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Nasution, Zuhairiah, Jurusan Kimia, Universitas Negeri Medan (Indonesia)
Natasya, Titania, Pendidikan IPA, FMIPA Universitas Negeri Medan (Indonesia)
Nilmarito, Suriati, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Ningsih, Rima Oktavia, Chemistry Department, Faculty of Mathematics and Natural Sciences, Lambung Mangkurat University, Jl. A. Yani Km. 36 Banjarbaru 70714 Kalimantan Selatan (Indonesia)
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