A Kinetic-Equilibrium Study of a Triiodide Concentration Maximum Formed by the Persulfate-Iodide Reaction
A Kinetic-Equilibrium Study of a Triiodide Concentration Maximum Formed by the Persulfate-Iodide Reaction
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DOI：
10.1021/ed200055t
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发表时间：
2012-06-01
影响因子：
3
通讯作者：
Davidson, John C.
中科院分区：
文献类型：
--
作者：
Burgess, Arthur E.;Davidson, John C.
在过硫酸盐-碘化物与过量过硫酸盐反应的整个寿命期间，三碘化物I-3（-）的存在受到碘化物浓度下降和碘浓度上升的相反效应的控制。这使三碘化物达到浓度最大值[I-3（-）]（max），可通过紫外-可见光谱法使用在延长的碘时钟时间扫描上进行的吸光度测量来研究。平衡方程和守恒方程可以结合起来，这样，与[I-3（-）]（max）一起，可以获得在碘、碘化物和三碘化物络合离子之间建立的平衡的常数K的值。
The presence of triiodide, I-3(-), throughout the lifetime of a persulfate-iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I-3(-)](max), which can be studied by UV-visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I-3(-)](max), a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.