IMEP-25a: Determination of Bromate in Drinking Water - A Collaborative Trial Report
A collaborative study, IMEP-25a, was conducted in accordance with international protocols to determine the performance characteristics of an analytical method for the determination of dissolved bromate in drinking water. The method should fulfil the analytical requirements of the Council Directive 98/83/EC (referred in this report as the Drinking Water Directive, DWD). The method is based on ion chromatography followed by post column reaction and ultraviolet detection. This method follows a draft method from the International Organization for Standardization (Draft ISO/DIS 11206).
The previous standard method (ISO 15061:2001) is based on ion chromatography using suppressed conductivity detection whereby a pre-concentration step may be required for the determination of bromate concentrations as low as 3 µg L-1 to 5 µg L-1. The new method includes a dilution step allowing the determination of bromate concentrations = 0.5 µg L-1. Furthermore, the method aims to minimize any potential interference of chlorite ions.
The collaborative study investigated different types of drinking water such as soft drinking water, hard drinking water and mineral water. Other types of water such as raw water (untreated), swimming pool water, a blank (named river water) and a bromate standard solution were also included as test samples.
All test matrices, but the swimming pool water, were spiked with high purity potassium bromate to obtain bromate concentrations ranging from 1.67 to 10.0 µg L-1. Swimming pool water was not spiked as this water was incurred with bromate.
Test samples were dispatched to 17 laboratories in 9 different countries. Sixteen participants reported results.
The repeatability relative standard deviation (RSDr) ranged from 1.2 to 4.1 % while the reproducibility relative standard deviation (RSDR) ranged from 2.3 to 5.9 %.
These precision characteristics are in good agreement, if not better, than those of the ISO 15601. A thorough comparison of the performance characteristics is presented in this report. All method performance characteristics obtained in the frame of this collaborative trial indicates that the draft ISO/DIS 11206 standard method meets the requirements set down by the DWD. The draft ISO/DIS 11206 standard method can be therefore considered to fit its intended analytical purpose.
CORDEIRO RAPOSO Fernando;
SCHMITZ Franz;
VERBIST Inge;
EMTEBORG Per;
CHAROUD-GOT Jean;
CONTRERAS LOPEZ Maria Concepcion;
ROBOUCH Piotr;
TAYLOR Philip;
DE LA CALLE GUNTINAS Maria Beatriz;
2010-10-20
Publications Office of the European Union
JRC59582
978-92-79-16226-8,
1018-5593,
EUR 24469 EN,
OP LA-NA-24469-EN-C,
https://publications.jrc.ec.europa.eu/repository/handle/JRC59582,
10.2787/28969,
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