An easy uncertainty evaluation of the COD titrimetric analysis in correlation with quality control and validation data. Method applicability region

Amanatidou, Elisavet; Trikoilidou, Eleni; Samiotis, Georgios; Benetis, Nikolas P.; Taousanidis, Nikolaos

doi:10.1039/c2ay25687h

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…All analyses were conducted at the accredited according to ISO 17025 'Environmental Chemistry & Water and Wastewater Treatment Laboratory', Department of Chemical Engineering, University of Western Macedonia, Greece. The laboratory calculates measurement uncertainties in all the applied methods (Amanatidou et al 2012;Trikilidou et al 2020).…”

Section: Other Analysesmentioning

confidence: 99%

Assessment of Synechococcus elongatus PCC 7942 as an option for sustainable wastewater treatment

Samiotis

Stamatakis

Amanatidou

2021

Water Science and Technology

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Industrial wastewaters are recognized as a valuable resource, however their disposal without proper treatment can result in environmental deterioration. The associated environmental/operational cost of wastewater treatment necessitates upgrade of applied processes towards the goals of sustainability and mitigation of climate change. The implementation of cyanobacteria-based processes can contribute to these goals via resources recovery, production of high-value products, carbon fixation and green-energy production. The present study evaluates the cyanobacterium Synechococcus elongatus PCC 7942 (S7942) as a biological component for novel and sustainable alternatives to typical biological nutrient removal processes. Valuable results regarding cultivation temperature boundaries, applied disinfection techniques and analytical methods, as well as regarding relations between parameters expressing S7942 biomass concentration are presented. The results show that at typical industrial wastewater temperatures, S7942 efficiently grew and removed nitrates from treated snack-industry's wastewater. Moreover, in cultures with treated and relatively saline dairy wastewater, its growth rate slightly decreased, but nevertheless nitrates removal rate remained efficiently high. A comparison between typical denitrification processes and the proposed nutrient removal process indicated that a S7942-based system may constitute an alternative or a supplementary to denitrification process. Thus, Synechococcus elongatus PCC 7942 proved to be a potent candidate towards sustainable industrial wastewater treatment applications.

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Section: Other Analysesmentioning

confidence: 99%

Assessment of Synechococcus elongatus PCC 7942 as an option for sustainable wastewater treatment

Samiotis

Stamatakis

Amanatidou

2021

Water Science and Technology

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“…Amanatidou et al, 2012 [127] Uncertainty estimation in measurement of pKa values in nonaqueous media: a case study on basicity scale in acetonitrile medium. Sooväli et al, 2006 [128] Uncertainty of chemical oxygen demand determination in wastewater samples.…”

Section: Et Al 2002 [122]mentioning

confidence: 99%

A Practical Way to ISO/GUM Measurement Uncertainty for Analytical Assays Including In-House Validation Data

González¹,

Herrador²,

GarcíaAsuero³

et al. 2018

Quality Control in Laboratory

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In this contribution, we outline the estimation of measurement uncertainty of analytical assays in a practical way, according to the so-called reconciliation paradigm, by considering the heritance of uncertainties according to the ISO Guide to the expression of uncertainty in measurement (ISO/GUM) approach and the accuracy (bias and precision) study coming from the in-house method validation. A cause and effect analysis is performed by using the Ishikawa diagram or fishbone plot, consisting of a hierarchical structure reaching a final outcome that is the analytical result. The procedure is illustrated with a case study. This procedure may be very suitable for processing data in accreditation of routine assays.

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“…Because chloride ions can be oxidized to chlorine by strong oxidizing agents and can result in a positive error in the COD determination, 5 both the conventional COD Cr and COD Mn indexes suffer from the interference of chloride ions. [3][4][5] The present means established for eliminating the interference of chloride is the addition of mercury(II) sulfate and/or silver sulfate to complex it and thus prevent its oxidation. 8,39 Thus, the interference due to chloride ions is studied by adding chloride ions in various amounts in the range of 0-800 mg L À1 to the KHP standard sample under the optimized operation conditions.…”

Section: Interference Of Chloride Ionsmentioning

confidence: 99%

“…1,2 In particular, chemical oxygen demand (COD) has been widely employed as a comprehensive parameter for the quality assessment of various water samples. 1,[3][4][5][6][7] Conventionally, since the COD values of unknown aqueous samples are generally dened with the found values from the classical redox titration methods, in which potassium permanganate and potassium dichromate are oen chosen as oxidants, two types of COD indexes, denoted by either COD Cr or COD Mn have been established. However, from an extensive search of the literature, 1,3-5 it was found that, based on the distinct analytical properties of the two standard methods, COD Cr is the preferred method for assessing the water quality in heavily contaminated water bodies, and COD Mn is preferred for relatively clean water bodies with low-level COD values (COD Mn index less than 5.0 mg O 2 L À1 ).…”

Section: Introductionmentioning

confidence: 99%

Accurate determination of low-level chemical oxygen demand using a multistep chemical oxidation digestion process for treating drinking water samples

Tie

Zhou

et al. 2016

Anal. Methods

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An easy uncertainty evaluation of the COD titrimetric analysis in correlation with quality control and validation data. Method applicability region

Cited by 15 publications

References 14 publications

Assessment of Synechococcus elongatus PCC 7942 as an option for sustainable wastewater treatment

Assessment of Synechococcus elongatus PCC 7942 as an option for sustainable wastewater treatment

A Practical Way to ISO/GUM Measurement Uncertainty for Analytical Assays Including In-House Validation Data

Accurate determination of low-level chemical oxygen demand using a multistep chemical oxidation digestion process for treating drinking water samples

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