共查询到19条相似文献,搜索用时 93 毫秒
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介绍了氧化还原滴定误差公式的推导方法。该误差公式分别用终点组分浓度及终点电位表示,适用于任意电对间的氧化还原滴定。 相似文献
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陈养民 《渭南师范学院学报》1991,(Z1)
在氧化还原滴定分析法中,对于参加反应的氧化剂和还原剂相应电对的标准电位的大小与氧化还原滴定曲线电位突跃范围的大小及滴定误差、反应中两电对半电池电子转移数目之间的定量关系,未曾见到定量的描述公式。本文对以对称电对参加的氧化还原滴定体系进行讨论,推导出了它们之间的定量公式。并进行了氧化还原滴定分析可行和性滴定曲线电位突跃范围大小的定性定量描述,且应用于计算滴定曲线电位突跃范围。均得到了满意的结论。 相似文献
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在被滴物浓度不太低的情况下,讨论了氧化还原滴定过程中,由于指示剂变色电位与化学计量点电位不符而引起的误差,并建立了一种计算方法. 相似文献
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本文将小波变换技术应用于电位曲线的处理,建立了测定酱油中氯化钠含量的方法。 相似文献
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A series of experiments was conducted to examine the phenomenon of potentiation. Experiment 1 demonstrated potentiation of odor aversions by taste when morphine served as the unconditioned stimulus (US). Experiment 2 provided evidence that the observed potentiation was due to a within-event association between odor and taste stimuli, rather than reflecting an enhanced odor-morphine association. In Experiment 3, morphine supported place conditioning to contextual cues and aversive conditioning to a taste cue, but potentiation of place conditioning by a taste cue was not obtained. Apparently the absence of potentiation was due to the dual nature of the morphine US, as potentiation of a contextual aversion by taste was obtained in Experiment 4 when a strictly aversive US (lithium) was used. These data suggest that potentiation depends on (1) an initially weak association between the to-be-potentiated conditioned stimulus (CS) element and the US, and (2) the elicitation of qualitatively similar responses by the individual elements of the CS compound. Collectively, these results support an explanation of potentiation based on within-event learning. 相似文献
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络合性滴定中 ,滴定准确性很大程度上受酸度控制的影响 ,尤其是选择性络合滴定 ,本文就国内一些分析化学教科书中选择性滴定的酸度控制的问题进行探讨 ,较为全面、系统的分析了酸度控制原理 相似文献
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谢鹏 《广东轻工职业技术学院学报》2012,(3):42-44,48
目的:改进酸标准溶液标定方法。方法:在用GB601—2002方法配制时,尝试用三羟甲基氨基甲烷(THAM)作基准物,采用MATLAB小波工具箱函数确定滴定终点(化学计量点)并计算标准溶液浓度。结果:THAM作基准物可行,且电位滴定——小波变换法用于标定终点检测,其所得结果与手工滴定结果经统计分析,有95%的把握认为两种方法所得结果无显著差异。结论:电位滴定——小波变换法确定终点比手工指示剂法准确、简单、方便。 相似文献
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建立和讨论分析化学中的四大类滴定曲线是化学分析原理的核心内容,传统都是通过溶液中的平衡原理分四个阶段讨论并手工绘制滴定曲线。武汉大学主编的《分析化学》(第四版)中对滴定曲线三段一点式的模式进行改革,代之滴定曲线方程,以利于使用计算机编程给出完整的滴定曲线。利用Mathematica6.0编程来统一处理四大类滴定曲线,具有简便、快速和绘制的曲线清晰等优点。 相似文献
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对3种传统测钙方法(酸碱滴定法、络合滴定法、氧化还原滴定法)的准确度进行了比较研究,结果表明:采用络合滴定法测定Ca,准确度高,耗时短,且方法简便易行,更适合用于教学实验和常量钙的快速测定. 相似文献
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结合滴定曲线,系统揭示了多元酸碱滴定条件的本质、意义和关系.研究表明:Ki/Ki+1既是分步滴定的决定性因素,也是影响滴定突跃的首要指标;cspiKi是当Ki/Ki+1足够大时,决定突跃大小的关键所在.滴定前的判定程序是:先看被测物的Ki/Ki+1是否大于或等于10^5,以确定能否分步滴定;再看cspiKi是否大于或等于10^-9,以确定现有条件下能否直接准确滴定. 相似文献
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Batsell WR Wakefield E Ulrey LA Reimink K Rowe SL Dexheimer S 《Learning & behavior》2012,40(2):180-194
The present series of five flavor aversion experiments with rat subjects examined compound conditioning at varying CS-US intervals. Using a taste-taste design, Experiments 1A and 1B demonstrated overshadowing at a 0-min CS-US interval and potentiation at a 120-min CS-US interval, and these effects occurred with both tastes of the compound. Experiment 2 showed that the aversion to a single element is reduced when the CS-US interval is increased to 120 min, but the aversion for a compound taste is not. Experiments 3A and 3B explored odor + taste compound conditioning; the results demonstrated odor potentiation across the trace interval and a transition from taste overshadowing to taste potentiation. Collectively, the data show that the change from overshadowing to potentiation was not due to changes in the aversions produced by compound conditioning but, instead, was due to a more rapid loss of conditionability across a trace interval prior to the US in single-element conditioning. These experiments suggest that following compound conditioning, the aversion to each element represents generalization decrement from the configured compound, but the designation of overshadowing or potentiation actually depends on the status of conditioning in the single-element control. 相似文献