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• W2071469884 abstract "The verification certified reference material about thermal conductivity detector (TCD) of gas chromatograph was studied and the preparation was introduced. This article in detail introduced uniformity, stability assessment of certified reference material and analyzed the uncertainty evaluation. The result was up to the requirement of JJG 700-1999 Verification Regulation of gas chromatograph. Introduction Huge numbers of GC analytical instruments were used in food, environmental protection and chemical engineering. The traceability of value of a quantity of certified reference material (CRM) of benzene in toluene about TCD-JJG 700-1999 Verification Regulation of gas chromatograph was widely used in measure system. The article put forwards on the study of CRM of benzene in toluene, raw material-selecting, the measurement method of characteristic value, the preparation, uniformity, stability and fixed value of CRM. The intercomparison of reference material were certified by National Institute of Metrology laboratory, which indicating reference material with good performance could be used as quantity transmission, evaluation on calibration and verification of TCD analysis and quality control . (1)Reagents and devices 1)Benzene: GBW06104a, Tianjin Institute of Measurement Technology,purity:99.91%, relative uncertainty:±0.03%. 2)Toluene: TEDIA,USA, purity:99.8%. 3)Electronic balance:Sartorius,25mg, 0.01 mg. 4)250 mL volumetric flask. (2)Preparation The concentration of standard solution was 5.00mg/mL through precisely weighing 1251mg benzene on the electronic balance under the 20°C±4°C condition. The constant volume was 250mL with toluene and mixed completely. Homogeneity examination of standard solution (1)Homogeneity examination Shake up the standard solution could eliminate in homogeneity of within-bottle.According to ISO Guide35, uniformity of the reference material was evaluated by uncertainty of in homogeneity and variance analysis was used to verify homogeneity. If the statistical test of data had no significant difference under repeatability condition, statistics less than critical value (Fs<Fc), the distribution of characteristic values measured in the sample was homogeneous. (2)Process of homogeneity examination Instruments: gas chromatograph Agilent7890, US13231022.Conditions: column:HP-5 5% (Agilent), 30m×0.32mm×0.25μm,injection volume:1μL,split ratio:10:1,injector:120 °C ,column flow:1.5 mL/min, oven: 45°C, keep 10minutes; detector:160°C. 15 bottles were randomly selected from 200 bottles which were used to test of homogeneity and International Conference on Materials, Environmental and Biological Engineering (MEBE 2015) © 2015. The authors Published by Atlantis Press 351 compared with GBW(E)130101. (3)The result of homogeneity examination The result was listed in table 1. Table 1 homogeneity data of benzene in toluene (mg/mL) No. 1 2 3 4 1 4.98 4.98 5.01 4.98 2 4.96 4.97 5.02 5.00 3 5.00 4.99 5.05 5.04 4 4.97 4.97 5.00 5.01 5 5.04 4.98 5.01 4.97 6 4.98 5.03 5.10 5.00 7 4.93 5.02 5.01 4.97 8 5.02 5.02 4.98 5.01 9 5.01 4.99 4.99 5.02 10 5.03 5.04 5.07 5.02 11 5.03 4.97 5.02 4.90 12 4.92 4.94 4.98 5.00 13 5.02 5.02 4.99 5.03 14 4.99 4.99 5.04 5.00 15 5.00 5.01 5.04 5.01 F(14,45)=1.75<F0.05(14,45)=1.91 The certified reference material of benzene in toluene was homogeneity and the uncertainty of homogeneity was added to total uncertainty. Stability examination of standard solution (1) The method of stability examination In different time, the relationship between time and value was described to evaluate stability. Uncertainty about intercept:" @default.
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• W2071469884 date "2015-01-01" @default.
• W2071469884 modified "2023-09-23" @default.
• W2071469884 title "Research on certified reference material of benzene in toluene" @default.
• W2071469884 doi "https://doi.org/10.2991/mebe-15.2015.83" @default.
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