we have extracted the fulvic acid (FA)and humic acid (HA) from river soil sediments. after FTIR analysis we also got functional droups for FA and HA. Now, may anyone suggests me that which method is suitable to determine the concentration of that functional groups?
Thanks
Dear Sir. Concerning your issue about the titration method that is suitable to determine the concentration of functional group in soil organic matter . A direct potentiometric titration method was applied to commercial and soil humic acids in order to determine their carboxyl and phenol group concentrations and apparent and intrinsic pK. In that context, acid-base properties of humic acids are interpreted by selective blocking of carboxylic and phenolic groups by esterification and acetylation. Differences in underivatized and derivatized HA's acid-base properties are ascribed to carboxyl and phenol groups influence on total humic acidity. Potentiometric data were treated with the modified Henderson-Hasselbalch equation. Infra red results, the acidic group contents and the average values of apparent and intrinsic pK for underivatized and derivatized HAs confirmed the selectivity of esterification derivatization method. After blocking of the functional groups, the values of acidic group contents decreased, while the value of apparent pK increased after derivatization. Phenol groups cannot be specifically identified by the acetylation method, due to low selectivity of the acetylation method. I think the following below link may help you in your analysis:
http://www.scielo.br/pdf/eq/v31n3/05.pdf
Thanks
Dear Jawal Ali,
you may also check the Boehm titration:
H.‐P., B., E., D., W., H., R., S., 1964. Surface Oxides of Carbon. Angew. Chemie Int. Ed. English 3, 669–677. https://doi.org/10.1002/anie.196406691
Boehm, H.P., 1994. Some aspects of the surface chemistry of carbon blacks and other carbons. Carbon N. Y. 32, 759–769. https://doi.org/10.1016/0008-6223(94)90031-0
Boehm, H.P., 2002. Surface oxides on carbon and their analysis: a critical assessment. Carbon N. Y. 40, 145–149. https://doi.org/10.1016/s0008-6223(01)00165-8
Best regards
Nils
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