Yang Meng, Li Hui-Ming, Li Feng-Ying, Wang Jin-Hua, Diao Yi-Wei, Qian Xin, Yang Zhao-Ping, Wang Cheng
Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Huan Jing Ke Xue. 2017 Dec 8;38(12):5282-5291. doi: 10.13227/j.hjkx.201704197.
The use of mineral magnetic measurements as a potential pollution proxy is explored as an alternative means of monitoring heavy metal pollution in playground dust in industrial areas. Dust samples were collected from playgrounds in an industrial area in Nanjing. The magnetic properties of the samples were analyzed, and the total and acid-extractable concentrations of heavy metals were measured.Mineral magnetic concentration parameters[mean magnetic susceptibility () 939.31×10 m·kg and saturation isothermal remanent magnetization (SIRM) 16618.74×10 A·m·kg] indicate that the dust samples contain high concentrations of magnetic minerals when compared to the non-industrial zone of the city. High and stable S-ratio values (mean 0.97, standard deviation 0.01) indicate the prominence of ferromagnetic minerals. Low values of anhysteretic remanent magnetization ()/(2.35) and /SIRM (0.12×10 m·A) indicate predominantly coarse pseudo single domain (PSD) and multi-domain (MD) magnetic grain size assemblages. The playground dust is considered moderately to highly polluted, and the enrichment factor values for Cd, Zn, Cu, and Pb indicate extremely high contamination levels in the playground dust. Mineral magnetic parameters[, SIRM, hard isothermal remanent magnetization (HIRM), , and /SIRM] reveal significant correlations with total and acid-extractable concentrations of the trace metals, and the correlations with total concentrations are stronger. The most significant correlations were found with mineral magnetic concentrations ( and SIRM) and total concentrations of the elements Mn, Ni, and Cr and the Tomlinson pollution load index (PLI) (0.69 ≤ ≤ 0.86, <0.01). Consistent spatial characteristics between them were also found, showing that the total concentrations of heavy metals and magnetic parameter values are higher in the playgrounds near and downwind of the power plant. Results of a principal component analysis indicate that anthropogenic activities (mainly from coal consumption by power plants) are the main sources for both heavy metals and magnetic minerals. In summary, significant correlations and consistent spatial characteristics between heavy metal contents and magnetic parameters and the same anthropogenic source for heavy metals and magnetic minerals confirm that magnetic parameters could be considered as efficient indicators for heavy metal contamination in the playground dust in industrial areas.
探讨了利用矿物磁性测量作为潜在污染指标，作为监测工业区操场灰尘中重金属污染的一种替代方法。从南京某工业区的操场采集了灰尘样本。分析了样本的磁性特性，并测量了重金属的总量和酸可提取浓度。矿物磁性浓度参数[平均磁化率（）939.31×10 m·kg和饱和等温剩磁（SIRM）16618.74×10 A·m·kg]表明，与城市非工业区相比，灰尘样本中含有高浓度的磁性矿物。高且稳定的S比率值（平均0.97，标准差0.01）表明铁磁性矿物的突出。低的非滞后剩磁（）/（2.35）和/SIRM（0.12×10 m·A）值表明主要是粗的准单畴（PSD）和多畴（MD）磁性粒度组合。操场灰尘被认为是中度至高度污染，Cd、Zn、Cu和Pb的富集因子值表明操场灰尘中的污染水平极高。矿物磁性参数[、SIRM、硬等温剩磁（HIRM）、和/SIRM]与痕量金属的总量和酸可提取浓度显示出显著的相关性，与总量的相关性更强。与矿物磁性浓度（和SIRM）以及元素Mn、Ni和Cr的总量和汤姆林森污染负荷指数（PLI）之间发现了最显著的相关性（0.69≤≤0.86，<0.01）。它们之间还发现了一致的空间特征，表明发电厂附近和下风方向的操场中重金属总量和磁性参数值较高。主成分分析结果表明，人为活动（主要来自发电厂的煤炭消耗）是重金属和磁性矿物的主要来源。总之，重金属含量与磁性参数之间显著的相关性和一致的空间特征以及重金属和磁性矿物相同的人为来源证实，磁性参数可被视为工业区操场灰尘中重金属污染的有效指标。
