Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement
An assessment of the sensitivities of the critical parameters in the ASTM D6423 documentary standard method for the measurement of pHe in (bio)ethanol has been undertaken. Repeatability of measurements made using the same glass electrode and reproducibility between different glass electrodes have be...
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| Format: | Article |
| Language: | English |
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MDPI AG
2010-11-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/10/11/9982/ |
| _version_ | 1828117641849470976 |
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| author | Paul J. Brewer Richard J. C. Brown Adam C. Keates |
| author_facet | Paul J. Brewer Richard J. C. Brown Adam C. Keates |
| author_sort | Paul J. Brewer |
| collection | DOAJ |
| description | An assessment of the sensitivities of the critical parameters in the ASTM D6423 documentary standard method for the measurement of pHe in (bio)ethanol has been undertaken. Repeatability of measurements made using the same glass electrode and reproducibility between different glass electrodes have been identified as the main contributors to the uncertainty of the values produced. Strategies to reduce the uncertainty of the measurement have been identified and tested. Both increasing the time after which the pHe measurement is made following immersion in the sample, and rinsing the glass electrode with ethanol prior to immersion in the sample, have been shown to be effective in reducing the uncertainty of the numerical value produced. However, it is acknowledged that the values produced using these modified approaches may not be directly compared with those obtained using the documentary ASTM method since pHe is defined operationally by the process used to measure it. |
| first_indexed | 2024-04-11T13:17:41Z |
| format | Article |
| id | doaj.art-03f244fb771247f4b01db1768d573f7b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:17:41Z |
| publishDate | 2010-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-03f244fb771247f4b01db1768d573f7b2022-12-22T04:22:19ZengMDPI AGSensors1424-82202010-11-0110119982999310.3390/s101109982Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for ImprovementPaul J. BrewerRichard J. C. BrownAdam C. KeatesAn assessment of the sensitivities of the critical parameters in the ASTM D6423 documentary standard method for the measurement of pHe in (bio)ethanol has been undertaken. Repeatability of measurements made using the same glass electrode and reproducibility between different glass electrodes have been identified as the main contributors to the uncertainty of the values produced. Strategies to reduce the uncertainty of the measurement have been identified and tested. Both increasing the time after which the pHe measurement is made following immersion in the sample, and rinsing the glass electrode with ethanol prior to immersion in the sample, have been shown to be effective in reducing the uncertainty of the numerical value produced. However, it is acknowledged that the values produced using these modified approaches may not be directly compared with those obtained using the documentary ASTM method since pHe is defined operationally by the process used to measure it.http://www.mdpi.com/1424-8220/10/11/9982/pHeethanolbiofuelsuncertaintystandard methods |
| spellingShingle | Paul J. Brewer Richard J. C. Brown Adam C. Keates Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement Sensors pHe ethanol biofuels uncertainty standard methods |
| title | Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement |
| title_full | Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement |
| title_fullStr | Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement |
| title_full_unstemmed | Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement |
| title_short | Sensitivities of a Standard Test Method for the Determination of the pHe of Bioethanol and Suggestions for Improvement |
| title_sort | sensitivities of a standard test method for the determination of the phe of bioethanol and suggestions for improvement |
| topic | pHe ethanol biofuels uncertainty standard methods |
| url | http://www.mdpi.com/1424-8220/10/11/9982/ |
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