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关键词： 分析化学实验室   重金属废液处理   含锰废液   铅铋废液   含银废液  

摘要： 本文主要针对分析化学实验室常见重金属废液的处理进行了研究分析,含锰废液、铅铋废液、含银废液分别利用重金属的理化性质进行处理,将重金属从废液中分离出来已达到废水的排放要求。

关键词： Second-Year Undergraduate   Analytical Chemistry   Laboratory Instruction   Demonstrations   Internet/Web-Based Learning   Multimedia-Based Learning  

摘要： This project utilizes visual and critical thinking approaches to develop a higher education synergistic prelab training program for a large second-year undergraduate analytical chemistry class, directing more of the cognitive learning to the prelab phase. This enabled students to engage in more analytical thinking prior to engaging in the analytical action in the laboratory, motivating students to arrive at classes prepared to engage in the material rather than the mechanics (physical processes) of the practical exercises. This reduced the likelihood of cognitive overload at the beginning of the class. Video demonstrations were developed providing both visual demonstrations with audio explanations to reinforce each concept, and students were guided to these through compulsory prelab e-quizzes. The effectiveness of the program was evaluated by academic performance and an attitudinal survey. Attitudes toward the prelab program were very positive, particularly for the e-quizzes. There was no improvement on academic performance in laboratory reports;however, students reported that the prelab material had a positive effect on their learning, and that they were able to enter the laboratory with high levels of perceived preparedness. Given that student experiences in the laboratory are arguably as important as assessable outcomes, an attitudinal study such as this is extremely important.

关键词： Sorbent   Graphitic carbon nitride (g-C3N4)   Tri-s-triazine units   Metal ions   Aromatic compounds   Analytical chemistry   Sorption mechanism   Modification  

摘要： As a green and efficient sorbent, graphitic carbon nitride (g-C3N4) with aromatic tri-s-triazine units has shown great potential for the enrichment or removal of metal ions and organic aromatic compounds, which makes it a promising candidate to complement graphenes in analytical chemistry. The in-built N-rich functional groups and electronic delocalization properties endow g-C(3)N(4)with complex sorption mechanism, containing complexion, hydrogen bond, redox reaction, 7t it conjugation, hydrophobic effect, acid -base reaction and electrostatic interaction. The structure and surface physicochemical properties related to the sorption behavior are mainly depended on the preparation and sorption conditions, such as polymerization temperature, polymerization precursors, the solution pH and ionic strength. As a new sorbent, g-C3N4 has been applied to the sample pretreatment in analytical chemistry with solid -phase extraction (SPE), magnetic solid -phase extraction (MSPE), and solid -phase microextraction (SPME) modes, recently. At the same time, a series of modification methods and technologies have been exploited to modify the structural and surface physicochemical properties of g-C3N4, facilitating more effective and selective sorption process. To raise awareness of the superior properties of g-C3N4 and facilitate its applications as a sorbent in analytical chemistry, the sorption properties (sorption mechanism, influence factors of sorption behavior), applications to the sample pretreatment and structural modifications of g-C3N4 are reviewed. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Upper-Division Undergraduate   Analytical Chemistry   Instrumental Methods   Quantitative Analysis   Mass Spectrometry   Separation Science   HPLC   Hands-On Learning/Manipulatives   Laboratory Instruction   Food Science  

摘要： A two-part laboratory experiment was designed for upper-level analytical chemistry students to provide handson experience in the use of high performance liquid chromatography (HPLC) for separation and inductively coupled plasma mass spectrometry (ICP-MS) for detection. In the first part of the experiment, the students analyze total arsenic in apple juice purchased from local grocery stores using direct injection ICP-MS. In the second part, different species of arsenic in the same apple juice samples are determined using HPLC ICP-MS. Quantification is performed based on two methods, standard addition and external calibration curve, to demonstrate how sample matrix can affect the accuracy of the analysis. The experiments provide the opportunity to introduce acid/or review several fundamental analytical chemistry concepts: chromatographic separations, mass spectrometry, inductively couple plasma, matrix effect's, calibration methods, internal standard, and basic statistical tests. Undergraduate students enrolled in the Instrumental Analysis Laboratory class at the University at Buffalo performed this experiment successfully during the 2015 spring semester.

关键词： 天平称量   滴定操作   常见问题  

摘要： 这么多年,一直从事分析化学工作,在具体实践中,发现人们对于天平称量、滴定操作不是很规范,在具体过程中还有很多问题,本文主要分析了产生这些问题的原因,以及提出解决这些问题的方法。

关键词： 电分析化学技术   元素硫   检测   应用   发展  

摘要： 在我国电分析化学技术是一项重要的技术,其主要是对化学工程进行分析、设计、制造和管理等。目前我国每年从世界石油市场进口大量原油,其中大部分是从中东地区进口的含硫原油甚至高硫原油,硫含量是影响原油及其产品质量的重要指标,硫含量高,通常会伴随元素硫、硫化氢、硫醇等腐蚀性含硫化合物的含量高,而这些腐蚀性含硫化合物会直接对炼油装置、机械设备、储运设施等产生破坏作用,所以对硫含量的检测及含硫化合物的分析是石油分析的重要内容。

关键词： 分析化学   自然资源   岩石矿物找矿   矿物标志  

摘要： 伴随着经济的快速增长,人类对自然界的探索越来越广泛,需求也越来越多样化,自然资源是大自然为人类提供的宝贵资源,将分析化学运用在岩石矿物找矿中,可以提高找矿的效率,为了满足人们对自然资源日益增长的需求,促进找矿事业的发展,寻求有效的探测方法势在必行。文章主要探讨分析化学在岩石矿物找矿中的应用要点。

关键词： 分析化学实验   实验教学   教学质量   改革   创新  

摘要： 分析化学实验是化学类专业一门重要的基础实验课程。为了提高分析化学实验教学效果,对分析化学实验教学进行了改革。通过增加实验安全考试环节,强化学生安全意识和安全知识;通过改进实验教学方法,提高学生学习兴趣,调动学生学习积极性;通过更新实验教学手段,使实验教学更为生动形象,易于理解;通过加强实验教学管理,提高实验预习效果,规范实验基本操作,培养良好的实验习惯。实践证明,分析化学实验经过改革与创新后,教学质量得到了进一步的提升。