Samosir, Rafidah Almira, Department of Chemistry , Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Samosir, Rafidah Almira, Department of Chemistry, Faculty Of Mathematic and Natural Sciences, State University Of Medan (Indonesia)
Samosir, Rafidah almir, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Samosir, Rafidah Almira, Department of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan, Medan (Indonesia)
Samosir, Rafidah, Departmen of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan (Indonesia)

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