ICP-AES法测定粉煤灰全组分化学元素的研究

采用偏硼酸锂熔样 ,电感耦合等离子体原子发射光谱 (ICPˉAES)法对粉煤灰实现一次熔样 ,全组分同时分析。对影响光谱测量的各种因素进行了较详细的研究 ,确定了最佳测定条件。该法的检出限为 0 .0 0 9～ 0 .83 1μg·ml-1,回收率为 91.5 4%～ 10 4.45 % ,RSD <3 .2 2 %。方法准确、快速、简便 ,用于粉煤灰中全组分测定 ,结果满意。     

水泥样品的ICP-AES全组分同时分析的研究

采用偏硼酸锂熔样,电感耦合等离子体原子发射光谱(ICP-AES)法对水泥样品实现了一次熔样,全组分同时分析。对影响其光谱测量的各种因素进行了较为详细的研究,确定了实验的最佳测定条件。结果表明,方法的检出限为0.005-0.857μg/mL,回收率为96.2％-104.0％,RSD<4.24％。该法准确、快速、简便,应用于水泥样品中全组分的测定,结果满意。     

石灰石全组分化学元素同时测定的研究

采用偏硼酸锂熔样,电感耦合等离子体原子发射光谱(ICP-AES)法对石灰石实现了一次熔样,全组分同时分析.对影响其光谱测量的各种因素进行了研究,确定了实验的最佳测定条件.结果表明,方法的检出限为0.005～0.221μg·mL-1 ,回收率为87.00%～110.00%,RSD小于3.25%.该法准确、快速、简便,应用于石灰石中全组分的测定,结果满意.     

光谱法测定粘土样品全组分化学元素的研究

采用偏硼酸锂熔样,电感耦合等离子体原子发射光谱(ICP-AES)法对粘土矿物实现了一次熔样,全组分同时分析。对影响其光谱测量的各种因素进行了较为详细的研究,确定了实验的最佳测定条件。结果表明,方法的检出限为0.005～0.857μg·mL-1,回收率为92.87%～104.46%,RSD小于4.50%。该法准确、快速、简便,应用于粘土矿物中全组分的测定,结果满意。     

ICP-AES法同时测定粘土质全组分元素的研究

采用偏硼酸锂熔样 ,电感耦合等离子体原子发射光谱 (ICP -AES)法对粘土矿物实现了一次熔样 ,全组分同时分析。对影响其光谱测量的各种因素进行了较为详细的研究 ,确定了实验的最佳测定条件。结果表明 ,方法的检出限为 0 .0 0 5 - 0 .85 7μg·mL-1,回收率为 92 .87% - 10 4 .4 6 % ,RSD小于 4 .5 0 %。该法准确、快速、简便 ,应用于粘土矿物中全组分的测定 ,结果满意     

硅质砂岩化学组成的ICP-AES准确测定

采用LiBO2熔样,电感耦合等离子体原子发射光谱(ICP-AES)法对硅质砂岩实现了一次熔样、全组分同时分析.对影响其光谱测量的各种因素进行了较为详细的研究,确定了实验的最佳测定条件.结果表明,方法的检出限为0.005～0.857μg/mL,回收率为90.20%～103.10%,RSD小于2.86%.该法准确、快速、简便,应用于硅质砂岩中化学组分的测定,结果满意.     

ICP-AES法测定陶瓷样品

采用高频熔样、电感耦合等离子体原子发射光谱(ICP—AES)法实现了对陶瓷中的Mg、Ca、Fe、Al、Ti和Zr的同时测定。对影响其光谱测量的各种因素进行了较为详细的研究，确定了实验的最佳测定条件。结果表明，方法的检出限为0．008—0．255μg／mL，回收率为95．14％--107．72％，RSD小于3．40％。该法准确、快速、简便，应用于陶瓷的测定，结果满意。     

ICP-AES法同时测定陶瓷样品中镁钙铁铝钛锆的研究

采用高频熔样，电感耦合等离子体原子发射光谱(ICP—AES)法实现了对陶瓷中的Mg、Ca、Fe、Al、Ti和Zr的同时测定。对影响其光谱测量的各种因素进行了较为详细的研究，确定了实验的最佳测定条件。结果表明，该方法的检出限为0．008-0．255μg/mL，回收率为95．14％-107．72％，RSD小于3．40％。该法准确、快速、简便，应用于陶瓷的测定，结果满意。     

高频熔样-ICP-AES法测定陶瓷中多元素的研究

采用高频熔样，电感耦合等离子体原子发射光谱(ICP-AES)法实现了对陶瓷中的Mg、Ca、Fe、Ti和Zr的同时测定。对影响其光谱测量的各种因素进行了较为详细的研究，确定了实验的最佳测定条件。结果表明，方法的检出限为0.008—0．255μg／ml，回收率为95．14—107．72％，RSD小于3．40％。该法准确、快速、简便，应用于陶瓷的测定，结果满意。     

粉煤灰在高性能自流平水泥混凝土中应用研究

在分析自流平混凝土特点的基础上，研究内掺粉煤灰量(％)对自流平混凝土强度和流展度的影响。根据试验数据总结出掺粉煤灰自流平混凝土28d的抗压强度规律，测试了掺粉煤灰自流平混凝土流展度的损失。采用强度等级为32．5级的普通硅酸盐水泥．掺加适量的花王高效减水剂．内掺40％～60％粉煤灰，水胶比0．35～0．50．能配制出C50高强度自流平混凝土。     

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。     

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。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

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。     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

我国聚碳酸酯工业发展概况

介绍我国聚碳酸酯生产能力和消费需求,对聚碳酸酯在信息工业中的应用作了简短介绍     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

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     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%.