气相色谱专家系统的进展

综述了国家色谱研究分析中心在气相色谱专家系统方面的进展,着重于色谱分离模式的推荐、气相色谱柱系统的推荐、气相色谱操作条件的最佳化、气相色谱在线定性定量分析四个方面;列举了在石化部门和环境监测中气相色谱专家系统应用的大量成功实例,以说明软件的实用性。     

国内气相色谱近年的进展

本文对近三年国内学者在气相色谱方面的研究和应用作了综述 ,国内学者的研究基本和国际上气相色谱方面的研究类似 ,在全二维气相色谱、快速气相色谱 ,微型气相色谱仪、新型气相色谱固定相和色谱柱的溶胶 凝胶涂渍技术领域的研究方面作出了贡献。有关气相色谱的应用研究中 ,介绍了大量在药物分析、食品分析、环境分析、石油和石化分析和化工产品及高聚物分析等领域中应用的题目和摘要     

气相色谱—四温裂解气相色谱联用分析

本文利用气相色谱—四温裂解气相色谱联用仪对一些混合物作定性分析,此方法可用来作气相色谱难分离物质的鉴定。     

以金属有机框架材料HKUST-1为固定相的微型气相色谱柱

气相色谱柱微型化有利于气相色谱系统的小型化,然而对微型气相色谱柱而言,轻烃的分离是一个挑战。本研究基于微机电系统（MEMS）技术制备了微型气相色谱柱,在室温下合成了一种金属有机框架材料HKUST-1,采用动态涂敷法将HKUST-1涂敷到微型气相色谱柱中作为固定相。对以HKUST-1为固定相的微型气相色谱柱进行分离测试,结果表明,此微型气相色谱柱可以完全分离轻烃混合物（甲烷、乙烷、丙烷和正丁烷）,其中难以分离的甲烷和乙烷的分离度达到9.2。     

近期微型色谱硬件研究亮点

1微机电谐振气相色谱检测器 2高灵敏表面离子化气相色谱检测器 3微型化低功耗的二维气相色谱聚焦调制器 4阵列微柱体式芯片液相色谱柱     

近几年国内外气相色谱固定相的进展

最近几年气相色谱的进展放缓,但是气相色谱固定相的发展有所突破,即室温离子液体的研究和商品化;金属有机框架化合物用于气相色谱固定相的研究有很大进展;碳纳米管作气相色谱固定相的研究也所发展。本文将对近年国内外这3个方面气相色谱柱(固定相)的进展作一综述评论。     

近两年国内气相色谱的应用进展(Ⅲ)

对近两年国内各个领域的学者在气相色谱方面的研究和应用作了综述,本综述分3部分叙述,本篇为第 部分,包括:8.气相色谱在食品功效成分和其他成分分析中的应用,9.气相色谱酒分析中的应用,1 0 .气相色谱在污染物分析中的应用,1 1 .气相色谱在石油、石油化工分析中的应用,1 2 .气相色谱在化学品生产分析中的应用     

气相色谱一四温裂解气相色谱联用仪

本文用四个并联的蒸气相裂解器在气相色谱—裂解气相色谱联用装置,四个裂解器的温度为406.554,658及768℃,解决了实用的气相色谱—裂解气相色谱联用分析要求有普遍适用的裂解温度的问题,同时得到较多较大的裂解色谱峰,使定性更加准确。     

一种香精的气相色谱—裂解气相色谱联用分析方法

讨论了裂解二次反应对气相色谱—裂解气相色谱联用定性分析起的作用,改进了气相色谱—裂解气相色谱联用装置,对7组分的香精作定性分析,研究了多种实验条件与定性参数的关系,提出可用一组裂解色谱参数作为实用的主要定性依据,另一组参数作为辅助依据。     

《气相色谱方法及应用》（第二版）

该书重点介绍了气相色谱的分析方法、常用技术和应用。内容涉及了气相色谱的基本原理、仪器的结构和操作方法及气相色谱的新发展和新技术。该书是《色谱技术丛书》之分册,在第一版基础上作了修改和充实,力求实用性、新颖性和典型性。例如,第四章集中介绍了气相色谱的各种进样技     

借多波长量测数据测定二元配合物组成

本文提出利用多波长量测数据测定二元配合物组成的新方法。首先以线性最小二乘求得各吸收组分吸收系数；继而应用多元线性回归获取各组分平衡浓度并据物料平衡求得配合物组成比及稳定常数。运用单纯形方法对５个体系测定结果进行了检验。     

大洋底多金属结核样品中主、次、微量元素的X射线荧光光谱测定

制定了一个用X射线荧光光谱法测定大洋底多金属结核样品中主、次、微量元素的分析方法。样品用石墨坩埚、混合熔剂低倍稀释熔融,用人工标样作为校准标准。计算了COLA方程的理论α系数,用于校正28个分析元素的吸收-增强效应。本法测定结果与化学法结果相吻合。     

A model calculation of protonic mobility in ice

The protonic conductivity in ice crystals is considered within the framework of strong coupling developed earlier by the present authors for semiconductors with narrow bands and strong coupling of electrons with phonons. The generalization for a two-band model is developed. The model used is the one described by Gosar and Pintar, the principal feature of which is the concept of the protonic conduction bands. The analytical expression for the protonic mobility is given. The results of the theory are in qualitative agreement with the experimental data.     

X射线荧光光谱法测定催化原料高岭土化学成分的研究

采用LiBO2熔样,X射线荧光光谱仪测定了高岭土的化学组成,结果表明,测定值与化学法及推荐值相符,重复测定高岭土主、次量组分的相对标准偏差小于0.83%,方法简便快捷,分析时间仅为传统湿法化学分析的1/8,应用于高岭土的测定,结果满意。     

Matrix modification--the use of protein-free solutions in the determination of metals in blood by flame atomic fluorescence and emission spectrometry

A procedure is described for matrix modification in the determination of metals in blood by flame spectrometric methods. The protein is removed by precipitation with dilute nitric acid and centrifugation and the supernatant liquid is used for direct analysis. Nitric acid is compared with other acids as the precipitant. The technique is simple, contamination-free and provides a solution which may be directly compared with aqueous calibration standards. Its application for determination of clinically important metals by flame atomic fluorescence and emission spectrometry is demonstrated.     

The determination of bromide,chloride and lead in airborne particulate matter by stripping voltammetry

Cathodic and anodic stripping voltammetry are proposed for the simultaneous determination of chloride, bromide and lead in atmospheric particulate matter. Particulate matter collected on Nucleopore membrane filters with high-volume pumps is digested in a dilute nitric acid wash at elevated temperature and pressure for 1 h. The sample is then removed to the electrochemical cell and analyzed directly for chloride and bromide by cathodic stripping and for lead by anodic stripping. The total amount of halide is first determined and then, by changing the deposition potential, the amount of bromide only is determined. The chloride is found indirectly by difference. Analysis time for the three elements is approximately 20 min beginning with a prepared sample.     

Determination of molybdenum and tungsten at trace levels in rocks and minerals by solvent extraction and X-ray fluorescence spectrometry

Separation by solvent extraction followed by X-ray fluorescence spectrometry has been used for determination of molybdenum and tungsten in rocks and minerals. Samples are decomposed either by heating with a mixture of hydrofluoric acid and perchloric acid or by fusion with potassium pyrosulphate, followed by extraction of molybdenum and tungsten with N-benzoylphenylhydroxylamine in toluene from 4-5M sulphuric acid medium. The extract is collected on a mass of cellulose powder, which is dried in vacuum, mixed thoroughly and pressed into a disc for XRF measurements. The method is free from all matrix effects and needs no mathematical corrections for interelement effects. The method is suitable for determination of molybdenum and tungsten in geological materials down to ppm levels, with reasonable precision and accuracy.     

Influence of the particle size distribution on the CRTA curves for the solid-state reactions of interface shrinkage type

The kinetic curves at infinite temperature for the solid-state reactions of the interface shrinkage type were drawn theoretically by taking account the particle size distribution in the sample mixture. The CRTA curves for the reactions with the particle size distribution can be drawn by utilizing the universal kinetic curves at infinite temperature. The proper kinetic treatment for the CRTA curves with the particle size distribution is discussed in connection with the property of the kinetic equation with respect to the particle size distribution. The present kinetic consideration is taken as a simulation for the reactions with a certain distribution in among the reactant particles, produced preferably by the mass and heat transfer phenomena during the thermoanalytical measurements. The merit of the rate jump method by a single cyclic CRTA curve is also discussed on the basis of the present results.     

紫外分光光度法测定蔬菜鲜样中的硝酸盐

建立了紫外分光光度法测定蔬菜鲜样中硝酸盐含量的方法，经t检验证明，该方法的测定结果与酚二磺酸法无显著性差异，RSD小于4．5％，方法操作简便，适用于蔬菜中硝酸盐含量的测定。     

Simultaneous determination of residues of chloramphenicol,thiamphenicol, florfenicol,and florfenicol amine in farmed aquatic species by liquid chromatography/mass spectrometry

A liquid chromatographic (LC)/mass spectrometric (MS) method was developed for determining the residues of chloramphenicol, thiamphenicol, florfenicol, and florfenicol amine in a number of aquatic species. The phenicols are extracted with acetone, the extracts are partitioned with dichloromethane, the aqueous layer is removed, and the organic layer is evaporated to dryness. The residue is dissolved in dilute acid and defatted with hexane, and the aqueous layer is prepared for analysis by LC. The phenicols are determined by reversed-phase LC by using a Hypersil C18-BD column with a water-acetonitrile gradient and MS detection using selected-ion recording. Calibration curves were linear for all analytes between 0.015 and 0.425 ng injected. The relative standard deviations for measurements by the proposed method were < 10% for all of the analytes studied, with recoveries ranging from 71% for florfenicol amine to 107% for florfenicol in salmon tissue spiked at the 2 ng/g level. Detection limits of 0.1 ng/g for florfenicol and chloramphenicol, 0.3 ng/g for thiamphenicol, and 1.0 ng/g for florfenicol amine are easily obtainable. The operational errors, interferences, and recoveries for spiked samples compare favorably with those obtained by established LC methodology. The proposed method is simple, rapid, and specific for monitoring residues of chloramphenicol, thiamphenicol, florfenicol, and florfenicol amine in a number of aquatic species.