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关键词： 滴定分析   终点变色   终点拖长   终点返红  

摘要： 分析化学是矿物加工工程专业的一门重要专业基础课,实验课目的是锻炼学生研究能力和实验操作技能。针对不同水质分析中钙镁含量测定过程中出现的一些特殊现象进行分析讨论,对滴定分析中终点变色不敏锐,终点拖长,终点返红问题进行了理论分析,从理论上解释这些现象产生的原因,并提出不同水样在测定过程中应采用不同的方法处理,这样会消除干扰增加测定结果的准确性。

关键词： Analytical chemistry   Actinide   Americium oxide   Plutonium  

摘要： Presented here are three case studies that demonstrate the breadth of bulk actinide analytical chemistry at Los Alamos National Laboratory (LANL). This laboratory was established during the Manhattan Project and is still considered one of the premier analytical laboratories for special nuclear materials characterization around the globe. First, the analytical chemistry of Pu-238 is presented, showcasing the unique challenges of this high activity isotope. Next, the analysis of (AmO2)-Am-241 is discussed from the perspective of supporting nascent production at LANL. Finally, the analytical chemistry support of the production of plutonium non-destructive assay standards is discussed. These examples paint a picture of the analytical capabilities needed to meet the dynamic challenges of LANL's nuclear programs.

关键词： Macro-plastic   Leachate   Endocrine-disrupting compounds   Eco-toxicology   Marine debris  

摘要： Plastic debris is an emerging worldwide threat to marine biota. Marine species may face unique challenges in low-flow estuarine systems with a high abundance of "macro-sized" (> 4.75 mm) plastic due to the leaching of constituents and adsorbed contaminants. To simulate this leaching process, plastic samples recovered from the North Pacific Gyre along with corresponding UV-irradiated virgin plastic and non-irradiated virgin plastic counterparts were incubated in saltwater for 30 days at ambient temperatures ranging from 17 to 25 degrees C. Following solid-phase extraction, water samples were fractionated with sequential methanol elution from 10 to 100% and evaluated using in vitro assays assessing estrogen receptor (ER) and aryl hydrocarbon receptor (AhR) activities. In vivo responses (vitellogenin [vtg] and cytochrome p450 1A [cyp 1a] mRNA) were measured following 5-day exposures in Japanese medaka (Oryzias latipes) larvae (3 days post hatch). Estrogenic plasticizers, co-planar PCBs and PAHs were quantified in the extracts using targeted GC-MS/MS and UPLC-MS/MS. In vitro estrogenicity showed highest activity in the 70% methanol fraction for all plastic leachate exposures. Whole extract in vitro estradiol equivalent (EEQ) values were 4.34 +/- 2.65, 8.79 +/- 2.09 and 13.78 +/- 3.64 ng/L, for virgin plastic, UV-irradiated virgin plastic and North Pacific Gyre-recovered plastic, respectively (mean +/- SD). Significant vtg induction was observed in medaka larvae exposed to leachate extracts from North Pacific Gyre recovered plastic and UV-irradiated virgin plastic (9.9-fold, p = 0.039 and 10.1-fold, p = 0.042, respectively). Chemically-determined EEQ values were also localized in the 70% methanol fraction. Whole leachate extract chemical EEQ values were 0.33 +/- 0.07, 1.64 +/- 0.62 and 11.4 +/- 2.13 ng/L, for virgin plastic, UV-irradiated virgin plastic and North Pacific Gyre-recovered plastic, respectively. In-vitro AhR activity was highest in the 70% methanol elution w

关键词： 多样化教学   分析化学   高职药学  

摘要： 分析化学作为高职院校药学专业必修基础课程,是学习药物分析、药物化学等课程的基础,传统教学模式限制了高职学生学习效果,本文介绍了通过改革完善教学评价体系,采取案例分析讨论、微课、云平台等多样化教学方式激发学生学习兴趣,提高课堂效率,这样更有利于高职应用型药学专业人才的培养.

关键词： 化学课程   高中教学   比较   国际   学生  

摘要： 课程结构决定课程的功能,影响课程目标的达成。 在我国《普通高中化学课程标准》的修订中,必然涉及对我国普通高中化学课程的进一步思考甚至重构,因此,通过对美国课程教学比较,总结国际上高中化学课程的特点和趋势,对我国高中化学课程结构的设计具有重要的参考和借鉴价值。本文通过对国际上比较有影响的国家和地区的高中教学进行了横向比较分析。研究表明,当前国际高中化学课程设置形式的主流趋势是综合课程与分科课程并存;化学课程类型以并列式和分水平递进式设计相结合;化学课程设置开始重视学生的“个性化”基础;高中化学分科课程多属于选修课程,且以轨道式选择为主流。

关键词： 分析化学   陶瓷   检测   应用及举例  

摘要： 就分析化学总体而言在结晶材料、半导体材料及超纯物质等的物理分析及化学应用中起到了非常关键的作用,在相关材料合成及控制工艺等方面也需要依靠分析化学的实验及结论,因此分析化学在整个材料行业的应用相对比较广泛。本文就将通过分析分析化学在陶瓷原材料检测方面的应用,进行简单举例、探讨分析化学的发展方向及对材料行业发展的影响,为分析化学未来的发展提供更多的可能性。

关键词： 分析化学   课程改革   新工科背景  

摘要： 世界范围内综合国力竞争愈加激烈,要求工程技术人才具备更高的创新创业能力和跨界整合能力,加快新工科建设,助力经济转型升级。为适应"新工科"的发展背景,化学专业应该更加强调应用性和与其他学科的关联性,注重培养复合型人才。为了提升传统理论授课的教学效果,深化教学改革,本文将从教学内容和教学模式等方面进行研究及探索。旨在提升化学相关课程的教学新颖性,提高学生的创新性和主观能动性。