不同配伍比例对当归-川芎药对中5个有效成分含量的影响

目的：建立当归-川芎药对中绿原酸、阿魏酸、洋川芎内酯I、洋川芎内酯A和藁本内酯的含量测定方法,考察不同配伍比例对当归-川芎药对中5个有效成分的含量影响。方法：色谱柱GL Sciences Inertsil ODS-C18;流动相：乙腈-0.2%磷酸,梯度洗脱;检测波长：290 nm;进样量：10μL,柱温30℃;流速1.0 mL/min。测定当归-川芎药对的单煎液以及不同配伍比例的合煎液(1∶2,1∶3,1∶4,1∶1,2∶1,3∶1,4∶1)中5个有效成分的含量。结果：合煎液中各成分提取率均大于单煎液中提取率,且当归-川芎配伍比为1∶4时,有效成分含量最高。结论：当归-川芎(1∶4)的配伍比例有利于5个成分的溶出。     

汉中绿茶中铜、铁、锰、锌、氟含量的测定

为了解汉中地区绿茶中铜、铁、锰、锌、氟的含量,采用微波消解-原子吸收分光光度法及氟离子选择电极法对汉中绿茶中的铜、铁、锰、锌、氟含量进行了测定。结果显示,汉中绿茶中铜、铁、锰、锌、氟的含量范围分别为66.96μg.g-1,482.30μg.g-1,854.57μg.g-1,89.75μg.g-1,48.6μg.g-1。与文献相比,汉中绿茶中铁、锌含量远高于平均值,锰和铜的含量与平均值相当;氟含量略低于绿茶平均氟含量。     

凤凰茶园茶叶和土壤中铜铁锌锰含量的相关分析

本文以潮州市凤凰茶园茶叶和土壤为研究对象,旨在了解他们之间铜、铁、锌和锰的相关性。结果表明,茶叶中锰含量、铜锌比与土壤中对应的锰含量、铜锌比存在着一定的相关性。     

不同前处理方法测定葡萄酒中锰、铁、铜含量的比较研究

考察了微波消解、湿法消解、干法灰化3种不同前处理方法对葡萄酒中锰、铁、铜含量测定结果的影响。结果表明,微波消解法操作简便快速,结果准确,能够满足葡萄酒中锰、铁、铜含量的测定分析。     

铝合金中硅、镁、铜、铁、锰元素的测定

铝合金常常用回收的废铝重新进入熔铸冶炼,而废铝中硅、镁的含量很低,为了达到铝合金的硬度和可塑性,便于挤压成型,需检测铝锭中硅、镁、铜、铁、锰元素的含量.采用分光光度法测定了工业生产过程铝合金中硅、镁、铜、铁、锰元素的含量.     

FAAS法连续测定高吸水性树脂对铜锌铁锰吸持量

研究了用火焰原子吸收光谱法连续测定高吸水性树脂对铜、锌、铁、锰吸持量的方法。高吸水性树脂在含铜锌铁锰离子的水溶液经吸水后过滤,测定滤液中铜锌铁锰含量,可间接计算出高吸水性树脂吸肥量。回收率为94%~105%,RSD为1.9%~4.7%。该方法简便、准确、实用。     

超级微波消解-ICP-OES/ICP-MS测定特殊医学用途配方食品中13种元素

采用消解液硝酸∶超纯水=2∶1,温度230℃的超级微波进行消解,实现了电感耦合等离子体发射光谱法/电感耦合等离子体质谱法测定特殊医学配方食品中钾、钠、钙、镁、铁、锰、铜、锌、磷、硒、铬、钼、铅等13种元素含量。其线性回归方程的线性关系良好,检出限0.001～0.062 mg/kg,加标回收率95.6%～108.5%,相对标准偏差0.41%～3.61%。该方法操作简单快速,为批量测定特殊医学用途配方食品中元素含量提供有效的分析方法。     

茶叶中微量元素的检测与分析

硝酸-过氧化氢消解绿茶,阳极溶出伏安法测定茶叶中铁、锰、铜、锌的含量。研究发现,在硝酸-氯化钠底液中,浓度在0.00～100.00μg/mL范围内,峰电流与四种离子的浓度均呈良好的线性关系,测得铁、锰、铜、锌四种元素精密度的相对标准偏差分别为0.22%、0.12%、0.05%、0.30%,精密度高,重现性好。该测定方法简便、快捷,适用于茶叶中微量元素含量的分析。     

线性扫描伏安法测定蛋氨酸螯合铜

提出了在0．05tool·L-1aCI-06mol·L-1cl体系中以线性扫描伏安法间接测定饲料添加剂中蛋氨酸螯合铜的方法。依据蛋氨酸铜螯合物不溶解于水但能溶解于酸的特性,首先采用铁氰化锰修饰玻碳电极在中性介质中测定试样中游离的蛋氨酸,然后在酸性介质中测定总蛋氨酸含量,通过蛋氨酸螯合铜组成成分的化学计量关系,计算出蛋氨酸螫合铜的含量。方法准确、快速、简便,用于实际样品的测定,结果满意。     

ICP-OES法测定钴白合金中主元素含量

采用电感耦合等离子体原子发射光谱(ICP-OES)法测定了钴白合金中主元素钴、铜、铁、镍和锰的含量。结果表明:采用混酸(王水+氢氟酸+高氯酸)溶解钴白合金样品效果良好;钴、铜、铁、镍和锰元素的线性良好,相关系数R~2在0.99958～0.99991之间,加标回收率在97.80%～102.31%之间,相对标准偏差(RSD)均不大于2.81%。建立了可实现多元素的快速测定钴白合金中钴、铜、铁、镍和锰含量的分析方法。与X-荧光光谱法对照结果表明,测试结果令人满意。     

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。     

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。     

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%.     

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.     

塔设备改造选型的分析

就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后，着重介绍一种新型塔板（导向梯形浮阀塔板）和一种新型填料（波环填料——乾隆帕克）。     

Effect of degree of deacetylation of chitin on the properties of chitin crystallites

In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997