SEARCH Articles Figures Tables Acid halides infrared spectroscopy Aqueous solution infrared spectroscopy amino acids Fatty acids infrared spectroscopy Fourier transform infrared spectroscopy acid zeolites Fulvic acids Fourier transform-infrared spectroscopy Infrared spectroscopy acid anhydrides Infrared spectroscopy acid chlorides Infrared spectroscopy acid site concentration Infrared spectroscopy carboxylic acid derivatives Infrared spectroscopy carboxylic acids Infrared spectroscopy carboxylic acids and derivatives Infrared spectroscopy stearic acid Surface acidity infrared spectroscopy