Okolo, P. O. and Jideonwo, A. (2003) “PYROGALLOL AS A REAGENT FOR SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM-NITROGEN (NH -N) IN AQUEOUS SOLUTION: ”., Biological Sciences - PJSIR, 46(2), pp. 141–144. Available at: https://v2.pjsir.org/index.php/biological-sciences/article/view/1612 (Accessed: 3 July 2024).