Water quality monitoring is of fundamental importance for health and environmental protection. Conductivity and the total dissolved substance (TDS) are two important water quality parameters. Their monitoring requires good calibration of the measuring equipment and correct assessment of the measurement uncertainty so that the water quality limits can be well judged. Though many published research articles include conductivity and TDS measurement results, there is no published ISO GUM approach for estimation of the uncertainty in the calibration measurement results. In this work, the linearity of a conductivity meter was established using three certified reference materials (CRMs) of 100, 500 and 1410.7μS/cm and then a one-point calibration using CRM of 1410.7μS/cm was carried out. The calibration method was validated by studying its accuracy, precision and bias. The method was found fit-for-the purpose and the uncertainty sources of calibration were identified and estimated based on ISO GUM. Then a standard solution of concentration 0.01M was prepared from high purity KCl to provide conductivity of 1411μS/cm. The corresponding TDS value of this solution was found 745 mg/L and its traceability to the SI units was achieved by weighing the mass of KCl using a calibrated balance and by measuring the volume of water using a calibrated measuring flak. This solution was used to perform a one-point calibration of a TDS meter then the meter was allowed to read the TDS 10 times and the uncertainty of the measurement results was estimated based on ISO GUM. The results obtained proved a very good calibration of both meters. An overall approach for estimation of the calibration uncertainty was developed, which will be very useful in water quality monitoring measurements.
| Published in | Science Journal of Chemistry (Volume 10, Issue 6) |
| DOI | 10.11648/j.sjc.20221006.13 |
| Page(s) | 211-218 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
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Copyright © The Author(s), 2022. Published by Science Publishing Group |
Conductivity, TDS, Calibration, Method Validation, ISO GUM Uncertainty
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APA Style
Adel Bassuoni Shehata, Abdulrahman Rashed AlAskar, Rashed Abdallah Al Dosari, Fahd Refaei Al Mutairi. (2022). Calibration and ISO GUM Based Uncertainty of Conductivity and TDS Meters for Better Water Quality Monitoring. Science Journal of Chemistry, 10(6), 211-218. https://doi.org/10.11648/j.sjc.20221006.13
ACS Style
Adel Bassuoni Shehata; Abdulrahman Rashed AlAskar; Rashed Abdallah Al Dosari; Fahd Refaei Al Mutairi. Calibration and ISO GUM Based Uncertainty of Conductivity and TDS Meters for Better Water Quality Monitoring. Sci. J. Chem. 2022, 10(6), 211-218. doi: 10.11648/j.sjc.20221006.13
AMA Style
Adel Bassuoni Shehata, Abdulrahman Rashed AlAskar, Rashed Abdallah Al Dosari, Fahd Refaei Al Mutairi. Calibration and ISO GUM Based Uncertainty of Conductivity and TDS Meters for Better Water Quality Monitoring. Sci J Chem. 2022;10(6):211-218. doi: 10.11648/j.sjc.20221006.13
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Download@article{10.11648/j.sjc.20221006.13,
author = {Adel Bassuoni Shehata and Abdulrahman Rashed AlAskar and Rashed Abdallah Al Dosari and Fahd Refaei Al Mutairi},
title = {Calibration and ISO GUM Based Uncertainty of Conductivity and TDS Meters for Better Water Quality Monitoring},
journal = {Science Journal of Chemistry},
volume = {10},
number = {6},
pages = {211-218},
doi = {10.11648/j.sjc.20221006.13},
url = {https://doi.org/10.11648/j.sjc.20221006.13},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sjc.20221006.13},
abstract = {Water quality monitoring is of fundamental importance for health and environmental protection. Conductivity and the total dissolved substance (TDS) are two important water quality parameters. Their monitoring requires good calibration of the measuring equipment and correct assessment of the measurement uncertainty so that the water quality limits can be well judged. Though many published research articles include conductivity and TDS measurement results, there is no published ISO GUM approach for estimation of the uncertainty in the calibration measurement results. In this work, the linearity of a conductivity meter was established using three certified reference materials (CRMs) of 100, 500 and 1410.7μS/cm and then a one-point calibration using CRM of 1410.7μS/cm was carried out. The calibration method was validated by studying its accuracy, precision and bias. The method was found fit-for-the purpose and the uncertainty sources of calibration were identified and estimated based on ISO GUM. Then a standard solution of concentration 0.01M was prepared from high purity KCl to provide conductivity of 1411μS/cm. The corresponding TDS value of this solution was found 745 mg/L and its traceability to the SI units was achieved by weighing the mass of KCl using a calibrated balance and by measuring the volume of water using a calibrated measuring flak. This solution was used to perform a one-point calibration of a TDS meter then the meter was allowed to read the TDS 10 times and the uncertainty of the measurement results was estimated based on ISO GUM. The results obtained proved a very good calibration of both meters. An overall approach for estimation of the calibration uncertainty was developed, which will be very useful in water quality monitoring measurements.},
year = {2022}
}
TY - JOUR T1 - Calibration and ISO GUM Based Uncertainty of Conductivity and TDS Meters for Better Water Quality Monitoring AU - Adel Bassuoni Shehata AU - Abdulrahman Rashed AlAskar AU - Rashed Abdallah Al Dosari AU - Fahd Refaei Al Mutairi Y1 - 2022/11/30 PY - 2022 N1 - https://doi.org/10.11648/j.sjc.20221006.13 DO - 10.11648/j.sjc.20221006.13 T2 - Science Journal of Chemistry JF - Science Journal of Chemistry JO - Science Journal of Chemistry SP - 211 EP - 218 PB - Science Publishing Group SN - 2330-099X UR - https://doi.org/10.11648/j.sjc.20221006.13 AB - Water quality monitoring is of fundamental importance for health and environmental protection. Conductivity and the total dissolved substance (TDS) are two important water quality parameters. Their monitoring requires good calibration of the measuring equipment and correct assessment of the measurement uncertainty so that the water quality limits can be well judged. Though many published research articles include conductivity and TDS measurement results, there is no published ISO GUM approach for estimation of the uncertainty in the calibration measurement results. In this work, the linearity of a conductivity meter was established using three certified reference materials (CRMs) of 100, 500 and 1410.7μS/cm and then a one-point calibration using CRM of 1410.7μS/cm was carried out. The calibration method was validated by studying its accuracy, precision and bias. The method was found fit-for-the purpose and the uncertainty sources of calibration were identified and estimated based on ISO GUM. Then a standard solution of concentration 0.01M was prepared from high purity KCl to provide conductivity of 1411μS/cm. The corresponding TDS value of this solution was found 745 mg/L and its traceability to the SI units was achieved by weighing the mass of KCl using a calibrated balance and by measuring the volume of water using a calibrated measuring flak. This solution was used to perform a one-point calibration of a TDS meter then the meter was allowed to read the TDS 10 times and the uncertainty of the measurement results was estimated based on ISO GUM. The results obtained proved a very good calibration of both meters. An overall approach for estimation of the calibration uncertainty was developed, which will be very useful in water quality monitoring measurements. VL - 10 IS - 6 ER -
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