Due to its polyfunctionality, humic acid, HA, is one of the most powerful chelating agents among the existing natural organic substances: they are able to complex heavy metals [1], inorganic anions and halogens [2], organic acids [3], aromatic compounds [4], pesticides and herbicides [5]. This allows establishing that HA may alter the availability, transport, fixation, and toxicity of environmental contaminants. On the other hand, it is well known that the electrochemical activity of conducting polymers, such as polypirrole (Ppy) is accompanied by the insertion and ejection of anions from the electrolytic solution according to the reaction.
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