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

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.