Characterization of humic acids extracted from the sediments of the various rivers and lakes in China.

The humic acids (HAs) isolated from the sediments of the various rivers, lakes, and reservoirs in China were studied using elemental analyzer, fourier transform infrared (FT-IR), and CP/MAS 13C nuclear magnetic resonance (NMR) spectroscopy. The results showed that the HAs were characterized by some common chemical and physicochemical properties, but they… CONTINUE READING