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为解决检定变压器油中溶解气体分析专用气相色谱仪时遇到样品进样量计算不准,检测器对甲烷气体标准物质无响应,专用软件分析方法不能更改等问题,建立变压器油中溶解气体分析专用气相色谱仪的检定与校准方法。当进样模式为一次进样双柱分流时,按分流比计算分流到检测器的样品体积,其它进样模式按进样体积计算进样量;因色谱软件禁止积分导致CH_4在热导检测器上无响应时,应采用有证标准物质中的H_2或O_2进行检定与校准。以7890B型专用气相色谱仪为例,详细说明了变压器油中溶解气体分析专用气相色谱仪的检定与校准流程。该法为检定人员检定该类专用仪器时提供了参考。 相似文献
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对酒类分析专用柱气相色谱仪校准用标准物质进行了研究.分别用乙醇中甲醇、乙醇中叔戊醇和甲苯中苯标准溶液校准配有酒类分析专用聚乙二醇石英毛细管柱的气相色谱仪,色谱峰面积相对标准偏差、检出限均满足检定校准技术要求.乙醇中甲醇标准溶液的色谱峰对称性差,甲苯中苯标准溶液的色谱响应值最低.乙醇中叔戊醇标准溶液是理想的聚乙二醇酒类分... 相似文献
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气相色谱仪检定结果的不确定度评定 总被引:2,自引:0,他引:2
气相色谱仪检定结果的不确定度主要来源于流速稳定性、柱箱温度稳定性、基线噪声、定量重复性和标准物质进样量的不确定度。以TCD检测器为例进行分析,对气相色谱仪检定结果的不确定度进行评定,相对扩展不确定度为5%。 相似文献
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气相色谱柱是气相色谱仪的关键部件,主要用于混合气体组分的分离。与传统气相色谱柱相比,基于微机电系统(MEMS)技术设计制作的微型气相色谱柱具有重量轻、体积小、功耗低、分离快速等优点,便于集成到便携式气相色谱仪中,适应了目前气相色谱仪微型化的发展趋势。该文综述了MEMS微型气相色谱柱的研究进展,首先阐述了MEMS微型气相色谱柱理论基础,随后对MEMS微型气相色谱柱沟道布局及柱内结构、固定相支撑层及固定相制备等方面进行了综述,最后对其发展趋势进行了展望。 相似文献
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为了保证天然气工业用气相色谱仪分析结果准确可靠和量值溯源有效,依据JJG 1055—2009《在线气相色谱仪》、JJF1033—2016《计量标准考核规范》等规程规范要求,配置建标所需计量标准器,研究开展了重复性试验、不确定度评定、检定结果的验证等工作,建立了天然气气相色谱仪检定装置,通过了国家市场监督管理总局的现场考... 相似文献
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为进一步增强气相色谱仪检定规程的合理性,对JJG 700-1999规程的适用性进行了分析,明确了规程修订的目的和意义,并对需要修改的项目及内容进行了研讨. 相似文献
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气相色谱法检测大气中N2O浓度 总被引:14,自引:0,他引:14
由于受大气中O2、H2O和氯氟烃的干扰,大气中的N2O难于用简单的气相色谱法连续观测。实验中对带有电子捕获检测器的气相色谱仪(G-ECD)进行了改进,系统中安装了10通进样反吹阀和4通切换阀,色谱系统中同时采用两根PoraPakQ填充柱,并在进样系统中安装了水蒸汽和CO2过滤吸收器。这样,干扰物不进入检测器,对N2O信号没有干扰,从而提高了N2O分析灵敏度和精确度。从1992年11月起,我们开始对北京大气N2O浓度进行长期定位测检。用这种方法测得的北京大气N2O月平均浓度介于301±9.8ppbv至335±22.5ppbv之间,平均值为317±12.8ppbv。 相似文献
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岛津GC-16A型气相色谱仪因CRT显示器控制电路故障而导致主机死机,进而造成CR-7A型数据处理机无法与主机联机而死机。通过分析故障现象和电路结构,对主机部分电路进行改造,完全拆除主机上的CRT显示器控制电路,直接通过CR-7A型数据处理机控制主机,使主机不受CRT显示器控制电路的影响而稳定地工作。经改造后,气相色谱仪工作正常,不再出现死机现象。 相似文献
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Six proficiency tests have now been completed in an ongoing program of the UK Food Analysis Performance Assessment Scheme (FAPAS) for the analysis of acrylamide in a range of food matrixes. Homogeneous test material samples were requested by laboratories throughout the world, with 29 to 45 submitting results for each test. Results were analyzed by appropriate statistical procedures, and z-scores were awarded for reported values. In the absence of both legislation and collaborative trial data, the target standard deviation was derived from the Horwitz equation, although it is acknowledged that there is a need to establish a "fit for purpose" target standard deviation specifically for acrylamide analysis. Participants were encouraged to use the analytical method routinely used in their own laboratory and to provide details of their procedure. Close examination of the data submitted indicates that performance is generally acceptable in terms of accuracy. There is no significant difference between results submitted by gas chromatography and liquid chromatography (GC and LC) methods, and no method dependency on the use of internal standards or sample size. However, choice of extraction solvent may be important, with indications that plain water is an acceptable extraction method. There is evidence from the most recent test that direct (underivatized) GC methodology may present problems, but more data are required and this aspect will be monitored in the continuing proficiency testing program. 相似文献
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近两年国内气相色谱的进展 总被引:1,自引:0,他引:1
对近两年国内学者对气相色谱(GC)的研究和应用进行了综述.GC已经是一门十分成熟和广泛应用的分析技术,近两年国内学者的研究发展近似于国外的GC研究和发展,基础性GC研究不多,大多为GC在各个领域的应用研究.应用研究包括在食品、中药、水、气、石油、石化、工业品、农残和烟草分析中的应用. 相似文献
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Jianwei Wang 《Talanta》2010,82(3):1022-1026
A micro-flame ionization detector (μ-FID) for portable gas chromatograph (GC) based on conventional mechanical fabrication techniques was developed and evaluated. Structure was redesigned and dimensions were optimized for best performance. Air is introduced from upper part of the detector, flowing downwards into the burning chamber along a narrow round gap between the collection electrode and the inner wall of the detector body, forming a uniform flow field around the burning jet. The lowest detection limit of the μ-FID was 5 × 10−13 g/s for n-decane, with a linear response range of five orders of magnitude. The consumption of gases is only 10 ml/min for hydrogen, and 120 ml/min for air, that is about 1/3 of the gases required for conventional FIDs. A comparative study between the μ-FID and commercial FID was also performed that proved the advantages of the μ-FID. The μ-FID is simple in structure, low heating power, and low consumption of gases that not only decrease the cost of running, but also increase the portability of GC for filed applications. 相似文献
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为保障海上平台安全生产,采用便携式色谱仪对海上平台天然气中氮气进行分析.便携式色谱仪利用气相色谱原理能够准确分析产出气体组成.仪器检测数据精度高,检测速度快,单个样品检测时间为4 min,可连续工作时间为8 h.现场检测表明便携式色谱仪具有操作简单、快速等特点,对快速判定气体成分显示出一定的优越性,为海上油气田天然气中氮气快速检测提供技术支持. 相似文献
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A commercially available atomic emission detector coupled to a capillary column-containing gas chromatograph (;GC/AE) was utilized to detect organotin compounds. The response for tin was found to be dependent on the flow rate of the make-up gas. At flow rates of 174 cm3 min?1, 6 × 10?12 g of tin could be detected. Lower flow rates decreased the sensitivity. Response curves for two different pressures were established and both plots exhibited curvature at low concentrations. Extracted fish and sediment samples were analysed on the GC/AE system. The technique is element-specific. The presence of tin compounds could be confirmed by examining the emission spectra taken at the retention time of the peak. 相似文献