商值、靶器官毒性剂量法、致癌风险值和蒙特卡洛模拟等方法对白芍中Cd、Cr、Ni对人体健康的风险进行评估.研究结果显示,土壤中Cd、Cr、Ni的含量范围分别为0.09—0.42、24.07—117.13、26.74—62.96 mg·kg^(−1).P_(i)值显示Cd污染程度最为严重;RI值表明研究区土壤的潜在生态风险水平较低;BCR结果表明相较于Cr和Ni,白芍更容易富集Cd.人体健康风险评估结果显示,白芍中Cd、Cr、Ni的非致癌风险值均小于1,但靶器官毒性剂量法修正后的非致癌健康风险值结果高于传统的危害商值法,尤其是对于Cr造成的非致癌风险明显提高;致癌风险值在1×10^(−6)至1×10^(−4)之间,均处于可接受范围内;利用蒙特卡洛模拟进行不确定性分析,对非致癌健康风险和致癌风险的评估结果与确定性评估一致.结果表明,亳州市谯城区的土壤和白芍中重金属污染程度较低,白芍中典型重金属Cd、Cr、Ni产生的人体健康风险也处于可接受水平.143 sets of Paeoniae Radix Alba and rhizosphere soil samples were collected from Qiaocheng District,Bozhou City.The contents of typical heavy metals(e.g.,Cd,Cr,and Ni)in soils and Paeoniae Radix Alba were determined.The heavy metal pollution in soils were evaluated by using the methods of single-factor pollution index(P_(i))and potential ecological risk index(RI,Ei),while the enrichment characteristics of heavy metal in Paeoniae Radix Alba were assessed by bioconcentration coefficients(BCR).Simultaneously,hazard quotients(HQ),target organ toxic dose method(TTD),carcinogenic risk values(CR),and Monte Carlo simulation were employed to assess the risks of Cd,Cr,and Ni in Paeoniae Radix Alba to human health.The results revealed that the contents of Cd,Cr,and Ni in the soil ranged from 0.09 mg·kg^(−1)to 0.42 mg·kg^(−1),24.07 mg·kg^(−1)to 117.13 mg·kg^(−1),and 26.74 mg·kg^(−1)to 62.96 mg·kg^(−1),respectively.The P_(i) values indicated that Cd pollution was the most severe.The RI values indicated that the potential ecological risk level in the research area's soil was relatively low.The BCR results suggested that Cd had a higher tendency to accumulate in Paeoniae Radix Alba when comparing to Cr and Ni.The human health risk assessment results showed that the non-carcinogenic risk values of Cd,Cr,and Ni in Paeoniae Radix Alba were all below 1.However,the non-carcinogenic health risk values obtained through TTD were higher than those obtained through the HQ,especially for Cr,which significantly increased the non-carcinogenic risk.The CR values ranged from 1×10^(−6)to 1×10^(−4),all within an acceptable range.Uncertainty analysis using Monte Carlo method showed consistent results with deterministic assessments for both non-carcinogenic and carcinogenic health risks.Overall,the levels of heavy metal pollution in soils and Paeoniae Radix Alba were relatively low in the studied areas.Moreover,the human health risks caused by Cd,Cr,and Ni in Paeoniae Radix Alba were within acceptable levels.

关 键 词：土壤 白芍 重金属 生态风险评价 人体健康风险评估 靶器官毒性剂量法 蒙特卡洛 模拟 

分 类 号：X-1[环境科学与工程] O6[理学—化学]