S. Jha C. Potentiometric Studies on Chelation of Cu(II), Ni(II), Co(II) and Fe(II) with o-Vanillinsemicarbazone . ajc [Internet]. 2010 Mar. 30 [cited 2024 Aug. 26];8(1):38-41. Available from: https://asianpubs.org/index.php/ajchem/article/view/24015