【摘 要】
:
The reaction between iodate and thiourea has been studied in an unbuffered acidic medium. In excess iodate the reaction shows not only oligooscillations in pH,
【机 构】
:
Department of Chemistry and Material Science,College of Chemical Engineering
论文部分内容阅读
The reaction between iodate and thiourea has been studied in an unbuffered acidic medium. In excess iodate the reaction shows not only oligooscillations in pH, Pt potential and the concentration of iodide ion, [I-], but also an initial induction period which has the linear relation with initial pH. At the end of the induction period, [I-] decreases sharply and a yellow coloration (due to iodine) appears transiently. While in excess thiourea iodine is produced and finally consumed, leaving milky deposits (due to sulfur) at the end of the reaction. The induction period from the start of the reaction to the maximum of [I2] is also directly proportional to initial pH. A 14-step mechanism, including a H+-mediated preequalibrium, Dusman reaction, iodine-sulfur reactions and sulfur-sulfur reactions, is proposed. Computer simulations using this mechanism give good agreement with experiments.
其他文献
从耕作技术、水利兴修和农田灌溉3方面介绍了金代农业科学的成就,为人们了解金代农业生产方式提供参考.
合理选址是提高大中型水电工程抗震能力的重要基础,在选址和枢纽布置过程中,应坚持"先避让,后处理,再防护"的原则,主要建筑物不宜建在已知的活动断层上,并应尽量远离活动断裂
患者,男,34岁。有吸毒史6年,在强制戒毒期自行吞食钢针7枚,并刺入左侧眼眶1枚,被发现后送入当地县医院,行颈部X线正侧位片报告示:颈6、颈7平面多枚钢针,有1枚尖端到达颈6椎体
运用微分理论对刻线密度为1200 lp/mm的紫外刻划光栅母版及其二代复制版的衍射特性做了模拟,指出了二者之间存在的差异,并与测试结果做了对照。数值模拟表明,紫外刻划光栅二
在pH=5.0的醋酸-醋酸钠缓冲溶液中,铽与环丙沙星反应形成1:2的稳定络合物,其最佳激发、发射波长分别为λex=330 nm、λem=545 nm.在该反应体系中加入适量叶酸溶液,铽与环
提出了基于稳定性准则的半周期延迟-非线性反馈控制混沌的方法,即SC(stability criterion)半周期延迟非线性反馈控制法.通过对混沌系统的适当分离,得到一个特殊的非线性函数,
系统地研究了溶剂、温度和聚合电流密度对电化学制备本征导电聚吡咯(PPy)膜密度的影响,分别用四探针法和热失重(TG)法研究了不同密度的PPy膜的电导率和热稳定性.用循环伏安法
采用基于密度泛函理论(DFT)的总体能量平面波超软赝势法,对Mg,Zn,Cd掺杂InN的32原子超原胞体系进行了几何结构优化,从理论上给出了掺杂和非掺杂体系的晶体结构参数,其中非掺
计算了MgO∶LiNbO3中超短中红外光参量放大(OPA)过程中晶体的相位匹配角与非共线角的优化选择。结果表明,对于800nm波长的抽运光,信号光波长为1053nm时,非共线角α优化在1.74
A CW seeded femtosecond optical parametric amplifier, a compromise between OPG/OPA and strongly seeded OPA configurations, has been demonstrated. An independent