Characterization of Soil Clay Minerals Using Mid-infrared Spectroscopy
Clay mineral is one of the most important components in soil, and the characterization of soil clay is very useful to study the interactions between soil clay and soil organic materials. Chemical analysis of soil clay is time-consuming, while the infrared spectroscopic method seems promising. In this research, the characterization of three source clay minerals, i. e. illite, kaolin and montmorillonite, were analyzed using three midinfrared spectroscopic techniques (attenuated total reflectance (FTIR-ATR), transmittance spectroscopy, and photoacoustic spectroscopy (FTIR-PAS)). For the FTIR transmittance spectra of the three source clays, there were three main absorption regions: 2600～3800 cm-1, 1300～1800 cm-1, and 500～1200 cm-1, and sharp differences could be found in each region; for the FTIR-ATR spectra of the three source clays, there were absorptions with minor difference in the region of 800～1200 cm-1; for the FTIR-PAS spectra of the three source clays, there were also three similar absorption regions as FTIR transmittance spectra, but more absorptions were found in the FTIR-PAS spectra comparing with FTlR transmittance absorptions. Comprehensively, FTIR-PAS spectroscopy showed more merits in the characterization of soil clays among the three infrared spectroscopic techniques. The FTIR-PAS was applied to charactrize three soil types, and the interactions between soil clay and soil organic materials could be studied using the step-scaning function of FTIR-PAS.
Infrared spectroscopy Kaolin Montmorillonite Illite Photoacouctic spectroscopy
Changwen Du Guiqin Zhou Jing Deng Jianmin Zhou
State Key Laboratory of Soil and Agricultural Sustainability,Institute of Soil Science Chinese Academy of Sciences,Nanjing 210008,China
国际会议
杭州
英文
265-268
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）