Ginting, Therecia Fricillia, Chemistry Department, Faculty of Mathematics and Natural Science, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Girsang, Sedianta, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of medan, Jl. Williem Iskandar Pasar V Medan Estate, Medan 20221, Indonesia (Indonesia)
Girsang, Thomson A.S, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan (Indonesia)
Girsang, Thomson A.S., Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan
Gulo, Asnad, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)

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