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关键词： 分析化学   实验教学   铜  

摘要： 胆矾中铜含量的测定是分析化学实验课中的必做实验,在原有实验的基础上,探讨了淀粉指示剂加入时间,KSCN加入时间对测定结果的影响.推荐该实验作为化学及近化学类专业低年级学生的开放性实验.

关键词： Multiple response optimization   Graphical optimization   Desirability function   Multiple-response function   Chromatographic response functions  

摘要： This manuscript covers the application of the main techniques for simultaneous optimization of multiple responses generated by the application of multivariate designs (two-factor factorial, Central Composite, Doehlert, etc.) or by chromatographic runs in the development of analytical methods. Special attention will be given to the graphical method, desirability function, multiple response function and chromatographic response functions, since they are more frequently used in the analytical area. The advantages, disadvantages, limitations, and potentialities of these methods will also be addressed, as well as some of their applications, commenting on real examples from the literature. Some less usual methods in multiple response optimization in Analytical Chemistry will also be commented.

关键词： 分析化学   教学   理论与实际相结合  

摘要： 理论与实际相结合是教学工作中必须坚持的一项基本原则,在分析化学教学中,结合学生的专业特点对教学内容进行合理的规划,将教学内容与日常生活、生产实践、新闻事件及学科发展相结合,努力激发学生的学习兴趣,增强教学内容的实用性、时代感和历史感,让学生在掌握分析化学基础知识、基本理论的同时,提高分析、解决问题的能力,也为提高科学素养和创新能力打下良好的基础。

关键词： 食品安全检测   分析化学技术   应用  

摘要： 随着社会经济的不断发展,科学技术的不断进步,人们也越来越关注自己的饮食安全问题,对于食品安全检测也投入了更多的精力。食品安全检测关乎人们的食品卫生安全,是人们健康成长的重要环节。当前食品检测技术也在更新换代,通过化学技术在食品安全检测中的应用,能够有效推进食品安全检测技术的进程。本文主要分析了化学技术在食品安全检测中的有效运用,希望能为我国食品安全检测提供参考。

关键词： analytical chemistry   characterization   covalent organic frameworks   fluorescence   separation  

摘要： Covalent organic frameworks (COFs) are a class of porous organic crystal materials. Since Yaghi and co-workers reported the first COF material in 2005 (Cote, A. P.;Benin, A. I.;Ockwig, N. W.;O'Keeffe, M.;Matzger, A. J.;Yaghi, O. M. Science 2005, 310, 1166-1170), COFs have shown great potential and research value in many fields, for instance, gas storage and separation, photoelectric function, fluorescence sensor, catalysis, drug delivery, dye and pollutant adsorption, electronic devices and so on. In this review, the frequently used analysis and characterization methods for COFs are summarized, and two to three examples are selected for each analysis and characterization technique in order to explain it in detail. The selected examples of COFs, which either had a unique structure and feature, or were reported for the first time, can be conducive to understanding COFs and their analysis methods better and faster. The application of COFs in analysis and detection is also introduced in this review, including fluorescent analysis, separation and enrichment. The cooperation between analytical chemistry and COFs is fully reflected. This review is helpful for the person interested in this subject and provides some useful information on the characterization methods and the applications of COFs for the beginners.

关键词： Decision making   Decision analysis   Multi-criteria decision analysis   Chemicals   Alternatives assessment  

摘要： Chemical and product manufacturers, spurred by recent environmental and sustainability initiatives, are seeking to embrace alternatives assessment to identify suitable alternative chemicals that are safer and more sustainable for use in consumer and/or specialty products. In this process, it is important to understand potential tradeoffs concerning final product design and redesign decisions. The objective of the present study is to characterize such tradeoffs using a set of six factors affecting product design: business strategy, economic considerations, functionality and performance, health/environmental endpoints, public perception, and regulatory factors. These factors were further disaggregated into 33 attributes distributed across the six factors. We assessed (i) tradeoff weights for each factor and (ii) the degree of influence of factors and attributes on a recent product design or redesign using a survey targeted at chemical and product manufacturers. Results from 33 completed surveys show that two factors are statistically different from equal weighting across the six factors: health/environmental endpoints and regulatory factors. Important attributes (and their factors) include: product price (economic considerations), product performance (functionality and performance), meeting desired specifications (functionality and performance), and company reputation (public perception). Principal component analysis yields nine principal components explaining 79% of the variance in the attribute scores dataset. These components load heavily on attributes such as public awareness of human and environmental health concerns, company reputation, product performance, and product price. The broader implications of our study include a realization that the context of the decision may dictate how business and economic concerns may be addressed differently than health and environmental endpoint concerns with the goal of navigating decision tradeoffs among manufacturers. [GRAPH

关键词： Matrix solid-phase dispersion, MSPD   Sea sand disruption method, SSDM   Solvent-free MSPD   Sample preparation   Chromatographic analysis   Extraction of unstable compounds  

摘要： The aim of this paper was to present the diversity of analytical challenges in which the MSPD technique is useful and the variety of sorbents that are currently applied to meet these challenges with particular emphasis on new research areas in which the MSPD process started to be applied. In addition, the paper presents new tools to improve both the MSPD yields using the MSPD processes supported by centrifugation, ultrasound, microwave and magnetism and its selectivity combining MSPD with other extraction techniques in particular, with microextraction ones, such as liquid-liquid microextraction dispersion or homogeneous liquid-liquid microextraction. Facing the problem of the increased urgency for further reduction of sample preparation costs and organic solvent usage, alternative MSPD approaches such as the solventless MSPD mode and MSPD with sand used as a dispersing material in the so-called sea sand dispersion method were discussed. (C) 2019 Elsevier B.V. All rights reserved.

关键词： 环境监测   分析化学法   应用探索  

摘要： 如今,环境的严重污染给人们的健康带来的危害越来越多。随着科学技术的不断进步,为了合理治理环境污染,人们研究出了很多方法,目的是对环境中的污染物进行有效的分析和监测,找到有效的治理方案。而分析化学是最常用的监测方法之一,因为这种方法的优势比较突出,所以在环境监测中得到了广泛的应用。分析化学在环境监测中的应用是指环境中的污染物的测量通过现代化学科学和技术和分析方法,以及这些污染物产生的原因,因此它是一个非常重要的环节。环境化学在环境保护中起着非常重要的作用,这也是为什么分析化学法在环境监测中被广泛的应用,并取得了一定的监测效果。分析化学方法在环境质量监测中的应用,在监测技术和环境适应性方面具有很大的优势。对分析化学法在环境监测中的应用进行了简要分析,并提出了若干优化建议,供参考。