Studi Kompleks Assosiasi Pb(II) Menggunakan KI dan Methylene Blue

Research has been carried out on the study of the Pb(II) association complex using KI and methylene blue . This study aims to find the optimum conditions for the Pb(II) association complex such as optimum time, Iodidae concentration, pH, and methylene blue concentration. The measurement methods used are UV-Vis spectrophotometry and AAS (Atomic Absorption Spectrophotometer). Pb(II) is reacted with excess Iodidae to form an anion complex (PbI 4 2- ). The anion complex formed is then reacted with a methylene blue (MB + ) cation complex to form an association complex [MB] 2 [PbI 4 ]. From the results of the study, it was found that the optimum conditions for the formation of anion complexes (PbI 4 2-) at 2 hours, a concentration of 0.4 M with an absorbance of 0.1069 A at anion wavelength of 266 nm. While the optimum conditions for the association complex [MB] 2 [PbI 4 ] occurred at a wavelength of 665 nm with an absorbance of 0.6119 A, pH 3 with an absorbance of 0.9675 A and a concentration of 0.0012 % methylene blue with an absorbance of 0.1266 A. The association complex The resulting product was contacted with Pb(NO 3 ) 2 at a concentration of 0.01 ppm and was successfully concentrated by obtaining a concentration of 0.6387 ppm and an absorbance value of 0.0092 A. So that a concentration factor of 63.87 times was obtained.