[1] Sinop Univ, Dept Math & Sci Educ, TR-57000 Sinop, Turkey
[2] Sinop Univ, Environm Hlth Programme, Sinop, Turkey
[3] Ondokuz Mayis Univ, Dept Chem, Samsun, Turkey
[4] Pamukkale Univ, Chem Technol Program, Denizli, Turkey
[5] Ondokuz Mayis Univ, Dept Phys, Samsun, Turkey