“Separate Sorption-Spectroscopic Determination of Pb(II), Mn(II), Co(II), Ni(II), Cd(II), Cu(II), Zn(II) in Their Mixture Using the Reagent Indicator Paper”. V. N. Karazin Kharkiv National University Bulletin. Chemical series, no. 22 (December 20, 2013): 210–219. Accessed October 25, 2026. https://periodicals.karazin.ua/chemistry/article/view/14440.