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Carboxylic Content of Humic Acid Determined by Modeling, Calcium Acetate, and Precipitation Methods

Dep. of Renewable Resources, Univ. of Louisiana, Lafayette, LA 70504

Chan Won Park

National Inst. of Agric. Sci. & Technology, 249 Seodun-dong, Suwon, Korea

Jeong-Gyu Kim^* and Soo Kil Lim

Div. of Environ. Sci. and Ecological Eng., College of Life and Environ. Sciences, Korea Univ., 1,5-Ka, Anam-dong, Sungbuk-ku, Seoul, Korea

View larger version (12K): [in this window] [in a new window]   Fig. 1. Comparison of charge development curves in batch downward, batch upward, and continuous titration for Namwon humic acid with a 0.1 M NaNO3 ionic background.

View larger version (22K): [in this window] [in a new window]   Fig. 2. Proton affinity curves for humic acids (HA): plots of the observed and fitted charge vs. pH using Model A.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Proton affinity curves for humic acids (HA): plots of the observed and fitted charge vs. pH using Model V.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Solubility curves of humic acids (HA) in the presence of different amount of cetyltrimethylammonium (CTA+) at pH 7.0.