TANG Haiming1,2, XIAO Baohua1
(1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract: Humic acid is an important component of soil organic matter and is a key substance in understanding the physical-chemical property of soil organic matter. This paper reviewed the development of titrimetric methods for characterization analysis of soil humic acid, especially, in identification of functional groups of soil humic acid and in measurement of electric properties of soil humic acid, and discussed the application of titrimetric analysis methods in studying interactions of humic acids and metals in soils. We employed titrimetric analyses as an example to quantify acidic function group contents in humic acids from a limestone soil sample and evaluated the complex stability of Ca2+ and different humic acid fractions. By summarizing the new progress in titration analysis method and comparing titration method with others, this paper concluded that the titration analysis method is an important approach and has broad applications in studying the physicochemical property and the evolution rule of soil humic acid.
Key words: soil organic matter; humic acid; characterization; titrimetric analysis method
EARTH AND ENVIRONMENT Vol.45, No.2, Tot No.316, 2017, Page 151-156
