摘要
利用沉积物的磁学特征提取环境信息,进行污染评价是环境磁学的研究领域之一,本文对福州河道表层沉积物50个样品进行环境磁学和重金属元素分析,探讨福州河道沉积物磁学特征及其环境意义。结果表明:福州河道表层沉积物以亚铁磁性矿物为主,也含有一定的反铁磁性矿物,磁性矿物颗粒较粗,以多畴和假单畴颗粒为主;重金属与磁学参数相关性分析发现污染轻的沉积物重金属与χ、SIRM相关性较差,与χ_(ARM)、χ_(ARM)/χ、SIRM/χ相关性较好,污染重的沉积物重金属与χ、SIRM相关性较好,与χ_(ARM)、χ_(ARM)/χ、SIRM/χ相关性较差,表明沉积物在清洁状态下重金属易于与细颗粒磁性矿物共存,在重金属含量达到一定阈值时与磁化率相关性较好,与磁畴参数相关性则出现紊乱。因而,磁化率能够明确指示接近中度以及中度以上的重金属污染状况,而对相对较轻的污染状况指示不灵敏。
Monitoring and assessing environment pollution by magnetic method has been one of the most important research areas of environmental magnetism. 50 samples of fiver sediment in Fuzhou have been collected as researching objects of magnetic property and heavy metals measure. The results indicated that： the primary magnetic minerals of fiver sediments in Fuzhou were identified to be ferromagnetic mineral, even hematite was found in some samples. The magnetic domain size of the fiver sediment in Fuzhou is multi-domain and single-domain particles, but stability single domain particles also could be found in some samples. The correlation analysis between heavy metals and magnetic parameters show that concentration of heavy metals in clean sediments have poor correlation with χ and SIRM, and good correlation with χARM, χARM/χ, SIRM/χ. While concentration of heavy metals in contaminated sediments have good correlation with χ and SIRM, and poor correlation with χARM, χARM/χ, SIRM/χ SO we could infer that heavy metals were more easily coexist with fine particles, but when concentration of heavy metals reaches to a certain threshold which would show poor correlation with magnetic domain size, and good correlation with concentration of magnetic mineral.
出处
《地球环境学报》
2015年第1期17-25,共9页
Journal of Earth Environment
基金
福建省科技计划项目公益类项目(K3-296)
福建省自然科学基金项目(2014J01151)
大学生创新创业训练计划创新训练项目(cxxl-2014097)
关键词
河道沉积物
环境磁学
重金属
闽江
福州市
river sediments
environmental magnetism
heavy metals
Minjiang River
Fuzhou City
