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Effect of Acid–Base Equilibrium on Absorption Spectra of Humic acid in the Presence of Copper Ions

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The reaction between humic acid (HA, sample IHSS) and a metal ion (Cu2+) that was manifested as absorption bands in the range 210–350 nm was recorded using absorption spectroscopy. The reaction was found to be more effective as the pH increased. These data were interpreted in the framework of generally accepted concepts about the influence of acid–base equilibrium on the dissociation of salts, according to which increasing the solution pH increases the concentration of HA anions. It was suggested that [HA–Cu2+] complexes formed.

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Authors and Affiliations

  1. V. V. Voyevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, 3 Institutskaya Str., Novosibirsk, 630090, Russia

    N. L. Lavrik & N. U. Mulloev

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  1. N. L. Lavrik
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  2. N. U. Mulloev
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Correspondence to N. L. Lavrik.

Additional information

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 81, No. 1, pp. 159–161, January–February, 2014.

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Lavrik, N.L., Mulloev, N.U. Effect of Acid–Base Equilibrium on Absorption Spectra of Humic acid in the Presence of Copper Ions. J Appl Spectrosc 81, 158–160 (2014). https://doi.org/10.1007/s10812-014-9902-0

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  • DOI: https://doi.org/10.1007/s10812-014-9902-0

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