小江河滩表土磁化率与Cu、Cd相关性差异及原因  

The Difference and Reason of the Correlation Between Magnetic Susceptibility and Cu,Cd in the Beach Topsoil of Xiaojiang River

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作  者:罗淘源 苏怀[1] 龙佳 LUO Taoyuan;SU Huai;LONG Jia(Department ofGeography,YunnanNormalUniversity,Kunming 650500,China)

机构地区:[1]云南师范大学地理学部,云南昆明650500

出  处:《环境科学与技术》2024年第2期137-142,共6页Environmental Science & Technology

基  金:云南省科技人才与平台计划(202305AC160086);云南师范大学研究生科研创新基金(YJSJJ23-B147)。

摘  要:磁化率与重金属元素之间的相关性是利用磁化率评估区域重金属污染的前提。文章通过测定东川小江河谷30个河滩表土样品的磁化率与Cu、Cd元素发现,小江河滩表土磁化率(低频)平均值为218.46×10-8m3/kg,频率磁化率百分数为0.87%;Cu、Cd平均含量分别为130.86 mg/kg和0.18 mg/kg。磁化率与Cu、Cd元素含量均在P<0.01级别上呈正相关,但磁化率与Cu的相关性(R=0.624)明显高于Cd(R=0.495)。X射线衍射鉴定和电子显微观察显示河滩表土的主要载磁物质(对表土磁化率值起主要贡献的物质)为粒径10~200μm的多畴磁铁矿。载磁物质的Cu、Cd元素测定结果显示,载磁物质Cu平均含量为420.95 mg/kg,高出所在表土样品平均值3倍以上,而Cd的平均含量为0.16 mg/kg,低于其所在表土样品的平均值。研究结果表明,载磁物质与Cu元素存在着同源(伴生)排放关系,而与Cd元素存在此类关系的概率较低,这可能是小江河滩表土磁化率与Cu相关性高于Cd的主要原因。The correlation between magnetic susceptibility and heavy metal elements is the premise of using magnetic susceptibility to evaluate regional heavy metal pollution.By measuring the magnetic susceptibility and Cu,Cd elements of 30 beach topsoil samples in Xiaojiang River Valley,Dongchuan,it was found that the average value of magnetic susceptibility(low frequency)of the beach topsoil was 218.46×10-8 m3/kg,and the percentage of frequency magnetic susceptibility was 0.87%.The average contents of Cu and Cd were 130.86 mg/kg and 0.18 mg/kg,respectively.The magnetic susceptibility was positively correlated with the content of Cu and Cd at P<0.01 level,but the correlation between magnetic susceptibility and Cu(R=0.624)was significantly higher than that of Cd(R=0.495).X-ray diffraction identification and electron microscopy observation show that the main magnetic material of the surface soil of the river beach(the material that contributes mainly to the magnetic susceptibility of the surface soil)is multi-domain magnetite with a particle size of 10~200μm.The results of Cu and Cd elements in magnetic materials showed that the average content of Cu in magnetic materials was 420.95 mg/kg,which was more than three times higher than the average value of the surface soil samples,the average content of Cd was 0.16 mg/kg,which was lower than the average value of the topsoil samples.The results show that there is a homologous(associated)emission relationship between magnetic materials and Cu,but the probability of such relationship with Cd is low,which may be the main reason why the correlation between magnetic susceptibility and Cu is higher than that of Cd.

关 键 词:磁化率 载磁物质 磁学监测 Cu、Cd元素 

分 类 号:X53[环境科学与工程—环境工程]

 

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