Impact of Sodium Dodecyl Sulfate Anionic Micelles on the Complex Equilibria of Divalent Metal Ions with 5-Sulfosalicylic Acid

Q4 Earth and Planetary Sciences

Research Journal of Chemistry and Environment Pub Date : 2024-01-31 DOI:10.25303/283rjce010018

M. Ramanaiah, M. Balakrishna, S. Gouthamsri, Lakshmi M. Sowbhagya, K. Jayarao

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Abstract

The potentiometric measurement was conducted to determine the formation of metal-ligand complex species between 5-sulfosalicylic acid and divalent calcium, magnesium and zinc metal ions. The experiment involved varying concentrations of sodium dodecyl sulphate (0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 percent w/v). The experimental procedure was conducted at a temperature of 303 Kelvin, utilizing sodium chloride (NaCl) to regulate the ionic strength to a value of 0.16 moles per cubic decimeter. The dynamic species of 5-sulfosalicylic acid are LH2- and LH2-. The selection of the best fit for the complex speciation was based on statistical criteria including skewness, χ2, kurtosis and crystallographic R-factor. The formation of the complexes ML2H, ML2H2 and ML3H3 was seen upon as the complexation of metal ions with 5-sulfosalicylic acid. The relationship between electrostatics and the stability of complex species has been demonstrated. Additionally, the dispersion of chemical species in relation to pH and compositional variety has been observed. This study investigates the potential existence of intricate equilibria.

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十二烷基硫酸钠阴离子胶束对二价金属离子与 5-磺基水杨酸络合平衡的影响

电位测定是为了确定 5-磺基水杨酸与二价钙、镁和锌金属离子之间形成的金属配体络合物种类。实验涉及不同浓度的十二烷基硫酸钠（0.0、0.5、1.0、1.5、2.0 和 2.5%w/v）。实验过程在 303 开尔文的温度下进行，利用氯化钠（NaCl）将离子强度调节到每立方分米 0.16 摩尔。5-磺基水杨酸的动态物种为 LH2- 和 LH2-。根据偏度、χ2、峰度和晶体学 R 因子等统计标准，选择了最适合的复合物种类。络合物 ML2H、ML2H2 和 ML3H3 的形成被视为金属离子与 5-磺基水杨酸的络合。研究证明了静电与络合物稳定性之间的关系。此外，还观察到化学物质的分散与 pH 值和成分种类的关系。这项研究调查了复杂平衡的潜在存在。

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