KONDISI PEMBENTUKAN KOMPLEKS ION LOGAM KALSIUM DAN MAGNESIUM DENGAN OKSIN SEBAGAI PENGOMPLEKS

Abstract

8-Hydroxyquinoline or oxine is a complexing agent which can form complexes with all metal ions in the nonpolar state. Because of the ability of oxine to form metal-oxinate complexes, it is difficult to perform  qualitative and quantitative analysis if one sample contains many metal ions. The purpose of this study is to obtain the optimum conditions for the formation of compounds of Ca-Oxinic and Mg-Oxinic complexes. The reaction between Ca^{2 +} and Mg²⁺ ions forms a yellow chelate complex. The results of the study showed that the Ca-Oxinic complex compound gave maximum absorbance at a wavelength of 450 nm. The optimum concentration of Ca-oxynat complex formation was 15 ppm with optimum pH of Ca²⁺ 4 ion with stirring time for 20 minutes and achieving stability of complex formation in 45 minutes minutes. While the compound Mg-Oxinat complex provides maximum absorbance at a wavelength of 455 nm. The optimum concentration of the formation of Mg-oxinate complex was 20 ppm with the optimum pH of Mg²⁺ 4 ions with stirring time for 20 minutes and achieved the stability of complex formation in 40 minutes minutes.