Determination Of Element Content And Infrared Spectra Of Different Types Of Soils In Yunnan Province

Soil is one of the most basic and important environmental factor for biological in ecosystem. It is not only an undertaker of crop production, but also provided a suitable living environment for mankind. So, it is particularly important to study different kind of farmland soils. In this dissertation, inductively coupled plasma mass spectrometry(ICP-MS) and Fourier transform infrared spectra(FTIR) were used to study different types of soil in Yunnan Privince.The contents of major and trace elements of P, K, Ca, Mg, Cu, Fe, Zn, and Mn in farmland soils collected from Yunnan Province were determined by inductively coupled plasma-mass spectrometry(ICP-MS), and the distribution of major and trace elements were also studied. The results showed that the contents of available P and K were balance, available Ca and Mg were deficient, available Cu, Fe, Zn, and Mn were very plentiful. Major and trace elements distribution of different landform areas were obvious differences. The contents of trace elements(Fe、Zn、Mn) of central Yunnan Red Plateau were significantly higher than those of Hengduan Mountains in western Yunnan and those of karst plateau in eastern Yunnan. The contents of available P, K, and Ca gradually declined from west to east, while the content of available Cu rose gradually from west to east.Inductively coupled plasma mass spectrometry(ICP-MS) and Fourier transform infrared spectroscopy(FTIR) were used to study seven different color soils in Yuanmou Earth-Forest Scenic Spot in Yunnan. The ICP—MS results showed that available P, K, Ca, Mg, Cu, Fe, Zn and Mn were found in the soil, and the contents of major and trace elements were different for different color soils. A significantly negative correlation is observed between available P, K, Ca, Mg, Cu, Fe, Zn, Mn and Ca. The FTIR results showed that IR spectra of seven different soil samples were similar. The peaks at 3698,3621,1032,798,779,694, and 470 cm-1 were the main absorption bands. The infrared spectra reveal that the soil type was kaolin. Quartz was the main component of mineral in seven soils, which contained a small amount of phosphates, metal oxides and other components.Fourier transform infrared(FTIR) spectroscopy coupled with chemometrics was used to study 5 types of farmland soils collected from Yunnan Province. The results showed that IR spectra of the samples were similar, and the spectra were mainly composed of the vibrations of silicate and phosphate. Hierarchical cluster analysis(HCA) and principal component analysis(PCA) were performed on the second derivative infrared spectra in the range from 1200 to 700cm-1. Both HCA and PCA provide correct rate of 100%. It is proved that FTIR spectroscopy combined with statistical analysis could be used to discriminate the different types of soils.The results showed that ICP-MS combined with FTIR can provide a simple and reliable method for the component of mineral analysis of different types of soils.