小分队视导:促进教师专业发展的新型教研方式

针对当前区域教研存在的问题,阐述了"小分队视导"这一新型教研方式的工作特点和以问题为核心、以课例为载体、以名师为示范、以反思为宗旨、以"教学新时空"为平台、以反馈为手段,来促进化学教师专业发展的实践与思考.     

基于真实情境下的悬疑探究——“常见酸式盐”复习课教学设计

以"常见酸式盐"复习课为素材,以分类观、离子反应和氧化还原理论为指导,以真实问题为背景,以实验探究为手段,为如何整理零散元素化合物知识及研究物质性质提供了范例。     

化工基础多媒体课件开发探讨

以建构主义学习理论为指导,以现代教育技术为手段,以实施学习环境设计为核心,以有效发挥学生学习的主动性、积极性、创造性和提高教学质量为目标,通过多媒体技术与现代教学模式、方法和思想的有机结合,开发以研究性教学为背景的化工基础多媒体课件,初步实现了化工基础课程教学方法和手段的创新以及教学过程和内容的优化。     

以学生为中心的"五法联动"分析化学实验教学创新实践

针对化学实验教学过程中存在的学生预研不足和无暇思考探究,教师疲于知识传授和无暇顾及学生个性化需求的问题,分析化学实验课程以创新人才培养为目标,以课程思政为引擎,以实验项目为驱动,以在线课程为支撑,以教学平台为载体,通过实施"预研先导、问题思辨、实操探究、前沿引领、赛教结合"的"五法联动"教学设计,激活学生创新实践能力、自主学习意识、团队合作意识及创新精神,树立国家认同感、社会责任感与历史使命感,保障目标达成度实现。     

几种吸附剂对工业级粗四氢呋喃中丁醛的脱除效果研究

本文以硅藻土、分子筛、ＫＯＨ、ＮａＯＨ作为吸附剂,获得了脱除工业级粗四氢呋喃（ＴＨＦ）中丁醛的最佳温度为４８℃。在固定床反应器中,除醛以ＫＯＨ为佳,在釜式反应器中,以ＮａＯＨ为佳。     

部分析因设计法优化分散聚合制备单分散种子微球

采用分散聚合法,以正丁醇为分散介质、苯乙烯为单体、聚乙烯吡咯烷酮(PVP)为分散剂、偶氮二异丁腈(AIBN)为引发剂,制备单分散聚苯乙烯微球作为色谱填料的种子。实验以微球的平均粒径为主要考察指标,以GSD为次要考察指标,通过部分析因设计,获得了粒径为10μm的单分散(GSD=1.06)微球。     

一种饱和漆酚基功能涂料的合成及性能研究

以黄陵县生漆为原料,无水乙醇为溶剂,经过离心,然后以Pd/C为催化剂,加氢还原制备粗饱和漆酚。以石油醚-乙酸乙酯为洗脱剂,通过柱层析分离纯化,得饱和漆酚。LCMS分析发现,以脂肪支链为C_(15)的饱和漆酚为主且饱和漆酚在酸性介质中主要以醌的形式存在;进一步研究了以饱和漆酚、异佛尔酮二异氰酸酯(IPDI)为原料,以ε-己内酰胺为封端剂,合成了透明的饱和漆酚基功能涂料,用红外分析证实了产物的结构。测试了饱和漆酚基功能涂料涂膜的抗溶剂性能、耐酸碱性能和抗老化性能,结果表明漆膜具有良好的性能。     

深化文管类化学课程的素质教育

以化学知识为基础,以社会热点问题为载体,以专题讲座为形式,通过开设实验课、组织课堂辩论、加强论文写作等措施,提高文管类学生对学习化学课程的兴趣,深化素质教育。     

KAQ教育模式在“制药工艺学”教学中的应用

结合教学实践,介绍了以知识为基础、以能力为重心、以素质为标向的KAQ教育模式应用在"制药工艺学"教学实践中的具体做法和措施。     

抗肿瘤多核铂配合物的研究

多核铂配合物作为非经典铂抗肿瘤药物,其抗肿瘤机制与现有铂类抗肿瘤药物不同,因而在克服现有铂类抗肿瘤药物耐药性方面有着巨大的潜力。本文综述了多核铂类抗肿瘤药物的研究进展,以连接铂原子的桥配体结构的不同,可分为六大类:以烷基二胺及其衍生物为桥的多核铂配合物、以含氮杂环为桥的多核铂配合物、以羧酸根为桥的多核铂配合物、以卤素离子为桥的多核铂配合物、以含硫配体为桥的多核铂配合物及以其他配体为桥的多核铂配合物。本文还介绍了这几类多核铂配合物的抗肿瘤机理及在克服顺铂耐药性机理方面的研究进展。     

A new type of a spectrometric microtitration set up

A spectrometric microtitrator was developed from a spectrometer with a microreaction chamber and a tri-colour light-emitting diode (LED) as the light source. A novel, vertical, optical geometry of the spectrometric microtitration chamber was introduced and tested. This novel geometry also required a new method for mixing the titrated solution. A laboratory-made 50 μl syringe pump was used for the addition of the titration reagent. The 10-channel module for light effects, which makes possible a low-cost hardware approach to changing the titration protocols, was used for coordinating the operation of the microtitration set up. The system, with 10 channels and a regulated speed of operation, is flexible enough to allow an operator to generate different titration protocols. The performance test showed that the speed of titration-reagent addition can be regulated in the range from 0.87 to 21.8 μl min⁻¹. The smallest achievable volume addition is equal to 35 nl. The mixing rate can be continuously regulated by an electrical pulse that initiates the mixing cycle. The quickest rate is every 1.6 s, and the slowest rate is every 4.8 s. The spectrometric microtitration set up was successfully tested for several different real-life spectrometric titrations, including an iodometric titration, a determination of CO₂ in deionised water, and EDTA titrations of copper(II) ions with no indicator. The volume of the examined solution can be as small as 220 μl. The titration-reagent consumption is usually between 10 and 35 μl. Coefficients of variation of the end point volume determination (n = 5) at different experimental conditions and different average volumes of consumed reagents (7.06, 12.17 and 22.88 μl) were 2.4, 1.3 and 1.2%, respectively. The novel geometry of the spectrometric microtitration chamber proved to be useful for real-life applications.     

诺氟沙星的交流示波极谱滴定法研究

本文报道了示波极谱滴定法测定诺氟沙星的含量。用ＰＨ４．４的ＨＡｃ－ＮａＡｃ缓冲溶液溶解药样，并与过量的四苯硼钠作用生成沉淀。过滤后，用硫酸亚铊回滴过量的Ｎａ－ＴＰＢ，由示波极谱图［ｄＥ／ｄｔ＝ｆ（Ｅ）］上ＴＰＢ切口的消失指示滴定络点，进而在该溶液中进行空白实验。     

络合体系中的相对滴定法及其应用于铝的测定

本文提出了络合体系中的相对滴定分析法，它以滴定到一定的状态时，滴定剂体积与被测物的基之间的线性关系为定量基础，用仪器分析的定量方法进行定量，适应于所有类型的络合体系，即使对滴定突跃很小或根本无突跃的体系也同样适用。用氟离子滴定铝离子的实验结果表明本方法的精密度很高。一般相对误差小于0．1％。即使对于铝离子的量小到10-7mol／L时，在最佳实验条件下的相对误差也不大于0．2％。该方法既具有滴定分析法的高精密度，又具有仪器分析法可以测量微量物质的优点，并且设备和方法简单。     

Indirect complexometric determination of cadmium(II) using 1,10-phenanthroline as selective masking agent

An indirect complexometric method is described for the determination of cadmium(II), 1,10-phenanthroline being used as masking agent. Cadmium(II) in a given sample solution is initially complexed with an excess of EDTA and the surplus EDTA is titrated with lead nitrate solution at pH 5.0–6.0 (hexamine), using xylenol orange as indicator. An excess of 1,10-phenanthroline is then added and the EDTA released from the Cd-EDTA complex is titrated with standard lead nitrate solution. Results are obtained for 1.5–57 mg of Cd with relative errors 0.90% and standard deviations 0.06 mg. Cu(II), Co(II), Hg(II), Ni(II), Zn(II), Pd(II), Tl(III), Au(III) and Sn(IV) interfere, but can be easily masked. The method is applied for the determination of cadmium in synthetic alloy solutions.     

铷和铯含量的示波极谱滴定法测定

用了示波极谱滴定法测定硝酸盐样品中铷和铯的含量，回收率为９７７８％～１００３％，相对标准偏差均值为０２１％。该法以示波极谱图形突变来确定滴定终点，终点直观，不受溶液颜色、沉淀的影响，具有准、快、简、省的特点，有广泛的应用价值     

Complexometric determination of copper(II) in ores,alloys and complexes using 2-mercaptoethanol as indirect masking reagent

A complexo-titrimetric method for the determination of copper(II) in the presence of other metal ions is described, based on the selective masking ability of 2-mercaptoethanol towards copper(II). Copper and other ions in a given sample solution are initially complexed with an excess of EDTA and the surplus EDTA is titrated with zinc sulfate solution at pH 5.0–6.0 (hexamine), using xylenol orange as indicator. A known excess of 2-mercaptoethanol solution (10%) is then added, the mixture is shaken well and the released EDTA from the Cu-EDTA complex is titrated against standard zinc sulfate solution. The interferences of various ions are studied and the method is applied to the determination of copper in its ores, alloys and complexes. Reproducible and accurate results are obtained for 2.5–40 mg of Cu with relative errors 0.4% and standard deviations 0.04 mg.     

Complexometric determination of cadmium using 2-Mercaptoethanol as masking reagent

A complexometric method for the determination of cadmium(II) in presence of other metal ions is described based on the selective masking ability of 2-mercaptoethanol towards cadmium(II). Cadmium and other ions in a given sample solution are initially complexed with excess of EDTA and the surplus EDTA is titrated with lead nitrate solution at pH 5.0–6.0 (hexamethylentetramine), using xylenol orange as indicator. A known excess of 2-mercaptoethanol solution (10% alcoholic) is then added, the mixture is shaken well and the released EDTA from the Cd-EDTA complex is titrated against standard lead nitrate solution. The interferences of various ions are studied and the method is applied to the determination of cadmium in its complexes. Reproducible and accurate results are obtained for 3.5–25mg of Cd with relative errors 0.65% and standard deviations 0.06 mg.     

用交流示波极谱滴定法测定磺胺类和对氨基水杨酸钙药物

本文采用交流示波极谱滴定法测定磺胺和对氨基水杨酸钙两类药物的含量,与其它方法相比,具有快速准确、终点直观、用样量小的特点。溶液的颜色、产生的沉淀、片剂中的赋形剂对测定均无影响。     

库仑滴定法测定有机硅样品中的氮含量

本文利用库仑滴定法研究了高分子和低分子硅氮化合物及含氮有机硅样品中氮含量的测定,并研究和讨论了影响测定结果准确性的因素。