A comparative study of color measurement lntstrumentation

A multiplant Quality Improvement Team [QIT] was firmed to develop and implement an evaluation program for various color measurement .systems as potential replacements for the then-current aging systems. The emphasis qf this article is the analytical methodology utilized to evaluate the various color systems. The evaluation program consisted cf two phases. Phase I was a general overview/review of several systems, while Phase II was an extensive internal comparative evaluation measurement systems. These were Milton-Roy's ColorMate HDS, HunterLab's Ultrascan, Datacolor's CS-5, and BYK-Gardner's The Color Sphere [TCS]. The main comparison criteria were interinstrument agreement [agreement between two instruments ofthe same system], user-friendly software and computer interface capability, vendor amenability to a long-term logistical and maintenance relationship, and price. All systems were evaluated by duplicate measurements on various color tiles, yarns, and polymer flakes-over 1600 measurements on each system. The systems were compared with an instrument matrix, a decision matrix, and a product matrix. The instrument matrix was a comparison qfinstrument parameters, software/math treatments, and economics. The decision matrix was a forced ranking of each system by each criteria category [1–4 scale, with 1 representing the best and 4 representing the worst]. The product matrix accentuated the relative importance ofone criterion category over another by multiplying the forced ranking by the criticality of the category. The criticality of a given category wus determined by consensus within the QIT. Thr combination qf the three matrices allowed the evaluator[.s] t o select the color rneasuremmt system that best satixfied the color measurement needs and requirements of their facility and their products. For this evaluation, all ofthe evaluated systems were superior to the then-current agingsystems. As a result of this methodology, one instrument emerged as clearly superior. © 1994 John Wrley & Sons, Inc.     

在数字显示光度计中差示光度法的新探讨

本文对差示光度法原理进行了探讨,并建立在数字显示分光光度计中负吸光值利用的理论依据。其中包括工作曲线的绘制,误差讨论。     

用N2O-C2H2火焰原子吸收光谱法测试羰基镍粉中镁

运用了N2O-C2H2火焰原子吸收光谱法进行羰基镍粉中镁的测定.介绍了镁最佳测定条件及呈良好线性范围的浓度.同时对样品消化处理条件及在测定中样品的干扰因素进行了综合考虑.该方法具有操作简便,容易掌握,分析周期短等特点.其灵敏度又能达到要求.重复性与准确度都达到了实验室分析计量测试和质量控制的要求.     

乙酰丙酮分光光度法测定室内空气中的甲醛

随着家庭装饰越来越豪华，装饰材料得到大量使用，室内空气中甲醛浓度超标现象也越来越严重，而甲醛是一种对人体健康十分有害的物质。本文介绍了使用乙酰丙酮分光光度法，测定室内空气中甲醛浓度的方法，以及对有关实验条件作了比对分析。     

Leaching of elements from packaging material into canned foods marketed in India

The interaction between food and metal packaging can be a potential source of trace elements release, which if ingested by humans can cause harmful effects. The present study is undertaken to investigate the leaching of elements from packaging materials into canned foods under different conditions of temperature, pH and storage period. Elemental analysis was done using Energy Dispersive-X-Ray Fluorescence (ED-XRF) for packaging materials and Inductively Coupled Plasma-Atomic Emission Spectrophotometry (ICP-AES) for canned foods. The concentration of Aluminum, Iron, Manganese, Silicon and Tin in the canned food products selected for analysis were found to be in range of 4.40–21.59 mg/kg, 2.38–19.70 mg/kg, 0.19–5.97 mg/kg, 16.46–359.63 mg/kg and 1.99–138.48 mg/kg respectively, when stored at room temperature within their shelf life storage period. The data revealed that the concentrations of elements under study were above the recommended limits of FAO/WHO Codex Alimentarius Commission.     

721型分光光度计电子系统简析

本文对721型分光光度计电子系统原理进行了描述，说明了各级电路的结构组成及元器件的作用，介绍了对稳压电源、微电流放大器的检查、维修方法和要求。     

云母波片属性的分光光度计标定法

利用分光光度计测定了云母波片偏光透射干涉谱，通过对该光谱理论和实验上的分析，提出了云母波片属性的分光光度计标定法。利用该方法可以准确标定波片的1／2或1／4属性以及波片的快慢轴方向。     

KY120—1型紫外光栅分光光度计的研制

KY120-1型分光光度计系单光束紫外可见光分光光度计,它具有性能稳定,操作方便,数字直读,结构紧凑等特点,是实验室中常规的分析测试仪器。本文概述整机方案设计,各部分的简要工作原理及主要技术性能,并介绍仪器在现场的应用结果。     

7230型分光光度计的维护和保养

7230型分光光度计是化学分析实验室中重要的精密光谱测量仪器,需要定期保养和及时维修排除故障,保证产品分析的正常进行。本文主要介绍仪器常见故障的维修及排除:(1)光路的调整方法;(2)波长的校正;(3)电路故障的查找及修理;(4)仪器日常使用中的保养。