浅谈显色温度和显色时间对钼酸铵分光光度法测定总磷的影响

在采用钼酸铵分光光度法测定总磷时,在实验室条件都相同的情况下,控制不同的显色温度进行显色,在不同的显色时间测量其吸光度,根据吸光度的不同分析探讨显色温度和显色时间对钼酸铵分光光度法测定总磷的影响。     

邻菲罗啉比色法测定铁含量的过程中显色温度与显色时间的控制

介绍邻菲罗啉比色法测定铁含量过程中控制显色温度与显色时间的方法,以消除显色温度低、显色速度缓慢造成的负误差。     

依据煤含量选择KMnO4加入量测生料中Fe2O3

新耀水泥厂采用的是全黑生料生产工艺。采用铝片还原法测定生料中Fe_2O_3时出现了无终点或终点显色仅仅是一瞬间的现象,既达不到化学分析要求的终点显色时间,样品的重现性也差。 滴定终点显色不易观察与样品重现性差虽说是两个不同性质的问题,但从实质上分析,终点显色不明显必然导致样品测定结果再现性差。经分析,我们认为影响终点显色观察的关键是样品中含有15％左右的煤,煤的含量是影响终点显色的主要因素。 众所周知,高锰酸钾是极强的氧化剂,在酸性介质中可以氧化有机物、硫化物和卤化物,而本身还原为无色的二价锰离子。依据操作程序,笔者通过调整高锰酸钾的加入量达到氧化黑生料中的有机物,进而脱色的目的,使滴定终点显色清晰,易于观察,判断无误,分析结果准确可靠。     

邻菲啰啉比色法测定铁含量的过程中显色温度与显色时间的控制

介绍邻菲啰啉比色法测定铁含量过程中控制显色温度与显色时间的方法,以消除显色温度偏低、显色速度缓慢造成的负误差。     

氨氮测定过程中有关问题的探讨

对影响氨氮测定的几个因素作了分析探讨。在一定温度下,显色时间对吸光度有影响 不同的pH值会影响纳氏平衡,对吸光度的测量产生影响。同时,还利用显色后的样品进行稀释比色分析。结果表明：氨氮测定的最佳显色时间为10min 样品分析前应先调为中性后再测定 对氨氮的稀释方法作了改进,证明改进后的样品稀释法是可行的。     

分光光度法同时测定水中Cr(Ⅵ)、Cr(Ⅲ)和总铬的条件优化

实验中用过硫酸铵代替高锰酸钾将Cr(Ⅲ)氧化成Cr(Ⅵ),再与二苯碳酰二肼(DPCI)进行显色反应.利用Cr(Ⅵ)与DPCI的显色反应及可见光谱法建立了同时测定水样中痕量Cr(Ⅵ)和Cr(Ⅲ)的方法.用此方法对含有Cr(Ⅲ)和Cr(Ⅵ)的混合水样进行测定,分析效果良好.对影响各反应的条件及检测条件进行了优化研究,建立了快速、简便、可靠地测定水样中铬含量的方法.     

车间空气中五氧化二磷测定方法的改进

试验了酸度及显色温度对测定结果的影响,控制溶液的酸度,是该测定方法成败的关键,采用合适的显色温度,使吸光度提高,从而提高方法的灵敏度。利用本技术测定车间空气中五氧化二磷的含量得到了较满意的效果。     

钼酸铵分光光度法测定总磷的方法研究

总磷是水体富营养化及评价水体质量的重要指标之一。钼酸铵分光光度法是测定总磷的主要检测方法之一。本文通过研究工作曲线是否消解,过硫酸钾加入量、消解温度以及显色时间的不同,来探讨钼酸铵分光光度法的影响因素,得出最佳实验方法为工作曲线不消解,过硫酸钾加入量为4 m L,消解温度可选择120～124℃,最佳显色时间10～15 min。     

新试剂5—（2‘—羟基—3’—5‘—二硝基苯偶氮）罗丹宁的合成及与钯（Ⅱ）显色反应

报道新试剂５－（２、－羟基－３、，５、－二硝基本偶氮）罗宁的合成及其与钯（Ⅱ）的显色反应。方法用于测定催化剂中钯的含量，结果较满意。     

水中总氰化物测定的影响因素分析

实验通过对异烟酸－吡唑啉酮分光光度法测定水中氰化物的显色体系进行试验,分析测定中的影响因素,探索测定的最佳条件,并应用于实际含氰水样测定,结果令人满意。     

陶瓷颜料的颜色测量与评价

本文针对国内陶瓷颜料颜色的主观目视评价法的局限性，从颜色科学基本理论出发，提出了三种客观的陶瓷颜料测量方法（即：分光光度法，颜色密度法，ＣＩＥ标准色度法），并分析了它们的颜色评价原理。这对实现陶瓷颜料的标准化生产具有重要意义。     

A comparative study of the emotional assessment of automotive exterior colors in Asia

This article compares color assessments of automotive exteriors at four locations in China, Thailand and Japan. This study employed painted panels of twelve colors, thirty sensory words and fifteen pairs of emotion variables. It also used reference figures of nine cars that included four styling categories, namely sedans, compacts, sport utility vehicles and sports cars. The results of like-dislike tests revealed that basic automotive exterior colors, such as black, white and red, were highly preferred across locations. However, geographical differences are apparent in the preference for some non-basic colors. To elucidate these geographical differences, a Chi-square test and principal component analysis were performed on the data on emotion variables. The results revealed both similarities and differences in color preferences among the four locations. Color preferences were similar in Hong Kong and Shanghai when simply evaluated by color samples. However, similar preferences for automotive exterior colors were observed in Hong Kong, Kyoto and Bangkok, but not in Shanghai. These results suggest that there is fluctuation in the emotion evoked by a color when the color is considered in the context of automotive exteriors. Therefore, this study indicates that automotive sales can be secured in the global marketplace by creating a single palette of exterior colors based on similar color preferences across countries. However, these results also indicate that preparing market-specific automotive-color line-ups can be an effective marketing strategy.     

The Effect of Enzymatic Treatment on Dried Vegetable Color

The usefulness of enzymatic treatment for improving dried vegetable color was checked using carrot and pumpkin as experimental material. The color differences were expressed using the L*, a*, b* chroma and hue values. For selected samples, color attractiveness was also assessed by ranking method. The results show positive influence of enzymatic treatment on dried carrot and pumpkin color retention. The best effects of improving color of dried material were obtained for Panzym SMASH XXL (for both species) and Rohament CL (for pumpkin). The positive influence of enzymatic treatment on attractiveness of dried carrot color enlarged during storage.     

The Effect of Enzymatic Treatment on Dried Vegetable Color

The usefulness of enzymatic treatment for improving dried vegetable color was checked using carrot and pumpkin as experimental material. The color differences were expressed using the L*, a*, b* chroma and hue values. For selected samples, color attractiveness was also assessed by ranking method. The results show positive influence of enzymatic treatment on dried carrot and pumpkin color retention. The best effects of improving color of dried material were obtained for Panzym SMASH XXL (for both species) and Rohament CL (for pumpkin). The positive influence of enzymatic treatment on attractiveness of dried carrot color enlarged during storage.     

采用color pilot软件处理数码照片评价牙齿的颜色变化

目的采用color pilot和Matlab软件处理数码照片及定点计算,评价数码照片是否能察觉牙齿颜色的变化。方法采用Vita比色板A2及C1作为试件,登士柏树脂附送的A2比色板作为参照,应用同一台数码照相机拍摄数码照片。根据光源、拍摄者、光圈、拍摄时间分组。将每张数码照片采用colorpilot软件处理,进行色彩矫正。结果经过计算机校正处理,同一试件的色差值基本上在1.5以下,有少数几项在1.5～3之间。其中,使用同一光圈的色差基本上都在1.5以下,不同的试验者,不同的时间,不同的照明环境对色差的影响并不明显。不同的光圈数值对色差的影响较大。不同的试件不论在何种条件下色差值均在3以上。结论经过色彩校正的数码照片可以察觉不同物体的颜色变化。     

聚烯烃着色母料的试制与应用

论述了聚烯烃色母料的配方设计，制造工艺及应用技术，并对色母料的性能进行了测试，为聚烯烃色母料的工业生产提供了参考数据。     

彩色胶卷的人眼视觉敏感技术

彩色胶片的彩色摹演过程是建立在彩色学基础之上,彩色摹演质量改进须使彩色胶片的彩色摹演过程尽量接近人眼视觉感色(HES)过程。这个过程是在电子计算机的发展基础之上,通过计算模拟减少巨大的试验工作量得以实现的。当前世界上的主要彩色胶卷生产厂家都有与这方面有关的文章发表。     

陶瓷颜料的颜色调配

依照陶瓷颜料的呈色原理及颜色光学的基本理论,探讨几种陶瓷颜料混合后颜色的反射曲线的形成,以此作为颜料颜色调配的依据,从而提高颜色调配的准确性。     

Annihilation kinetics of color center in irradiated syndiotactic polystyrene at elevated temperatures

In situ absorbance of syndiotactic polystyrene (sPS) at elevated temperatures is investigated. The irradiation environments of air, vacuum and oxygen are considered. The decreasing loss in transmittance after irradiation follows the sequence: oxygen, air and vacuum. The UV cut-off and shoulder wavelengths of sPS irradiated in an air atmosphere are greater than those in vacuum. Two types of color centers are responsible for the reduction of transmittance in the irradiated specimen. They are annealable and permanent. A first order annihilation model is proposed to analyze the annealable color centers. The results show that the annealable color center of sPS irradiated in vacuum required to overcome less energy barrier to annihilate than that in air, but the permanent color centers in the former is less than those in the latter after annealing. No annealable color center is observed in sPS irradiated in an oxygen atmosphere. The EPR spectra and FTIR spectra were also studied to enhance the understanding of kinetics of color center.     

A novel approach to color matching of automotive coatings

The coatings industry requires a fast and accurate color formulating process. Today the manual/visual color matching procedures are time consuming and require high skills, in particular when metallic and pearlescent colors are involved. For that reason, a new approach to the colorimetry of paints was followed. This resulted in the development of a system employing an easy to use instrument and powerful software allowing instant formulation of almost any desired color. The system comprises a portable multi-angle spectrophotometer in combination with a personal computer and dedicated color matching software. Development of both the instrument and the software resulted from research on optics, vision science, color mixing properties and computational procedures. In the software new algorithms describing the light-paint interactions (absorption and scattering) and the procedures applied at on site color matching are imbedded. The system retrieves the optimum paint formula through fully automated multi-angle spectral measurements followed by an analysis of the spectra and subsequent data bank search. When desired, correction procedures allow adjustment of the formula through additional measurements on a spray out sample.