Abstract
Five fulvic acid samples were characterized by elemental analyses, the ratio of optical density at 465 nm and 665 nm (E 4 /E 6 ), gel‐permeation chromatography, Fourier transform infrared spectroscopy (FT‐IR), and 1H and I3C nuclear magnetic resonance spectroscopy ('H‐NMR and 13C‐NMR). Out of these fulvic acids, two were extracted from Kaschin‐Beck disease prone areas drinking water, and three from disease free sources like water, soil and peat. The physical and chemical properties varied with the sources of fulvic acids but no distinct relation to Kaschin‐Beck disease has been found.
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