原子荧光光度法测定水中砷的不确定度评定

根据原子荧光光度法,用吉天AFS-930原子荧光光度计测定水样中的总砷,并且分析了主要的测量不确定度来源,即标准溶液不确定度、工作曲线不确定度和测量重复性不确定度,分别量化后合成测得总砷的测量不确定度。结果表明,影响其测量不确定度的主要因素是标准溶液,其它影响因素是次要的。     

气相色谱法测定水和废水中多氯联苯(PCB-206)不确定度的评估

测量不确定度是一种对测量结果可信程度的表示方法,影响测量不确定的因子主要有测量原理、方法、步骤、仪具、环境、人员、待测物等等,将这些影响不确定度因子对测量结果所产生的影响降至最低,是每一位计量人员共同努力的目标。通过液液萃取-气相色谱法测定水和废水中PCB-206的分析,找出影响不确定度的因素,并对各个因素的不确定度进行评估,得出测量不确定度为0.118μg/L。     

火焰原子吸收分光光度法测定土壤中铜元素的不确定度分析

对原子吸收分光光度法测定土壤中铜元素含量的不确定度进行评定,分析其不确定度的主要影响因素。结果表明影响其测量不确定度的主要原因是由标准溶液引入的不确定度、标准曲线引入的不确定度和重复测量引入的不确定度。     

原子荧光光度法测定水中汞的不确定度评定

对原子荧光光度法测定水中汞的影响因素进行分析,找出各影响因素的不确定度进行分析,给出合成标准不确定度和扩展不确定度。结果表明,影响其测量不确定度的主要因素是工作曲线带来的不确定度,其它影响因素是次要的。     

原子荧光光谱法测定铟锭中砷含量的不确定度评定

采用原子荧光光谱法对铟锭中的砷元素进行测定，分析了影响测量不确定度的主要因素，对测量重复性、工作曲线拟合、标准溶液配制、样品称量、回收率、样品消解6个不确定度因素进行了评定，阐述合成标准不确定度及扩展不确定度。结果显示，影响不确定度的主要因素是工作曲线拟合和测量重复性，次要因素是标准溶液配制和回收率，影响最小的因素是样品称量和样品消解。按照JJF 1059.1—2012的规定对不确定度分量进行合成，最终计算出扩展不确定度为0.000 02%,铟锭中砷含量测定结果的表示方式为0.000 21%±0.000 02%。     

原子荧光光度法测定水中砷的不确定度评定

对原子荧光光度法测定水中砷的影响因素进行分析,找出各影响因素的不确定度进行分析,给出合成标准不确定度和扩展不确定度。结果表明,影响其测量不确定度的主要因素是工作曲线带来的不确定度,其它影响因素都是次要的。     

高频电刀测量结果的不确定度评定

高频电刀测量结果的不确定度评定,主要内容就是评定功率测量的不确定度。本文分析了影响高频电刀功率测量值的不确定度因素,主要包括:测量重复性、高频电刀输出电流、电阻有效值,进而引入这些因素对高频电刀功率测量进行不确定度评定,为高频电刀的检测提供参考依据。     

气相色谱法测定二硫化碳中甲苯的测量结果不确定度评定

采用气相色谱法对二硫化碳中甲苯含量进行测试,找出影响测量不确定度的因素,通过建立数学模型对影响测量的各不确定度分量进行计算,求出合成不确定度和扩展不确定度,给出了气相色谱法测定二硫化碳中甲苯含量测量的相对扩展不确定度.     

白乳胶pH值测量结果不确定度的评定

依据JJF1059.1-2012《测量不确定度评定与表示》对GB/T8325-1987《聚合物和共聚物水分散体pH 值测定方法》中酸度计测量哥俩好1#白乳胶 pH 值的不确定度进行评定,对影响测量不确定度的因素进行探究。结果表明,影响测量结果的主要不确定度分量是仪器基本误差引入的不确定度,其次是重复性测量和缓冲溶液配制过程中引入的不确定度。     

致密定型耐火制品常温耐压强度测量不确定度评定

主要概述了致密定型耐火制品常温耐压强度测量不确定度的评定,以及在测量过程中测量不确定度的构成要素,影响常温耐压强度不确定因素的个分量,常温耐压强度的相对合成不确定度和扩展不确定度。在报告与测量结果相关联的测量不确定度时不同的表达方式。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

分解炉扩径的技术改造

我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

A study of miscibility of blends of polybutadienes of varying microstructure

The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

Process of acceleration of filtration of viscose

Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969.     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003