【摘要】 在含番红花红O的磷酸盐缓冲溶液(phosphate buffered salines,PBS)中,采用循环伏安法在预处理过的铅笔芯电极表面生成聚番红花红O薄膜,考察溶液的pH值、扫描电位范围对修饰过程的影响。在-1.0～0.0V(vs SCE)的扫描电位范围和酸性介质中形成的薄膜,在空白PBS中具有较高电活性和稳定性,并且在pH1.5～7.5之间,阳极伏安峰电位与pH值有良好的线性关系。利用这种关系测定橙子和西红柿活体及果汁的酸度取得满意结果。更多还原

【Abstract】 A safranine O(SO) polymer film was formed by cyclic voltammetry on the surface of a pretreated pencil electrode(PGE) in SO-containing phosphate buffered saline(PBS).The effects of buffer pH and potential scan range on the modification process were investigated.The polymer film formed in an acidic solution(pH 6.01) and a potential scan range between-1.0 V and 0.0 V(vs SCE) showed high electrochemical activity and good stability in blank PBS solutions,and a good linearity between the voltammetric peak potential and the buffer pH was obtained in the pH range of 1.5-7.5.This modified electrode could be used for determining the acidity of oranges,tomatoes and juice with satisfying results.更多还原