摘要
为了解青藏高原东缘城市绿地表层土壤的汞污染水平及其潜在生态风险,在四川和云南不同海拔的8个城市使用五点采样法采集土壤样品并测定其总汞含量。分别采用地累积指数、单因子指数、潜在生态危害指数等方法对土壤汞的污染程度、潜在生态风险进行评估,并使用健康风险模型进行风险计算和评价。结果表明:各城市土壤汞浓度的几何平均数为:平武县(0.113 mg·kg^(-1))>九寨沟县(0.101 mg·kg^(-1))>康定市(0.090 mg·kg^(-1))>玉龙县(0.073 mg·kg^(-1))>永仁县(0.052 mg·kg^(-1))>绥江县(0.050 mg·kg^(-1))>甘孜县(0.042 mg·kg^(-1))>元谋县(0.029 mg·kg^(-1));所有土壤样本没有受到污染或污染程度较低;潜在风险以轻微和中等生态风险等级为主,占比分别为53.1%和31.3%;8个城市的土壤汞的总非致癌危险指数均低于1,说明对人体均不存在非致癌风险。
In order to understand the mercury contamination and potential ecological risk of urban green space topsoil at the eastern margin of Qinghai-Tibet Plateau,soil samples from eight cities at different altitudes in Sichuan and Yunnan are collected and the total mercury content is determined by five-point sampling.The degree of mercury contamination and potential ecological risks are assessed by the index of geoaccumulation,single factor contaminant index and the potential ecological risk index,respectively.Meanwhile,the risk calculation and evaluation are carried out by the health risk appraisal.The results show as follows:the median soil mercury concentration of these cities is in the sequence of Pingwu county(0.113 mg·kg^(-1))>Jiuzaigou county(0.101 mg·kg^(-1))>Kangding city(0.090 mg·kg^(-1))>Yulong county(0.073 mg·kg^(-1))>Yongren county(0.052 mg·kg^(-1))>Suijiang county(0.050 mg·kg^(-1))>Ganzi county(0.042 mg·kg^(-1))>Yuanmou county(0.029 mg·kg^(-1));all soil samples are not contaminated or less contaminated;the main potential risks are at mild and medium ecological risk levels,accounting for 53.1%and 31.3%respectively;the total non-carcinogenic risk index of soil mercury in 8 cities is lower than 1,indicating that there is no non-carcinogenic risk to humans.
作者
熊敏
桑语
黄相钦
罗怡
周昭敏
XIONG Min;SANG Yu;HUANG Xiang-qin;LUO Yi;ZHOU Zhao-min(College of Life Science,China West Normal University,Nanchong Sichuan 637009,China)
出处
《西华师范大学学报（自然科学版）》
2023年第4期333-341,共9页
Journal of China West Normal University(Natural Sciences)
基金
国家自然科学基金青年项目(31600412)
西华师范大学青年教师科研资助项目(19D044)
大学生创新创业训练计划项目(S202010638081)
西华师范大学大学生创新创业训练计划项目(cxcy2022190)。
关键词
青藏高原东缘
城市绿地
汞污染
风险评估
the eastern margin of Qinghai-Tibet Plateau
urban green space
mercury contamination
risk assessment
