Determination of pKa values and copper stability constants of hydrolysed and unhydrolysed compost humic acids using the point-wise method
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ID: 309367
2025
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Abstract
This study investigates Determination of pKa Values and Copper Stability Constants of Hydrolysed and Unhydrolysed Compost Humic Acids Using the Point-Wise Method. The dissociation constants of the functional groups in the humic acids were determined through titration and subsequent calculations of pKa values. The results revealed that hydrolysed CHA exhibited pKa values ranging from 8.60 to 10.22, while unhydrolysed CHA showed pKa values between 9.01 and 10.44, indicating variations in the acidity and binding strength of functional groups due to hydrolysis. The point-wise method was applied to evaluate metal-ligand stability. For hydrolysed CHA, the first stability constant (log K₁) values ranged from 2.50 to 2.90, while the second stability constant (log K₂) varied between 1.04 and 2.07. In contrast, unhydrolysed CHA recorded log K₁ values ranging from 2.14 to 2.65. These findings suggest that hydrolysed CHA possesses stronger and more diverse binding sites for Cu²⁺ complexation compared to unhydrolysed CHA. Overall, the study highlights the significant role of hydrolysis in enhancing the metal-binding capacity of compost-derived humic acids. These results provide useful insights into the application of compost humic acids in environmental remediation, metal sequestration, and soil fertility improvement.
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| Authors | A. A. Bilkisu |
| Journal | Aminu Kano Academic Scholars Association Multidisciplinary Journal |
| Year | 2025 |
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| Keywords | Keywords not found |
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