利用漫反射光谱鉴定红粘土中针铁矿和赤铁矿

被引:37
作者
周玮 [1 ]
季峻峰 [1 ]
Balsam William [2 ]
陈骏 [1 ]
机构
[1] 南京大学地球科学系表生地球化学研究所
[2] Department of Earth and Environmental Sciences University of Texasat Arlington,Arlington,Texas
关键词
漫反射光谱; 针铁矿; 赤铁矿; 加热;
D O I
10.16108/j.issn1006-7493.2007.04.007
中图分类号
P575 [矿物的鉴定及分析];
学科分类号
摘要
针铁矿(Gt)和赤铁矿(Hm)是广泛存在于土壤和沉积物中的重要铁矿物。这两种矿物在土壤和沉积物中含量很低,常规的测试手段很难有效地测定其含量。利用反射光谱联合加热处理的方法,可对土壤及沉积物样品中针铁矿和赤铁矿进行定性或半定量测定。实验结果显示,样品加热到300℃后,针铁矿的反射光谱的一阶导数特征峰发生了变化,赤铁矿的一阶导数特征峰却没有明显的变化。因此加热前后样品反射光谱一阶导数的变化取决于针铁矿和赤铁矿的含量。利用这种方法估计黄土高原第三纪红粘土样品中的赤铁矿含量约为0.3%~0.4%,针铁矿含量约为0.5%~1%。
引用
收藏
页码:730 / 736
页数:7
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