氯硅烷的气相色谱分析

采用涂邻苯二甲酸二乙酯的气相色谱柱对用化学气相沉积法制备ＳｉＣ纤维的主要原料——氯硅烷直接进样分析,在较短的时间内即可得知每批原料的差异。实验表明,方法操作简便、快速,重复性和精密度较好,重复６次的变异系数均＜１％。可用于ＳｉＣ纤维原料的质量监测。     

芳香植物精油气相色谱分析进展

介绍了分析研究芳香植物精油所采用的气相色谱技术的新进展,包括气相色谱固定相、联用技术和多维气相色谱法,样品的提取和进样技术。     

水稻中丁草胺残留量的气相色谱分析

本文介绍了丁草胺在水稻中(包括糙米、谷糠和稻草)残留量的分析方法。样品中残留的丁草胺可分别用纯石油醚或丙酮/石油醚混合溶剂提取,经柱色谱预净化,由GC-ECD检测定量。糙米、谷糠和稻草样丁草胺的最低检测浓度分别为3 ppb、6 ppb和6 ppb。丁草胺在0.31 ppm、0.62ppm及1.24ppm标准液添加浓度下,糙米中回收率(X±Sx%)分别为89.5±1.8%、90.3±4.2%和92.4±2.1%,谷糠中回收率分别为80.8±1.9%、81.2±3.4%和87.4±6.1%;稻草样回收率分别为85.0±4.2%、84.3±4.5%和90.4±6.8%。     

3-羟基丁酸的气相色谱分析

采用ＢＦ３－ＣＨ３ＯＨ酯化衍生法,以正辛酸作内标,建立了３－羟基丁酸、巴豆酸、３羟基丁醛、巴豆醛等混合体系中３－羟基丁酸的气相色谱分析方法,利用标准样对照并结合质谱分析确定了化学合成３－羟基丁酸反应混合物的组成。该法线性范围为０．４０～１６０．６７ｇ／Ｌ,相关系数为ｒ＝０．９９９５。方法快速、简单、重现性好,并用于化学合成３－羟基丁酸反应混合物的分析,结果令人满意。     

哌嗪及其共生物的气相色谱分析研究

研究了哌嗪及其共生物的气相色谱分析方法。采用Chromsorb WAW（60～80目）为担体,以氢氧化钾作减尾剂,聚乙二醇（PEG 2万）作固定液,在长 1.5m的玻璃填充柱上哌嗪及其共生物得到良好的分离。除乙二胺外,其他相对误差均小于2％。并且计算了哌嗪及其共生物的得率和原料的转化率。     

水中丙溴磷的富集及气相色谱分析

采用ＧＤＸ－５０１吸附剂富集水中痕量丙溴磷,然后用气相色谱法直接测定,方法简便、准确,实用。水中丙溴磷的检出限为０．４μｇ／Ｌ,低、中、高３种浓度的平均加标回收率为８８．６％－９９．３％,相对标准偏差在３．２３％－４．９６％范围内。     

水中雌激素的毛细管气相色谱分析

水中天然(雌二醇,雌酮,雌三醇)与合成(炔诺酮,炔雌醇 )的环境雌激素经固相萃取柱浓缩净化,用二氯甲烷洗脱,经N,O 双(三甲基硅烷基)三氟乙酰胺(含 1%三甲基氯硅烷)衍生化后用气相色谱法进行测定.方法检出限在 8. 25~8. 99ng/L,相对标准偏差为 2. 1% ~8. 5%,加标回收率除炔雌醇较低外,其余均大于 80%.     

气相色谱法分析碳酸甘油酯

采用气相色谱法测定碳酸甘油酯粗产品中碳酸甘油酯和残余甘油的含量。选择HP1701毛细管柱,程序升温及四甘醇内标物作为色谱条件,在此条件下碳酸甘油酯和残余甘油能很好地分离。碳酸甘油酯和甘油的线性范围分别为23.30～116.6 g.L-1和3.70～18.40 g.L-1。方法的回收率在99.1%～100.9%之间,相对标准偏差(n=6)在0.61%～1.93%之间。     

固相微萃取-气相色谱联用技术在环境分析中的应用

本文综述了近5年来固相微萃取-气相色谱(SPME-GC)联用技术在环境分析中的应用进展.具体介绍了它在多环芳烃、苯系物、酚类化合物、农药、杂环化合物以及其他有机挥发物分析中的应用.引用文献158篇.     

气相色谱分析电合成法制备对氟苯甲醛

研究了对氟苯甲醛的气相色谱分析条件，选用8%OV-210为固定相测定对氟苯甲醛的含量。方法的标准偏差小于1%，回收率为100.9%～103.3%，方法快速、准确，适合于对氟苯甲醛合成工艺中的产品分析。     

十二烷基苯磺酸镁作为气相色谱固定相分析有机羧酸

用实验室合成的十二烷基苯磺酸镁配成固定相,以汞塞动态法涂柱制备了毛细管柱(固定液质量浓度为95g/L,柱尺寸为25 m×0.32 mm i.d.)所用溶剂为丙酮,并对柱性能进行了考察。实验表明这种色谱固定相对有机羧酸有独特的分离能力,出峰快,峰形窄而对称,即使对痕量的羧酸也可不经衍生直接进样定量分析。     

The true physical meaning of the corrected retention volumes in GC

Summary Through a straightforward mathematical derivation it is shown that the compressibility correction factor equals the ratio of gas pressure at the column outlet to the average pressure in the column, . Therefore, by multiplying by this factor, the experimentally measured retention volumes can be recalculated to the average pressure in the column. Corrected retention volumes thus represent the volume of the mobile phase under real conditions of chromatography in the column. Appropriate definitions for corrected retention volumes and factorj are formulated.     

Optimization of the Extraction and Analysis of Natural Androgen Steroids and Their Metabolites in Urine by GC/MS and GC/FID

A multiresidue method was developed for screening, quantification, and confirmation of nine natural androgen steroids and their metabolites in urine. Steroids were first extracted from urine by solid phase extraction, enzymatically deglucuronated, re-extracted using a liquid/liquid extraction for purification, and finally acetylated for GC/MS and GC/FID analysis. Each step of sample preparation, as well as analysis, was optimized: solid phase extraction, liquid/ liquid extraction, and derivatization reaction … Therefore, a rugged sample preparation procedure was developed leading to extracts of sufficient purity (recoveries >66% and few matrix compounds). The whole methodology allowed reliable detection and quantification of the nine steroids at low concentration levels. Linearity and repeatability were established and were found to be satisfactory (R² > 0.996, RSD < 11%). Finally, the method was applied to quantify compounds of interest in real samples collected from healthy volunteers and patients treated with 4-androstenedione or dehydroepiandrosterone.     

Analysis of turkish lignite tar by coupled LC/GC,GC/MS,and capillary SFC

This work describes the analysis of a pyrolysis product of a lignite sample obtained from the Turkish Goynuk reserve. The aliphatic, aromatic and polar compounds present in the tar are separated and identified by various chromatographic techniques: Capillary gas chromatography/mass spectrometry (GC/MS), on-line high performance microbore liquid chromatography/capillary gas chromatography (LC/GC) and capillary supercritical fluid chromatography (SFC). The suitability of each technique for this particular application is discussed, and semi-quantitative results are presented for the major components detected.     

气相色谱法测定合成气中硫化合物

建立了气相色谱法测定合成气中硫化合物的方法。采用能自动进样的六通阀和对硫磷有选择性的FPD检测器,色谱峰面积与硫化合物含量存在很好的双对数线性关系。对H2S,COS及CS2三种气体的线性相关系数依次为0．9995,0．9997及0．9997。     

气相色谱法测邻氰基苄基氯

采用GC／MS法检测出邻氰堪苄基氯中的杂质组分，并使用萘做内标物进行气相色谱法对邻氰堪苄基氯的定量检测。