Evaluation of cyanide stability in aqueous solutions: effect of pH, aeration, and nutrients
DOI:
https://doi.org/10.33414/rtyc.52.36-47.2025Keywords:
Cyanide stability, Free cyanide, Cyanometallic complexes, CyanohydrinsAbstract
The stability of cyanide in NaOH solution was evaluated as a function of pH, aeration, and nutrient addition. The results indicated that aeration and pH are critical factors for its stability; a significant decrease in cyanide concentration was observed especially at pH 11 with aeration. The addition of nutrients, such as glucose and inorganic salts, influenced the stability, suggesting that chemical reactions related to the formation of cyanohydrins that affect the cyanide concentration could occur. To address this instability, free cyanide was converted into iron complexes, resulting in a significant improvement in solution stability. These findings highlight the potential of cyanometallic complexes as an effective strategy for the safe management of cyanide in environmental applications, contributing to safer practices in its use and treatment.
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Copyright (c) 2025 Elisabet Graciela Robert, María José Pascualone
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