Gultom, Sefri Wahyu Fernando, Jurusan Fisika, FMIPA, Universitas Negeri Meda (Indonesia)
Hafis, Muhamad, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Padang, Padang, Indonesian (Indonesia)
Halim, Muhammad Abdul, Chemical Engineering Department, Faculty of Engineering, Universitas Sumatera Utara (Indonesia)
Harahap, Aura F, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Hardi, Jaya, Chemistry Department, Faculty of Mathematics and Natural Sciences, Tadulako University, Palu (Indonesia)

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