On the artificial humic acids prepared from coal and microorganism pigments

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Abstract
In order to obtain artificial humic acids comparable to soil humic acids the writers2) had prepared artificial humic acids from various organic compounds or extracted them from numerous humus-like substat'ces of natural sources, and measured their absorption spectra and stabilities to chemical oxidation. Following these experiments, artificial humic acids were prepared from coals and microorganism pigments, and the same experiments as mentioned above were performed. The results are presented in this paper.

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