YU Deshun1,2, LIU Shaopu1*, ZHANG Lili3, ZHU Huiwu3, TIAN Yifu2, ZHANG Runyu2, and YANG Jun2
1 College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400716, China,
2 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,
3 College of Chemistry and Material Science, Guizhou Normal University, Guiyang 550001, China
Abstract This paper deals with the influences of pH, acidity and ionic intensity of the solutions on the resonance Rayleigh scattering spectra and fluorescence spectra of humic acid. When the pH value is low and the acidity and ionic intensity are high, the resonance Rayleigh spectra and fluorescence spectra both show a tendency of increasing, though the former’s intensity is much higher. In combination with the transmission electron microscope data, the factors leading to the occurrence and enhancement of the resonance Rayleigh scattering spectra of humic acid were explored. It is considered that particle enlargement caused by aggregation, the increase of heterogeneity, the increase of hydrophobility, the formation of interface, etc., are the factors leading to the occurrence and enhancement of the resonance Rayleigh scattering spectra of humic acid. As the intensity of the resonance Rayleigh scattering spectra of humic acid is much higher, resonance Rayleigh scattering spectroscopy can be used as a newly developed spectrum technology, which is more sensitive and simpler, to study humic acid and its complicated behaviors.
Key words humic acid; resonance Rayleigh; scattering spectra; fluorescence spectra; transmission electron microscopy
* Corresponding author, E-mail: liusp@swu.edu.cn
CHINESE JOURNAL OF GEOCHEMISTRY Vol. 31, No. 1, 2012, page 24-30
© Science Press and Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg 2012
