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), 2024. Published by Science Publishing Group |
Conductivity, TDS, Calibration, Method Validation, ISO GUM Uncertainty
| [1] | Adeyeye EI, (1994). Determination of heavy metals in Illisha Africana, associated water, soil Sediments from some fish ponds, International Journal of Environmental Study, 45, pp 231-240. |
| [2] | Patil P. N, Sawant D. V, Deshmukh R. N. (2012). Physico-chemical parameters for testing of water; A review, international journal of environmental sciences Volume 3, No 3. |
| [3] | Basavaraja S. M, Hiremath K. S, Murthy K. N, Chandrashekarappa, A. N, Patel E. T (2011); Analysis of Water Quality Using Physico-Chemical Parameters Hosahalli Tank in Shimoga District, Karnataka, India, Global Journal of Science Frontier, Research, 1 (3), pp 31-34. |
| [4] | Andres M, Maile P, Argo J. (2013). A new approach for describing the relationship between electrical conductivity and major anion concentration in natural waters; Applied Geochemistry 38 103–109. |
| [5] | Hem, J. D. (1989). The study and interpretation of the chemical characteristics of natural water, third ed. U.S. Geol. Surv. Water Supply Paper 2254. |
| [6] | Navneet, Kumar, D. K. S. (2010). Drinking water quality management through correlation studies among various physicochemical parameters: A case study, International Journal of Environmental Sciences, 1 (2), pp 253-259. |
| [7] | UNEP, (2004). Manual for National Training Programme. Malé Declaration on Control and Prevention of Air Pollution and Its likely Transboundary Effects for South Asia. United Nations Environment Programme. http://www.rrcap.unep.org/male/. |
| [8] | Patil P. N, Sawant D. V, and Deshmukh R. N, (2012). Physico-chemical parameters for testing of water - a review, Int. J. Environ. Sci. 3 1194–1207. |
| [9] | Marandi A, Polikarpus M and Jõeleht A (2013). A new approach for describing the relationship between electrical conductivity and major anion concentration in natural waters Appl. Geochemistry 38 103–109. |
| [10] | Daniels W L, Zipper C E, Orndorff Z W, Skousen J, Barton C D, McDonald L M and Beck M A (2016). Predicting total dissolved solids release from central Appalachian coal mine spoils Environ. Pollut. 216 371–379. |
| [11] | Moujabber, M. E, Samra B. B, Darwish T. and Atallah T. (2006). Comparison of different indicators for groundwater contamination by seawater intrusion on the Lebanese coast Water Resour. Manag. 20 161–180. |
| [12] | Stigter T. Y, Ribeiro L. and Carvalho D. (2006). Application of a groundwater quality index as an assessment and communication tool in agro-environmental policies - Two Portuguese case studies J. Hydrol 327 578-891. |
| [13] | Nonner J. C (2015). Introduction to Hydrogeology (London: CRC Press, Taylor and Francis Group). |
| [14] | Han D., Kohfahl C., Song X., Xiao G. and Yang J. (2011). Geochemical and isotopic evidence for palaeo-seawater intrusion into the south coast aquifer of Laizhou Bay, China, Appl. Geochemistry 26 863-883. |
| [15] | Kumar S. K, Logeshkumaran A., Magesh N. S, Godson P. S. and Chandrasekar N. (2015). Hydrogeochemistry and application of water quality index (WQI) for groundwater quality assessment, Anna Nagar, part of Chennai City, Tamil Nadu, India Appl. Water Sci. 5 335–343. |
| [16] | Hem, D. (1985). Study and Interpretation the Chemical of Natural of Characteristics Natural Water 3rd edition USGS Water Supply Paper 2254 66-69 US Gov. Printing Office Washington DC. |
| [17] | JCGM 200 (2012). International vocabulary of metrology–Basic and general concepts and associated terms (VIM), 3rd edition. |
| [18] | BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML (1993). Guide to the expression of uncertainty in measurement. 1st edition. |
| [19] | Elena H. and Christian W. (2015). Establishing a conversion factor between electrical conductivity and total dissolved solids in South African mine waters; Water SA Vol. 41 No. 4. |
| [20] | The International Council for Harmonization of Technical Requirements for Pharmaceuticals for Humane Use, ICH (2005). 3rd Ed. |
| [21] | EURACHEM, The Fitness for Purpose of Analytical Methods A Laboratory Guide to Method Validation and Related Topics (2014). 2nd Ed. |
| [22] | EURACHEM/CITAC Guide CG 4 Quantifying Uncertainty in Analytical Measurement (2012). 3rd Ed. |
| [23] | Leito, I., Strauss, L. Koort, E., Pihl, V. (2002). Estimation of uncertainty in routine pH measurement. Accred Qual Assur, 7: 242-249. |
| [24] | Shehata A. B, AlAskar A. R, AlDosari, R. A and AlMutairi F. R (2021). Uncertainty of Multipoint Calibration of pH-meters with Glass Electrode Used for Routine pH Measurements in the pH-mode; International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (IJAREEIE), Volume 10, Issue 12, December 2021. |
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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