1. Department of Chemistry, Faculty of Science, Karadeniz Technical University, Trabzon, Turkey,
2. Espiye Vocational School, Giresun University, Espiye, Giresun, Turkey,
3. Şebinkarahisar Technical Sciences Vocational School, Giresun University, Giresun, Turkey, and
4. Maçka Vocational School, Karadeniz Technical University, Maçka, Trabzon, Turkey