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- W3176360649 abstract "Abstract This article addresses the issue of estimating P om —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 P om 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 P om , 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 P om 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 ." @default.
- W3176360649 created "2021-07-05" @default.
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- W3176360649 date "2021-07-01" @default.
- W3176360649 modified "2023-09-25" @default.
- W3176360649 title "Uncertainty of chemical status in surface waters" @default.
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- W3176360649 doi "https://doi.org/10.1038/s41598-021-93051-9" @default.
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