作业场所空气中樟脑的气相色谱测定方法

使用ＦＦＡＰ加磷酸减尾剂色谱柱，测定作业场所中的樟脑。空气中樟脑用活性炭管采集，二硫化碳解吸，气相色谱氢火焰离子化检测器检测。本方法检出限为２．４ｍｇ／Ｌ，标准曲线线性范围（５～１００）ｍｇ／Ｌ，相对标准偏差均在１０％以下，相关系数为０．９９９９，解吸效率在９４．８％以上，样品可在室温保存１４天，采样效率为１００％。樟脑与萘、对二氯苯共存时，在本实验条件下能较好的分离，不干扰樟脑的测定。     

新型气凝胶复合材料在舰船上的 应用实践与前景

文章系统研究了新型气凝胶复合材料在舰船上的应用,通过与传统保温材料矿物棉等的对比,发现该材料不仅具有更好的隔热性能,并且在耐温、防火、环保、使用寿命等方面均不同程度地超过传统材料。另外,该材料在减重、降温等方面也具有明显优势。     

气相色谱法测定烟道气组成

研究了用HP6890N型气相色谱仪分析烟道气的方法.通过阀的切换使样品流过不同的色谱柱,从而达到一次进样就能对烟道气中各组分进行自动分析的目的.利用标准样品获得各组分相对校正因子,采用外标法定量.一氧化碳的检测下限为0.05%,氧气的检测下限为0.1%,二氧化碳的检测下限为0.1%.     

Comparative analysis of essential oils found in Rhizomes Curcumae and Radix Curcumae by gas chromatography-mass spectrometry

A comparison of the volatile compounds in Rhizomes Curcumae （Ezhu） and Radix Curcumae （Yujin） was undertaken using gas chromatography mass spectrometi-y （GC-MS）. Ultrasonic extraction and GC-MS methods were developed for the simultaneous determination of five sesquiterpenes, namely, α-pinene, β-elemene, curcumol, germacrone and curdione, in Ezhu and Yunjin. Good linearity （r〉0.999） and high inter-day precision were observed over the investigated concentration ranges. The validated method was successfully used for the simultaneous determination of five sesquiterpenes in Ezhu and Yujin. The quantitative method can be effectively used to evaluate and monitor the quality of Chinese curcuma in clinical use.     

聚合物改性沥青再生结合料微观分析

聚合物改性沥青混合料的回收再利用,对节约能源和保护环境具有重要意义。通过高压搅拌法从废旧混合料中提取沥青结合料,对比再生改性沥青(RPMAC)与室内老化改性沥青特性之间的差异,分别将现场与室内两种老化结合料按不同比例加入新制改性沥青(PMAC)中,通过傅立叶光谱试验(Fourier Transform Infrared,FTIR)分析聚合物改性对沥青氧化老化的影响;用凝胶渗透色谱试验(Gel Permeation Chromatograph,GPC)分析长期老化过程中沥青组分分子量的变化情况;用差示扫描量热试验(Differential Scanning Calorimet-ric,DSC)分析不同沥青蜡含量的差异。试验结果表明:加入再生改性沥青会增加沥青结合料的粘度,提高混合料的抗车辙性能,同时也会降低混合料的疲劳耐久性。     

Analysis of ganciclovir and its related substances using high performance liquid chromatography and liquid chromatography-mass spectrometry methods

Objective High performance liquid chromatography (HPLC) and liquid chromatography-mass spectrometry (LC/MS) methods were developed for the determination of ganciclovir and its related substances. Methods A Hypersil ODS2 column (4.6mm×250mm, 5μm) was used with a mobile phase of 0.02M potassium 1.0mL/min, and UV detector set at 254nm was used for monitoring the eluents. Results The method was simple, rapid, selective and capable of separating all related substances at trace level with a detection limit of 0.04μg/mL. It has been validated with respect to accuracy, precision, linearity, and limits of detection and quantification. The linearity range was 10.2-153.0μg/mL with r=0.9998. The percentage recoveries ranged from 96.7% to 101.6%, and RSD was 1.24%-1.96% (n=5). Conclusion The method was found to be suitable not only for monitoring the reactions during the process development but also for quality control of ganciclovir. For identification of related substances, LC/MS was used. The mainly related substances of ganciclovir active pharmaceutical ingredients (API) were determined as guanine, (1, 3-dioxolan-4-yl) methyl acetate, and diacetyl guanine.     

复合纳米二氧化钛的制备及光催化降解罗丹明B

以Ti(OC4H9)4和Si(OC2H5)4为原料,采用溶胶-凝胶法制备纳米TiO2-SiO2复合材料.通过光催化降解罗丹明B实验,确定制备纳米TiO2-SiO2复合材料的最佳条件,即Ti:Si=1:0.5,煅烧温度为500℃,制备溶胶pH取5～6.通过SEM测试,发现纳米复合材料的基本粒子为分散均匀的球形颗粒状结构;XRD分析结果表明,复合材料中TiO2主要以锐钛矿晶型存在,颗粒粒径在10～30 nm.光催化降解实验表明,按照最佳条件制备纳米TiO2-SiO2复合材料的光催化降解效果较好,在日光照射90min后,对罗丹明B的降解率可以达到100%.     

低粘度环氧树脂的性能分析

采用气相色谱-质谱法分析了两种低粘度环氧树脂的成分。分析结果表明,两种环氧树脂及其固化剂的基本组成较为一致,说明两种树脂的主体配方相似,只是个别组分存在差异。有关力学性能测试的结果表明这两种树脂的性能相当：I号树脂的韧性好于II号树脂,ll号树脂的耐热性能略好于I号树脂,由树脂的粘度一时间曲线看出两者的升温速率相当,II号树脂的初始粘度略低。