气相色谱仪期间核查实施两例

依据《气相色谱仪检定规程》结合实验室条件和具体仪器特点对不同厂家不同型号的两种气相色谱仪进行了期间核查,方法可靠实用,简单易行,维持了检测结果的可信度。     

HS-SPME-GC法测定水中典型嗅味物质

研究了气相色谱仪（GC）测定水中典型噢味物质（土臭素、2-甲基异茨醇、2-甲氧基-3-异丙基吡啶、2-甲氧基-3-并丁基吡嗪和2，4，6-三氯苯甲醚）的改进方法。采用新型顶空-固相微萃取（head-space solid-phase microextraction，HS—SPME）方法对水样进行前期富集处理，然后利用气相色谱氢离子火焰检测器（FID）进行测定。在优化试验条件下对嗅味物质的测定结果显示，5种嗅味物质的峰面积与其浓度有较好的相关性，其相关系数〉0．87；该方法对5种嗅味物质的检出限值较低，其中对土臭素的检出限为0．4ng/L。改进后的测定方法适用于气相色谱仪，操作简单省时，对于推广嗅味物质的检测具有重要的实际意义。     

气相色谱仪的使用及常见故障处理

总结使用毛细管色谱柱的气相色谱仪的使用经验及故障处理,并以上分GC122气相色谱仪分离及检测系统的故障为实例进行分析说明。     

室内环境检测实验室气相色谱仪的期间核查

气相色谱仪检定期间的量值的准确性是出具检测结果的保证.通过对气相色谱仪检定后初期和有效期中期分别进样,对两次结果进行统计分析,看是否具有显著性差异.     

室内空气中TVOC检测方法的探索与研究

根据《民用建筑工程室内环境污染控制规范》,对室内空气中总挥发性有机物(TVOC)的气相色谱进行了分析,研究了吸附管、载气、气相色谱仪等对TVOC测定结果的影响,并在检测过程中进行对比、总结,以提高检测技术和手段。     

广州建设工程质量安全检测中心有限公司水、污泥等分析检测项目通过CMA计量认证

正广州建设工程质量安全检测中心有限公司于2017年4月开始筹建环境监测项目。实验室配备了一批先进的分析仪器设备,如原子吸收光谱仪、离子色谱仪、气质联用、气相色谱仪、液相色谱仪、两虫检测设备、十万分之一电子天平、pH值现场检测仪等,配备了无菌室、生化培养箱、显微镜、生物安全柜等微生物检测仪器和设施。     

气相色谱仪常见故障的分析与处理

气相色谱仪是一种对混合气体中各组分进行分析检测的仪器。在东营压气站主要用于原料气、外输干气、液化气的组分分析。色谱仪在使用一段时间后,一起的某些性能就会因为各种各样的原因偏离仪器的技术指标。因此,总结气相色谱仪故障排除的经验,用以保持仪器的高灵敏度,保证分析结果的准确性,减少故障和维修成本。     

低温微捕集-气相色谱法测定空气中苯及烷基取代苯

文章采用低温微捕集浓缩系统与气相色谱仪连接，用铝箔气袋采集空气中的苯及烷基取代苯类，经低温微捕集浓缩系统对样品进行浓缩处理，并在线注入气相色谱仪进行测定。该低温微捕集浓缩系统可对样品进行100％测定，因此测定的灵敏度增加。该方法与溶剂解吸和热解吸前处理法相比，操作简便，不需要使用有机试剂和老化吸附管，进样量的增加，降低了检出限，可实现对低含量的苯及烷基取代苯类的准确定量。     

9700热解吸仪直接进样测空气TVOC可行性实验

本文用由浙江温岭福立分析仪器有限公司制造的9700热解吸仪配套该公司的GC9790气相色谱仪,对室内污染物TVOC的检测进行了标准曲线、重复性、定量准确性大量实验,结果表明该套装置能够满足GB50325中对TVOC浓度的检测要求。     

广州建设工程质量安全检测中心有限公司水、污泥等分析检测项目通过CMA计量认证

正广州建设工程质量安全检测中心有限公司于2017年4月开始筹建环境监测项目。实验室配备了一批先进的分析仪器设备,如原子吸收光谱仪、离子色谱仪、气质联用、气相色谱仪、液相色谱仪、两虫检测设备、十万分之一电子天平、 pH值现场检测仪等,配备了无菌室、生化培养箱、显微镜、     

离子色谱法测定混凝土外加剂中的氯离子

本文探讨了离子色谱法测定混凝土外加剂中无机氯离子以及样品的前处理方法。实验中采用SEP-RP预处理柱,利用此富集柱可以有效的去除混凝土外加剂中的有机化合物,提高色谱柱效。     

超声萃取/气相色谱法测定污泥中的硝基苯

采用超声萃取/气相色谱法测定了污泥中的硝基苯含量。研究了混合溶剂的比例及用量、超声萃取时间、盐析剂投量等因素对测定结果的影响。采用该方法测定以蒸馏水和松花江水为本底制备的泥样时的平均回收率分别为91．6％～97．4％和83．4％，RSD分别为1．9％～4．4％和7．1％。该方法简便、快速，从样品预处理到检测完毕只需90min。     

毛细管色谱在放火案件鉴定中的应用

本文介绍了毛细管色谱在火灾原因鉴定中关于检测易燃液体的应用,包括毛细管色谱条件的选择、不同标号汽油的研究、汽油燃烧特性的研究等内容,为火灾原因鉴定和各地公安消防机关确定火灾性质提供技术支持。     

Microdetermination of bromide in water by gas chromatography

For the determination of micro order bromide in waters, a rapid, selective and sensitive method was studied. Bromide reacted with citric acid and potassium permanganate to form pentabromoacetone, which then turned into bromoform. The bromoform was measured by a head space gas chromatograph. The ion-exchange chromatograph (Amberlite CG-400, 10 mm i.d. × 70 mm; elutant, 0.1 M sodium nitrate, 70 ml and 0.5 M sodium nitrate, 25 ml) was applied to bromide without interfering substances such as chloride and phenols. Bromide of ppb levels in water can be accurately determined by ion-exchange chromatograph, potassium permanganate oxidation and head space gas chromatograph (ECD).     

焦炉煤气含萘量测定中快速取样方法的研究

研究出一种新的从管道煤气中快速,准确吸收等萘的取样方法,每次取样仅需２ｍｌ吸收液,耗时低于２０ｍｉｎ,所取样品可以直接用于所相色谱法测定煤气中的萘含量。     

Seasonal variations in the concentrations of ethylene,acetylene and propylene at Trombay,Bombay

Concentrations of ethylene, acetylene and propylene at Trombay, Bombay for the year 1982 are given in this paper. The method of measurement consisted of pre-concentrating the atmospheric hydrocarbons in short U-columns kept at dry ice temperature and then analysing in a gas chromatograph with a chemiluminescent detector. The data is based on 2-h samples collected daily in the forenoon and afternoon periods. A minimum concentration of 0.2 ppb of ethylene could be detected by this method. The ground level ozone concentrations at Trombay correlated with ethylene concentrations (correlation coefficient = 0.70) and with the product of ethylene and propylene (correlation coefficient = 0.40). These correlations are significant at 99.5 and 95% confidence levels respectively, and indicate that these reactive hydrocarbons contribute to ground level ozone concentrations.Measurements at Trombay showed that the concentrations of the hydrocarbons are below the air quality standards. The chemiluminescent method of detection was found to be very convenient for selective determination of ethylene and other reactive hydrocarbons.     

Analysis of TVOC and Certain Selected Compounds from Indoor Air using GC/FID-RIM Technique

A method is described for the identification and quantification of compounds emitted into indoor air. In this method we have selected certain compounds from among the many emitted by various sources to perform as standards in screening the quality of the indoor air sample. Identification and quantification of the compounds found in a sample are made with a two-channel high resolution gas chromatograph with two FIDs. Identification is based on linear retention indexes. For comparison, the TVOC of the air sample is calculated in two different ways. This method allows rapid identification and quantification of the main compounds present in indoor air if the VOC air mixture is not too complex.     

汽油的星状图比对鉴定法

用毛细管气相色谱法对一些汽油样品组分进行了分离。在得到的色谱图上,选取合适的色谱峰对,对峰高经或峰面积比求出色谱峰对的斜率参数,采用极坐标法对这些参数作图,便得到该油品的星状图,用星状图法对一些商品汽油源成功地进行了比对鉴定,结果满意。     

Air flow measurement using three tracer gases

A technique is described for measuring air flows between internal zones of houses. The theory is given for measuring one- and two-directional flows and the equipment used for practical measurements is described. The tracer gases used are Freon 12, Freon 114 and BCF. Their concentrations are measured using a gas chromatograph. Specimen results of one- and two-directional air flows between a house and its roof are included. The possible applications of the method in houses are discussed.     

燃气管网检漏中天然气与沼气的区分

采用气相色谱分析仪对管网检漏报警的可燃气体进行成分分析,确定可燃气体是天然气还是沼气,以便制定抢修方案,保证管网安全运行.