沉淀分离-连续滴定法测定电解液中氟硅酸和铅

在电解液中加入硫酸钾,使氟硅酸和铅生成沉淀与其它元素分离,再将沉淀转化为可滴定的溶液,用氢氧化钠标准滴定溶液滴定氟硅酸后,再用EDTA标准滴定溶液滴定铅.沉淀分离-连续滴定的方法准确、快速,满足生产分析要求.     

三氯化钛还原-重铬酸钾滴定法测定球团矿中TFe

采用碱混合熔剂熔融试样,熔融物以热水浸取盐酸酸化后,用SnCl2-TiCl3将Fe3+还原为Fe2+,以钨酸钠为指示剂指示还原终点;在硫磷混酸介质中,以二苯胺磺酸钠为指示剂,用重铬酸钾标准溶液滴定球团矿中TFe含量。该法测定TFe的绝对误差<0.15%,避免了用重铬酸钾氧化褪去钨蓝色泽时易引入的误差。     

化学法与荧光光谱法测萤石粉中氟化钙含量的讨论

通过化学EDTA容量法与荧光光谱法测量萤石粉中氟化钙含量方法的比较,制定了荧光光谱分析的工作曲线及仪器的最佳工作条件,消除干扰影响,得出荧光光谱法优于传统化学法的结论,满足生产的需要。     

Insights into corrosion in dye solar cells

The main issue in using low cost metals in dye solar cells is the corrosion caused by the liquid electrolyte. Contrary to typical applications of metals, the adverse effects of corrosion in dye solar cells are related to irreversible depletion of charge carriers from the electrolyte rather than consumption of the metal itself. It is calculated that the penetration rate due to corrosion should not exceed 10⁻⁴ mpy (a couple of nanometers per year) to ensure device lifetime longer than 1 year. This is 10 000 times slower rate than what is considered to be a general benchmark value for very low corrosion rate in the field of corrosion science and has a major effect on how corrosion should be investigated in the case of dye solar cells. Different methods, their applicability, and limitations to investigate corrosion in dye solar cells are evaluated here. The issue with most techniques is that they can detect metals that are clearly corroding, but they have significant limitations in proving a metal stable. Our investigation shows that the most reliable information on corrosion is obtained from complete dye solar cells that are exposed to working conditions. A combination of color analysis of the electrolyte to such measurement is proposed as a means to extrapolate future performance of the cells and estimate potential lifetimes of the dye solar cells in regards to corrosion. Copyright © 2014 John Wiley & Sons, Ltd.     

浅谈分析化学课程的教学设计——以“酸碱滴定法”教学实践为例

摘以酸碱滴定法为例,浅谈在分析化学课程教学的各个环节,通过合理设计教学过程,更新教学内容、改革教学方式,充分发挥学生的主体作用,调动学生的思维,提高学生学习的主动性和解决问题的能力,培养学生的创新意识和创新能力。     

自动电位滴定仪测定防锈油的酸值

防锈油中酸性物质含量的控制有着重要的意义。通过研究电位滴定法测定酸值的原理和滴定过程中各项参数对测试结果的影响,最终确定并建立一组适用于防锈油品的酸值的测试方法。满足了材料性能的检测和质量监控的需要。     

电位滴定法测定标准物质DIANP的纯度

为了定值标准物质DIANP,建立了测定DIANP纯度的电位滴定法.该滴定法的条件是:DMSO作溶剂,NaOH溶液作反应试剂,使DIANP中的N-3和AgN03中的Ag+反应,生成AgN3沉淀.由EQP曲线算得标准物质DIANP纯度为99.85％,相对标准偏差为0.13％,与液相色谱法比较,结果无显著差异,该方法的扩展不...     

定氮仪测定化肥中总氮含量不确定度评价

对使用凯氏定氮仪测定肥料中总氮含量方法进行不确定度评定,分析该测定方法中不确定度的来源,通过数字模型对各不确定度分量进行评定,并给出了结果的报告形式。     

阳离子褐煤中腐殖酸及阳离子含量测定方法

阳离子褐煤是一种重要的钻井液处理剂。腐殖酸含量及阳离子含量是评价阳离子褐煤处理剂过程中的两个重要的指标。对阳离子褐煤中腐植酸及阳离子含量测定方法进行了探讨。在分析现有腐殖酸含量的测定方法后,提出一个新的腐殖酸含量测定方法,并通过实验验证了方法的可行性和准确性。在分析阳离子褐煤的生产工艺及分子结构后,通过17%的硝酸脱色,采用银量法测定Cl-含量来实现阳离子褐煤中阳离子含量的测定。     

氯碱中控分析中的常见问题

指出在氯碱中间控制项目检验过程中的一些典型不当或者错误之处,并对此进行了分析和讨论.