| 辽宁省阜新市主城区表土磁化率与重金属特征及关系的定量分析 |
| |
| 引用本文： | 王天依,潘颖,于淼.辽宁省阜新市主城区表土磁化率与重金属特征及关系的定量分析[J].环境科学研究,2021,34(11):2722-2730. |
| |
| 作者姓名： | 王天依 潘颖 于淼 |
| |
| 作者单位： | 辽宁师范大学地理科学学院,辽宁 大连 116029;阜新市高级中学,辽宁 阜新 123000 |
| |
| 基金项目： | 国家自然科学基金项目42071013辽宁师范大学博士启动科研基金项目BS2018L014辽宁师范大学博士启动科研基金项目2021BSL015 |
| |
| 摘 要： | 煤炭城市表土的磁学特征与重金属累积存在密切联系，但其确切的数量关系仍然模糊.以阜新市主城区表土（0~20 cm）为研究对象，通过对磁化率及重金属（Cu、Zn、Cd、Hg）含量的测试以及空间插值分析，系统分析了表土的磁化率特征、重金属富集特征，并运用通径分析明确了二者的数量关系.结果表明:①阜新市主城区表土质量磁化率（χlf）、频率磁化率（χfd）平均值分别为196.88×10-8 m3/kg、2.41%，二者变异程度均较高；χlf高值主要集中在主城区的中心（围绕海州露天煤矿）及西北部，而χfd高值区则大体与χlf低值区对应，且呈斑状分布的格局特点.②Cu、Zn、Cd、Hg的平均含量分别为45.13、107.96、0.13、0.11 mg/kg，且点源污染特征明显；其中，Cu、Zn、Cd的富集多集中于经济活动频繁的主城区中心区域及海州露天矿的周边地带，Hg含量的高值区主要沿着细河呈东北-西南方向的带状分布特征.③主城区表土χlf与Cu、Zn、Cd的含量均呈显著正相关，且χlf与Zn、Cu含量存在χlf=-161.122+1.437Zn]+4.729Cu]的数量关系；χfd与Zn、Cd含量均呈显著负相关，且χfd与Cd含量存在χfd=3.720-10.154Cd]的线性关系.研究显示，阜新市主城区表土重金属存在明显富集，其中，Cu、Zn、Cd的累积程度与磁化率呈显著相关，在城市表土环境的监测治理工作中，宜采用简便快捷的磁化率测试以指示相应重金属的富集状况.
|
| 关 键 词： | 阜新市 表土 磁化率 重金属 相关性 通径分析 |
| 收稿时间： | 2021-04-21 |
Quantitative Analysis of Characteristics and Relationship between Topsoil Magnetic Susceptibility and Heavy Metals in Main Urban Area of Fuxin City in Liaoning Province |
| |
| Affiliation: | 1.School of Geography, Liaoning Normal University, Dalian 116029, China2.Fuxin Senior High School, Fuxin 123000, China |
| |
| Abstract: | In the topsoil of a few coal resource-based cities, a consensus has emerged that the accumulation of heavy metals is closely related to magnetic susceptibility. However, the quantitative relationship between heavy metal content and magnetic susceptibility in the topsoil remains poorly understood. In order to understand the quantitative relationship between the content of heavy metals such as copper (Cu), zinc (Zn), cadmium (Cd), and mercury (Hg) in the topsoil and the magnetic susceptibility, we took the topsoil (0-20 cm) in the main urban area of Fuxin City as the research object, collected samples, and analyzed the magnetic susceptibility and heavy metal content of the soil samples. On this basis, we used mathematical-statistical, spatial interpolation, correlation, and path analyses to determine the content distribution, spatial distribution, and quantitative relationship between magnetic susceptibility and heavy metal content. The following conclusions can be drawn by this study: (1) The average values of mass susceptibility and frequency susceptibility of the topsoil in Fuxin City were 196.88×10-8 m3/kg and 2.41%, respectively, with a relatively large numerical variation of the susceptibility. The mass susceptibility of the topsoil was mainly concentrated in the center of the main urban area (around the Haizhou strip mine) and the northwest of the main urban area. The area with high frequency susceptibility generally corresponded to the area with low mass susceptibility, and the spatial distribution pattern of frequency susceptibility showed a patchy distribution characteristic. (2) The average contents of Cu, Zn, Cd and Hg were 45.13, 107.96, 0.13, and 0.11 mg/kg, respectively, and the point source enrichment of these heavy metals was distinct. The enrichment of Cu, Zn, Cd was primarily concentrated in the central area of the main urban area with frequent economic activities and the surrounding area of the Haizhou strip mine. The enrichment area of mercury was mainly distributed along the Xihe River in the northeast-southwest direction. (3) The mass magnetic susceptibility of the topsoil in the main urban area was significantly positively correlated with the content of Cu, Zn and Cd. Also, a multiple regression relationship was observed between the mass magnetic susceptibility and the content of zinc and copper. This relationship can be expressed as χlf=-161.122+1.437Zn]+4.729Cu]. The frequency susceptibility had a significant negative correlation with the content of Zn and Cd, and a linear relationship with Cd content χfd=3.720-10.154Cd]. The results showed obvious enrichment of heavy metals in the topsoil of the main urban area of Fuxin City and the accumulation of Cu, Zn and Cd was significantly related to the magnetic susceptibility. The magnetic susceptibility threshold can be obtained by substituting the regional background values of heavy metals into the established functional relationship equation. By comparing the measured magnetic susceptibility with the magnetic susceptibility threshold, the enrichment status of the heavy metals can be quickly predicted. In the monitoring and treatment of urban topsoil environments, it is suitable to use magnetic susceptibility tests and analyses as a simple and quick environmental indicator. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《环境科学研究》浏览原始摘要信息 |
|
点击此处可从《环境科学研究》下载全文 |
|
