Journal:Construction of control charts to help in the stability and reliability of results in an accredited water quality control laboratory
| Full article title | Construction of control charts to help in the stability and reliability of results in an accredited water quality control laboratory |
|---|---|
| Journal | Sustainability |
| Author(s) | da Silva, Flávia M.O.; Silvério, Karina S.; Castanheira, Maria I.; Raposo, Mariana; Imaginário, Maria J.; Simões, Isabel; Almeida, Maria A. |
| Author affiliation(s) | Polytechnic Institute of Beja |
| Primary contact | Email: flavia dot silva at ipbeja dot pt |
| Editors | Kazak, J.K.; Sciavicco, G.; Kamińska, J.A. |
| Year published | 2022 |
| Volume and issue | 14(22) |
| Article # | 15392 |
| DOI | 10.3390/su142215392 |
| ISSN | 2071-1050 |
| Distribution license | Creative Commons Attribution 4.0 International |
| Website | https://www.mdpi.com/2071-1050/14/22/15392 |
| Download | https://www.mdpi.com/2071-1050/14/22/15392/pdf (PDF) |
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This article should be considered a work in progress and incomplete. Consider this article incomplete until this notice is removed. |
Abstract
Overall, laboratory water quality analysis must have stability in their results, especially in laboratories accredited by ISO/IEC 17025. Accredited parameters should be strictly reliable. Using control charts to ascertain divergences between results is thus very useful. The present work applied a methodology of analysis of results through control charts to accurately monitor the results for a wastewater treatment plant. The parameters analyzed were pH, biological oxygen demand for five days (BOD5), chemical oxygen demand (COD), total suspended solids (TSS), and total phosphorus (TP). The stability of the results was analyzed from the control charts and 30 analyses performed in the last 12 months. From the results, it was possible to observe whether the results were stable, according to the rehabilitation factor, which cannot exceed WN = 1.00, and the efficiency of removal of pollutants, which remained above 70% for all parameters. The method of determining the technological reliability and stability of the treatment station by use of control charts proves to be an efficient tool for detecting any instability in the results. As such, this method helps to monitor the results of such analyses more clearly and thus enables a rapid response to possible disturbances and maintains the quality of the analysis control, as well as determining the accreditation entities.
Keywords: water quality, control charts, reliability, wastewater treatment
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This presentation is faithful to the original, with only a few minor changes to presentation. Grammar was tweaked significantly to improve readability. The PMCID and DOI were also added when they were missing from the original reference.
