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    Investigation of Electrochemical Behaviour of 3-Allyl-4-Hydroxy-3'-4'- Dimethylazobenzene
    (International Journal of Electrochemical Science, 2013) Menek, Necati; Başaran, Serpil; Karaman, Yeliz; Topçu, Saim
    The reductive voltammetric and polarographic behaviour of the 3-allyl-4-hydroxy-3'-4' dimethylazobenzene at a hanging mercury drop electrode (HMDE) and static mercury drop electrode (SMDE) has been studied in Britton-Robinson (B-R) buffers in the pH range of 2.0-12.0. The 3-allyl-4-hydroxy-3'-4' dimethylazobenzene gave one voltammetric and polarographic peak, corresponding to the reduction of the azo group to hydrazo and amine. The reduction process was found to be dependent on the pH of the supporting electrolyte. The reduction of the azo group to amino group in acidic media and hydrazo step in neutral and basic media was observed. From the observation an electrode reaction mechanism has been suggested for the compound.
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    Investigation of Nickel Ion Release from Stainless Steel Crowns by Square Wave Voltammetry
    (International Journal of Electrochemical Science, 2012) Menek, Necati; Başaran, Serpil; Karaman, Yeliz; Ceylan, Gözlem; Şen Tunç, Emine
    No effort has been made to define nickel magnitude from stainless steel crowns in oral environment. Nickel ions released in sufficient quantities from nickel-containing alloys may induce nickel sensitization or elicit allergic contact dermatitis. In this work nickel ion release from stainless steel crowns in artificial saliva at different days and pH’s has been investigated which is used in pediatric dentistry. Totally 120 stainless steel crowns for primary teeth were immersed to artificial saliva in this study. Nickel in aqueous solutions was determined by square wave voltammetry, using dimethylglyoxime as a complexion agent on mercury electrode. The study revealed that nickel ion release was decreased with increasing pH. Furthermore nickel releasing ratio was decreased in all time periods. Results showed that metal ions released in this experimental condition were well below the critical value to induce allergy and below daily dietary intake level.