Raman Spectra of Humic Substances Adsorbed on Silver Powders

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Abstract
A simple chemical - reduced method and then a modified rinse procedure were used to prepare finely divided silver powder without Raman background. When small amount of humic samples were diluted in a large excess of the silver powder and the mixtures were prepared as compacted discs, the Raman scattering signals of many humic samples could be reliably measured while the problems in the conventional Raman measurements of humic substances such as strong fluorescence and self - adsorption of the Raman scattered radiation were solved. The results revealed the graphite-like structures of the humic samples.

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