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Updated: Jun 5, 2026

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
Fluorescence spectroscopic investigation of the interaction between triphenyltin and humic acids
Hong-Mei Zhang1, Qiu-Hua Zhou, Mei-Gui Xue
1Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Invironmental Protection, Yancheng City, Jiangsu Province, People's Republic of China. hxzhm@126.com
Abstract:
The interaction between triphenyltin (TPT) and humic acid (HA) was investigated using UV-vis and fluorescence spectra techniques. The experimental results showed that the fluorescence quenching of HA by TPT was a result of the interaction of TPT with HA. The binding constant K(b) and corresponding thermodynamic parameters were measured at different temperatures. The binding of TPT molecule to HA is a spontaneous molecular interaction procedure in which entropy increased and Gibbs free energy decreased. Hydrophobic interaction force plays a major role in stabilizing the TPT-HA complex. The three-dimensional fluorescence contour spectra revealed that TPT could enter into the hydrophobic cavities in some domain of HA.
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