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The order of biodegradability of the sulfated and sulfited fatliquor substances in water is castor oil > fish oil > rape oil > mineral oil. In degradation kinetics studies the degradation rate constant (k) of sulphated castor oil, fish oil and rape oil are 0.87, 0.84, and 0.81 d-1, respectively. These degradation rate constants are slightly faster for the sulfited fatliquor substances where castor, fish and rape were 0.95, 0.93, and 0.85 d-1, respectively.). The higher content of unsaturated fatty acids and hydroxyl groups, the faster is the biodegradability of fatliquors. The very high level biodegradablity of the sulfated fat liquors was also documented in a 1976 study of the sodium salt of sulfated castor oil (96% in 45 days).