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Preparation of calibration standard gas mixtures by primary gravimetric method: a case study on 960 ?mol/mol of carbon dioxide in a nitrogen matrix |
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| รหัสดีโอไอ | |
| Creator | 1. Harry Budiman 2. Muhammad Rizky Mulyana 3. Oman Zuas |
| Title | Preparation of calibration standard gas mixtures by primary gravimetric method: a case study on 960 ?mol/mol of carbon dioxide in a nitrogen matrix |
| Publisher | Faculty of Engineering, Khon Kaen University |
| Publication Year | 2561 |
| Journal Title | Engineering and Applied Science Research |
| Journal Vol. | 45 |
| Journal No. | 3 |
| Page no. | 173-179 |
| Keyword | Carbon dioxide, Calibration standard gas mixture, Gravimetric method, Gas chromatographic, Traceability |
| URL Website | https://www.tci-thaijo.org/index.php/easr/index |
| Website title | Engineering and Applied Science Research |
| ISSN | 2539-6161 |
| Abstract | Calibration standard gas mixtures (CSGMs) are important reference standards that are necessary to achieve traceability for accurate and reliable gas measurement results. The CSGM of ~960 ?mol/mol carbon dioxide (CO2) in a nitrogen (N2) matrix as the target concentration were prepared using a gravimetric method according to ISO 6142 with one dilution step. The CSGMs of ~2.8 % mol/mol CO2 in N2 were prepared and used as pre-mixtures. Verification of the CSGMs (pre-mixtures and target concentration) was conducted using a gas chromatographic thermal conductivity detector (GC-TCD). The results indicated that both the gravimetrical value and the analyzed value of CO2 concentration where in good agreement. Excellent stability of the ~960 ?mol/mol of CO2 in N2 CSGMs was shown during storage for a specified time. Such stability was characterized by a relative low uncertainty (0.177%) that was less than the required target uncertainty (0.250%). Additionally, determination of CO2 concentration in a working standard (WS) gas mixture was done using two-point calibration and it generated higher precision than other methods. This implies that two-point calibration (bracketing technique) approach is a promising method that can be applied for quantification of the concentrations of sample gas mixtures in an international laboratory comparison held by the Asia Pacific Metrology Programme (APMP-QM-S15), and for certification of a WS. |
