Uncertainty of chemical status in surface waters

Abstract This article addresses the issue of estimating Pom—the probability of misclassifying the chemical status confidence of a water body status assessment. The main concerns of the authors were chemical quality elements with concentrations in water bodies which are close to or even smaller than...

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Autores principales:	Małgorzata Loga, Karol Przeździecki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/43c07b35f6ae4470b32c9e68019e245c
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id	oai:doaj.org-article:43c07b35f6ae4470b32c9e68019e245c
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spelling	oai:doaj.org-article:43c07b35f6ae4470b32c9e68019e245c2021-12-02T16:31:47ZUncertainty of chemical status in surface waters10.1038/s41598-021-93051-92045-2322https://doaj.org/article/43c07b35f6ae4470b32c9e68019e245c2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93051-9https://doaj.org/toc/2045-2322Abstract This article addresses the issue of estimating Pom—the probability of misclassifying the chemical status confidence of a water body status assessment. The main concerns of the authors were chemical quality elements with concentrations in water bodies which are close to or even smaller than the limit of quantification (LOQ). Their values must be set to half of this limit to calculate the mean value. This procedure leads to very low standard deviation values and unrealistic values of Pom for chemical indicators. In turn, this may lead to the false conclusion that not only is the chemical status good but also that this status assessment is perfect. Therefore, for a more reliable calculation of Pom, the authors suggested a modified calculation in which the value of half the LOQ for calculating the mean value was kept, but zero as the concentration value for the standard deviation calculation was adopted. The proposed modification has been applied to the Hierarchical Approach procedure for Pom estimation of the chemical status of Polish rivers and lakes. The crucial finding is that current chemical status assessments may be incorrect in the case of approximately 25% of river water bodies and 30% of lake water bodies categorised as good, and 20% of both types of water bodies classified as below good.Małgorzata LogaKarol PrzeździeckiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Małgorzata Loga Karol Przeździecki Uncertainty of chemical status in surface waters
description	Abstract This article addresses the issue of estimating Pom—the probability of misclassifying the chemical status confidence of a water body status assessment. The main concerns of the authors were chemical quality elements with concentrations in water bodies which are close to or even smaller than the limit of quantification (LOQ). Their values must be set to half of this limit to calculate the mean value. This procedure leads to very low standard deviation values and unrealistic values of Pom for chemical indicators. In turn, this may lead to the false conclusion that not only is the chemical status good but also that this status assessment is perfect. Therefore, for a more reliable calculation of Pom, the authors suggested a modified calculation in which the value of half the LOQ for calculating the mean value was kept, but zero as the concentration value for the standard deviation calculation was adopted. The proposed modification has been applied to the Hierarchical Approach procedure for Pom estimation of the chemical status of Polish rivers and lakes. The crucial finding is that current chemical status assessments may be incorrect in the case of approximately 25% of river water bodies and 30% of lake water bodies categorised as good, and 20% of both types of water bodies classified as below good.
format	article
author	Małgorzata Loga Karol Przeździecki
author_facet	Małgorzata Loga Karol Przeździecki
author_sort	Małgorzata Loga
title	Uncertainty of chemical status in surface waters
title_short	Uncertainty of chemical status in surface waters
title_full	Uncertainty of chemical status in surface waters
title_fullStr	Uncertainty of chemical status in surface waters
title_full_unstemmed	Uncertainty of chemical status in surface waters
title_sort	uncertainty of chemical status in surface waters
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/43c07b35f6ae4470b32c9e68019e245c
work_keys_str_mv	AT małgorzataloga uncertaintyofchemicalstatusinsurfacewaters AT karolprzezdziecki uncertaintyofchemicalstatusinsurfacewaters
_version_	1718383866663665664

Uncertainty of chemical status in surface waters

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