磁铁矿区河流沉积剖面中磁化率与重金属含量相关性分析
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摘要
选择广东省铁帽顶铁矿区下游一河流沉积剖面为研究对象,测定沉积物的磁化率与元素含量并作相关性分析,以考察磁铁矿床周边沉积物磁化率指标对重金属富集程度的指示作用。结果显示,该剖面中低频质量磁化率χlf为0. 87×10-6m~3/kg～184. 93×10-6m~3/kg,频率磁化率χfd为0. 5%～7%。χlf仅与Fe2O3呈现极显著的正相关关系,与其他重金属元素相关性差;χfd与Mn、Pb、Cd及REE均呈正相关;元素Cu、Zn、As等与χlf、χfd的相关性都很差。表明在该种磁化率和重金属元素含量背景值均高的特殊地区,简单地利用磁化率指标指示重金属污染水平需谨慎。
A dowmstream sedimentary profile in Guangdong Tiemaoding mining area was selected as the research objective,the correlation between magnetic susceptibility and heavy metal content in the sediment was studied on magnetic susceptibility indicating the enrichment of heavy metal in the surroundings of the magnetite deposit. The results showed that the low frequency magnetic susceptibility( χlf) ranged from 0. 87 × 10~(-6) m~3/kg to 184. 93 × 10~(-6) m~3/kg,and the frequency magnetic susceptibility( χfd) ranged from 0. 5% to 7%. χlfhad only a significant positive correlation with Fe_2O_3,and was poorly correlated with other heavy metals. Mn,Pb,Cd and REE had significant positive correlations with χfd. Cu,Zn and As had poor correlation with χlfor χfd. Caution is needed when simply using magnetic susceptibility index indicating heavy metal pollution in the special area with high background of magnetic susceptibility and heavy metal content.
A dowmstream sedimentary profile in Guangdong Tiemaoding mining area was selected as the research objective,the correlation between magnetic susceptibility and heavy metal content in the sediment was studied on magnetic susceptibility indicating the enrichment of heavy metal in the surroundings of the magnetite deposit. The results showed that the low frequency magnetic susceptibility( χlf) ranged from 0. 87 × 10~(-6) m~3/kg to 184. 93 × 10~(-6) m~3/kg,and the frequency magnetic susceptibility( χfd) ranged from 0. 5% to 7%. χlfhad only a significant positive correlation with Fe_2O_3,and was poorly correlated with other heavy metals. Mn,Pb,Cd and REE had significant positive correlations with χfd. Cu,Zn and As had poor correlation with χlfor χfd. Caution is needed when simply using magnetic susceptibility index indicating heavy metal pollution in the special area with high background of magnetic susceptibility and heavy metal content.
引文
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[2]师荣光,郑向群,龚琼,等.农产品产地土壤重金属外源污染来源解析及防控策略研究[J].环境监测管理与技术,2017,29(4):9-13.
[3]朱昊,吴春发,陈宜.苏中地区小麦籽粒重金属含量水平及健康风险[J].环境监测管理与技术,2017,29(1):35-38.
[4] OLDFIELD F,SCOULLOS M. Particulate pollution monitoring in the Elefsis Gulf:The role of mineral magnetic studies[J].Marine Pollution Bulletin,1984,15(6):229-231.
[5]方芳,李晓燕.磁化率对土壤重金属污染的指示作用系[J].环境监测管理与技术,2011,23(S1):78-83.
[6] LIU D X,MA J H,SUN Y L,et al. Spatial distribution of soil magnetic susceptibility and correlation with heavy metal pollution in Kaifeng City,China[J]. CATENA,2016,139:53-60.
[7]文昌生,王军.广东大顶铁矿地质特征及其找矿标志[J].资源环境与工程,2015,29(2):164-168.
[8]刘青松,邓成龙.磁化率及其环境意义[J].地球物理学报,2009,52(4):1041-1045.
[9]卢升高.土壤频率磁化率与矿物粒度的关系及其环境意义[J].应用基础与工程科学学报,2000,8(1):9-15.
[10] HAY K L,DEARING J A,BABAN S M,et al. A preliminary attempt to identify atmospherically-derived pollution particles in English topsoils from magnetic susceptibility measurements[J].Physics and Chemistry of the Earth,1997,22(1-2):207-210.
[11]旺罗,刘东生,吕厚远.污染土壤的磁化率特征[J].科学通报,2000,45(10):1091-1094.
[12]付淑清,殷学博,方国祥,等.新丰江上游铁矿区河流沉积剖面微量元素特征[J].安全与环境学报,2013,13(6):123-127.
[13]程志中,谢学锦,潘含江,等.中国南方地区水系沉积物中元素丰度[J].地学前缘,2011,18(5):289-295.
[14]任天祥,伍宗华,羌荣生.区域化探异常筛选与查证的方法技术[M].北京:地质出版社,1998:15-17.
[15]鄢明才,迟清华.中国东部地壳与岩石的化学组成[M].北京:地质出版社,1997:105-135.
[16] SAWYER E W. The influence of source rock type,chemical weathering and sorting on the geochemistry of clastic sediments from the Quetico metasedimentary belt,Superior province,Canada[J]. Chemical Geology,1986(55):77-95.
[17]刘彩彩,邓成龙.南方红土的磁性矿物组成及其区域性差异[J].第四纪研究,2012,32(4):626-634.
[18]吕镔,刘秀铭,王涛,等.花岗岩上发育的亚热带红土岩石磁学特征[J].第四纪研究,2014,34(3):504-515.
[19] JINADASAS K B P N. Adsorption of fluoride on goethite surface implications on dental epidemiology[J]. Environmental Geology,1993,21(4):251-255.
[20]陆雅海,黄昌勇,袁可能,等.砖红壤及其矿物表面对重金属离子的专性吸附研究[J].土壤学报,1995,32(4):370-376.