Sensing Techniques on Determination of Chlorine Gas and Free Chlorine in Water. - Nurjahirah Janudin; Noor Azilah Mohd Kasim; Victor Feizal Knight; Norhana Abdul Halim; Siti Aminah Mohd Noor; Keat Khim Ong; Wan Md Zin Wan Yunus; Mohd Nor Faiz Norrrahim; Muhammad Syukri Mohamad Misenan; Mas Amira Idayu Abdul Razak; Muhammad Zamharir Ahmad; Mohd. Hanif Yaacob (J. Sensors, 2022)