Galal M. Elmanfe, Suad K. Omar , Ahmad B. Eznien. (2020). Determination of Nicotine in Libyan Smokers and Nonsmokers’ Urine samples by Ultraviolet-Visible Spectrophotometry . Journal of Pure & Applied Sciences , 19(5), 126-131. https://doi.org/10.51984/jopas.v19i5.826