Formulating Pantone colors by unused base inks,formulation software,and a spectrophotometer

Unused base inks that are not going to be used for printing production are considered to be hazardous materials. Their disposal is expensive, and strict environmental regulations should be followed for their disposal. As an alternative, this article describes how spectral data of unused base inks can be gathered and mixed to generate new colors to incorporate them back to print production for small‐volume jobs. In this study, 30 different Pantone colors were selected as target colors. The CIE L*a*b* spectral data of Pantone colors and unused base inks were gathered via a spectrophotometer. A commercial formulation software, based on multiflux theory and CIE L*a*b* color space, was used to formulate ink recipes that contained the base inks. To quantify the performance of ink recipes, they were mixed and printed using an offset printability tester. The CIELAB ΔE*_ab metric, developed by CIE, was used to detect the visual differences between the target Pantone Color and printed colors.     

微纳米气泡形成羟基自由基的研究进展

从微纳米气泡溶液中是否可以产生·OH、·OH的鉴别方法、·OH的生成机理以及强化·OH的生成等几个方面论述了微纳米气泡溶液中生成·OH的研究进展。电子自旋共振技术和荧光分光光度法作为检测·OH的2种技术,均存在一定的误导性,对于荧光分光光度法,最重要的就是排除H2O2的干扰。此外,目前要获得含有高浓度·OH的微纳米气泡溶液,使用氧气气源是前提,且可通过超声空化或使用铜作为催化剂等进一步增强·OH的生成。虽然机理问题尚未明确,但微纳米气泡技术已在农业、养殖业和废水处理等领域有了广泛的应用,并展现出良好的应用前景。     

工业用氢氧化钠中铁含量的测定

简述了用分光光度法测定工业氢氧化钠中铁含量的原理和试验步骤,通过多次试验寻找出影响测铁准确度的方法,并且对其结果进行分析和探索。     

Effects of cold plasma on the color parameters of Hyssop (Hyssopus officinalis L.) using color imaging instrumentation and spectrophotometer

This research was conducted to evaluate the effects of cold atmospheric plasma treatment on the color of Hyssop (Hyssopus officinalis L.) and also to compare the usage of the spectrophotometer vs the color imaging instrumentation for the evaluation of the treatment on the color parameters. The experiments were investigated at different treatment times of 1, 5, and 10 minutes and the voltage values of 17, 20, and 23 kV. Possible changes of color were evaluated by using CIE L*a*b* values obtained with HunterLab colorimeter and CIE L*a*b* values obtained with a digital still camera (DSC) using digital image processing (MATLAB software). The values of L*, a*, and b* of the samples were obtained using both the methods. The results revealed that the L*, a*, and b* values of the treated Hyssop samples changed with increasing the treatment time and the voltage applied. Evaluating the interaction effects revealed that there was a significant difference in the (−a^*/b^* ) ratio. In addition, the results showed that the effects of all variables on the color parameters were significantly different in the case of the DSC using digital image processing. However, these effects were not significantly different using HunterLab colorimeter except for time variable and interaction effects of a* and (−a^*/b^* ) ratio. The lightest green color and the maximum chlorophyll content loss were observed for 23 kV applied over 10 minutes. Based on the results, the digital image processing can be used as a practical tool to study the variations at the color of dried Hyssop leaves after cold plasma treatment.     

捕收剂对铅锌硫化矿浮选的影响及在矿浆中的浓度分布

研究了捕收剂对铅锌分选的影响 ,应用紫外光分光光度法测定矿浆中捕收剂的浓度。通过单矿物浮选及实际矿石浮选试验 ,考察了捕收剂对黄铁矿、方铅矿和闪锌矿浮选的影响 ,试验表明 ,对方铅矿来说 ,乙硫氮具有较好的选择性 ,而黄药对这三种矿石都具有较好捕收能力 ,因此 ,在实际生产中往往采用混合用药。通过捕收剂用量试验发现捕收剂用量必须加以合理控制 ,用量太大 ,会影响产品的质量 ,用量太小又会影响回收率乃至生产成本 ,因此对矿浆中的捕收剂浓度加以检测是必要的也是有意义的。利用紫外光分光光度法对现场的捕收剂浓度进行了检测 ,结果表明 ,对于同一个作业 ,尾矿产品的矿浆浓度大于精矿产品 ;对于精选作业来讲 ,其相应产品的药剂浓度随着流程前进逐步降低 ,对于粗选作业来说 ,规律相反 ,浓度随着流程前进逐步升高。     

用主成分回归法同时测定Zn~(2+)、Cd~(2+)、Pb~(2+)和Cu~(2+)的研究

使用聚类分析对不同缓冲体系下Zn2+、Cd2+、Pb2+、Cu2+的吸光度光谱数据分析,通过数量化的方法确定pH值=6.0的最佳缓冲体系。通过单因素实验分析确定缓冲溶液用量为5.0ml、显色剂用量为3.0ml、环糊精用量为2.0ml及最佳显色时间10min。绘制Zn2+、Cd2+、Pb2+、Cu2+的标准曲线,结果表明其具有良好的线性范围和线性加和性。应用主成分回归法计算含有干扰离子的待测水样中Zn2+、Cd2+、Pb2+、Cu2+的浓度,并计算出平均回收率为109.64%、92.77%、98.18%、102.28%,相对标准偏差为11.48%、11.12%、6.34%、4.72%。     

Correction of single‐beam sample absorption error in a hemispherical 45°/0° spectrophotometer measurement cavity

A mathematical model for quantifying single‐beam sample absorption error in a hemispherical 45°/0° measurement cavity is derived and tested by measuring diffuse reflectance standards with a prototype visible‐range spectrophotometer. A methodology is described for using this three‐parameter model to correct for sample absorption error in any single‐beam spectrophotometer. © 2013 Wiley Periodicals, Inc. Col Res Appl, 39, 436–441, 2014     

Correction of second‐order‐diffraction errors in spectrophotometry

Conventional diffraction gratings are designed so that most of the light striking the grating is diffracted toward the “first‐order beam” direction, but in practice, some of the light may be diffracted towards the “second‐order beam” direction, so that the light striking a particular sensor pixel may be a combination of both first‐ and second‐order components. This causes errors in the output of diffraction‐grating based UV–visible spectrometers. A new method has been developed to correct such errors by calibrating the optical system with a UV‐excluded standard (such as an orange tile) and a UV‐included standard (such as a white tile). These two calibrations can predict the relationship between first‐order‐only signals and first‐and‐second‐order combined signals at sensor pixels (nominal wavelengths) where there is second‐order light, and thus help correct the second‐order diffraction error. This compensation method applied on the reflectance measurement of a set of color ceramic tiles showed significant improvement on the accuracy of the result. © 2016 Wiley Periodicals, Inc. Col Res Appl, 42, 189–192, 2017     

4600串联式原子化器原子吸收分光光度计能量提高的探讨

为了解决串联式原子化器原子吸收分光光度计因光路延长带来的紫外区能量降低问题,重点探讨了对4600串联式原子吸收分光光度计的光路和电路进行优化设计使紫外区能量得到提高的方法.通过对砷元素(As193.7nm)边缘能量进行重点测试,结果证明:线性、特征量、精密度等指标符合国家标准.     

微回流紫外分光光度法测定水质COD的研究

在重铬酸钾法的基础上,以增加催化剂和氧化剂的相对用量来缩短回流时间,用紫外分光光度计测定稀释回流液吸光度来替代硫酸亚铁铵的滴定,构建了水质COD值与吸光度之间的关系模型。结果表明该法测定水样的最大吸收波长为349 nm,相对标准偏差小于2.6%,测定范围在10～700 mg/L,可以满足一般水质的快速测定要求。