Abstract
Influences of the factors, reaction time, temperature, nitric acid concentration and nitric acid/coal ratio were studied by factorial analysis in relation to the response in the total, hydrolysable and available nitrogen contents of the nitrohumic acids obtained when two Spanish lignites were treated with nitric acid. Correlations between the hydrolysable and the available nitrogen, and the optical properties of the nitrohumic acids have been studied to obtain a more simple and rapid index to determine the available nitrogen of the nitro-lignites.
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