Bottom-up measurement uncertainty evaluation for Cr(III) and Cr(VI) speciation in natural water by HPLC-ICP-MS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73633550" target="_blank" >RIV/61989592:15310/25:73633550 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0026265X25005442" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0026265X25005442</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.microc.2025.113190" target="_blank" >10.1016/j.microc.2025.113190</a>

Result language

angličtina

Original language name

Bottom-up measurement uncertainty evaluation for Cr(III) and Cr(VI) speciation in natural water by HPLC-ICP-MS

Original language description

The monitoring of Cr(III) and Cr(VI) in natural waters is essential for the assessment of chromium-based levels that deteriorate the water quality and adversely affect aquatic biota. The evaluation of the uncertainty of this monitoring is crucial for the determination of their fitness for purpose and for the objective interpretation of the quantitative information. There is a great need for a detailed bottom-up evaluation of the uncertainty of Cr(III) and Cr(VI) measurements in natural waters by ion-exchange high-performance liquid chromatography inductively coupled plasma mass spectrometry. Detailed models of the uncertainty of sample dilution, calibrator preparation and sample signal interpolation in a weighted calibration curve are proposed. The models proved adequate from the metrological compatibility between reference and estimated concentrations of spiked river waters. Measurement of Cr(III) and Cr(VI) above 0.98 mu g L-1 and 0.5 mu g L-1 with relative expanded uncertainties as low as 4.0%, and 2.3%, respectively, can be achieved. For not diluted samples, calibrators&apos; values and sample signal interpolation are responsible for between 14% and 82% or 18% and 85% of the uncertainty. The analysis of a certified reference material proved that the Cr(III)/Cr(VI) interconversion during analytical work is negligible. The developed measurement models were successfully applied to the analysis of river waters and groundwater collected in the Czech Republic. Only Cr(III) at the concentration levels around 1 mu g L-1 was detected in the river samples, whereas a toxic Cr(VI) was determined in groundwater. The proposed validated methodology and user-friendly spreadsheet for the detailed evaluation of measurement uncertainty can be generally applied to other speciation approaches, where the separation techniques are hyphenated with either organic or elemental mass spectrometry.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10406 - Analytical chemistry

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

MICROCHEMICAL JOURNAL

ISSN

0026-265X

e-ISSN

1095-9149

Volume of the periodical

212

Issue of the periodical within the volume

MAY

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

7

Pages from-to

"113190-1"-"113190-7"

UT code for WoS article

001441408600001

EID of the result in the Scopus database

2-s2.0-85219362080