大气粉尘气溶胶中铁氧化物的光谱分析  

SPECTROSCOPY ANALYSIS OF IRON OXIDE IN MINERAL AEROSOLS

作　　者：沈振兴[1] 张小曳[1] 季峻峰[2] 曹军骥[1] 王亚强[1] 鹿化煜[1] 

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [2]南京大学地球科学系成矿作用国家重点实验室,南京210093

出　　处：《海洋地质与第四纪地质》2003年第1期103-107,共5页Marine Geology & Quaternary Geology

基　　金：国家重点基础发展研究规划项目(G2000048703);中国科学院黄土与第四纪地质国家重点实验室基金资助项目(SKL LQG0213)

摘　　要：首次利用漫反射光谱装置(DRS)对中国大气粉尘气溶胶中铁氧化物进行了研究。结果表明,在可见光范围,粉尘样品反射光谱的一阶导数曲线,在435nm和560nm对样品中的针铁矿和赤铁矿有识别指示意义,样品中铁的含量与赤铁矿和针铁矿的一阶导数峰值相关性良好。同时发现,红、橙、黄3种颜色的反射率随样品中铁含量的增加而增加,而紫、绿、蓝3种颜色的反射率随样品中铁含量的增加而减少,这表明铁氧化物在粉尘气溶胶对可见光的散射和吸收效应中扮演着重要的角色。It is the first time to investigate the composition and the reflectance characteristics of mineral aerosols in China using diffuse reflectance spectrometry (DRS). The result shows the first derivatives of the spectra were referred to signals of ironoxide minerals, hematite and goethite, at 560 and 435 nm. The spectra and peaks were highly correlated to the iron concentrations on the aerosol filters. And reflectivity of the yellow, orange and red bands rose with the increase of iron concentrations while that of the violet, blue and green bands decreased accordingly. We also found that the first derivative values at 560 and 435 nm were strongly related to the iron concentrations in the dust samples, which indicates ironoxide minerals play an important role in the aerosol light scattering and absorbing effects.

关 键 词：大气粉尘气溶胶 铁氧化物 反射光谱 赤铁矿 针铁矿 可见光 

分 类 号：X513[环境科学与工程—环境工程]