%0 Conference Proceedings %T Potentiometric study of 2, 2´ bipyridine-citric acid proton-transfer system and itscomplexation with VO2+ ion in aqueous solution %A Ardeshir Shokrollahi %A Ameneh Alizadeh %A Somaye Sharifi %A Zahra Malekhossieni %A Mirzaei Shahrabi, Masoud %J سیزدهمین کنفرانس شیمی معدنی %D 2011