三聚氰胺和Vc对BSF体系pH振荡的影响

采用自制的连续流动进样装置研究了三聚氰胺和Vc对BrO3--SO32--Fe(CN)64--H+(简称BSF)体系振荡行为的影响。结果表明,在30℃、进样流速为1.21 mL/min时,BSF体系的振幅可达4.1个pH单位(pH=3.1⁷.2),平均周期18 min;一定浓度三聚氰胺的加入会增大振荡周期,浓度过大会完全抑制振荡;一定浓度的Vc的加入会减小振荡周期,浓度过大会完全抑制振荡。该研究表明,BSF体系pH振荡的行为可通过外源物的加入来改变,该pH振荡对外源物浓度的依赖性使其有望用于物质检测方面。

Effects of melamine and vitamin C on pH oscillation of BSF system

The effects of melamine and vitamin C （Vc） on oscillating behavior of BrO3- -SO32- -Fe （CN）64 -H ＋ （BSF） system through the self-designed continuous flow sampling device. The results showed that the BSF system can oscillate as the flow rate of 1.21 mL/min, with the amplitude of 4.1 pH units and pe riod of 18 min ; the introduction of melamine with a certain concentration will increase the oscillating peri od of BSF, and the oscillation could be inhibit thoroughly if the concentration is large enough ; on the con trary,the introduction of Vc with a certain concentration will decrease the oscillating period, and the os cillation could be inhibit thoroughly if the concentration is large enough. This research showed that the pH oscillation behavior of BSF system can be changed by the addition of exogenous substances, and this pH oscillation system can be expected to be used in material measurement as its dependence on the concen tration of exogenous substances.