Rodríguez Espinoza, R. , Jamanca Gonzáles, N. , Gomero Mancesidor, J. , Castro Bartolomé, H. and Celis Rojas, S. 2018. Evaluation of free and residual chlorine in drinking water of the district of Pativilca - Barranca. Journal of Sciences and Engineering. 2, 1 (Dec. 2018), 16–20.