Abdullah, mohammad 2022. Spectrophotometric Determination of Fe(II) and Fe(III) Using 5-(4-Ethylphenyl azo ) 2-Hydroxybenzaldehyde Oxime Reagent. Zanco Journal of Pure and Applied Sciences. 33, 6 (Jan. 2022), 21–29. DOI:https://doi.org/10.21271/ZJPAS.33.6.3.