Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Uniform analyses for clean drinking water in Europe

14.12.2009
PTB scientists receive award for concept of comparability and traceability of water analyses

Clean water is a matter of survival for humans, particularly when it is used for drinking, cooking and for food manufacture. Therefore, the EU member countries have in several guidelines undertaken to guarantee their citizens sustainable clean drinking water.

The requirement for this is, however, a water analysis that provides the exact values for possible toxic substances, which are then also internationally comparable. Therefore, scientists from the Physikalisch-Technische Bundesanstalt (PTB), together with researchers from the University of Stuttgart (AQS BW) and the Rhenish-Westphalian Institute for Water Research (IWW) have worked out new metrological concepts as to how the comparability of measurement results can be achieved without additional time and effort. For this work, in November, the researchers received the CITAC Award 2009.

CITAC stands for Cooperation on International Traceability in Analytical Chemistry and is an association of representatives of important industrial countries from all continents. Their goal is to improve the traceability in chemistry at the global level. The international comparability of analytical measurement results is to be ensured, independent of the time and place of its origin. This is of crucial importance for achieving uniform standards of quality for drinking water in all the European countries.

Nationally and internationally, chemical measurements are compared as a rule by round-robin tests. Hereby, the participating laboratories receive samples of unknown concentration for analysis. Until now, a result was deemed to be good if it was as close as possible to the mean value of all participants' results. This so-called consensus value can, however, clearly deviate from the actual concentration and thus possesses a correspondingly large uncertainty. The new concept for conducting round-robin tests by PTB, AQS BW and IWW uses metrologically traceable reference values with possible uncertainties in the range of one percent or less. These reference values serve as a basis for the increasingly required international comparability of measurement values and are, moreover, available to the participating laboratories as reliable reference points for checking the accuracy of their measuring methods.

This is made possible by very accurate sample preparation: The sample preparations are performed by gravimetric or volumetric addition of certain amounts of the analytes to tap water (matrix). The reference values are determined from the added amounts as well as the concentration of the analytes present from the outset in the original tap water. To determine the latter is difficult, however, due to the mostly low concentration. It was now possible to demonstrate that the participants' results could be drawn on to determine the initial concentration of the water. To this end, a method similar to that of the standard addition was developed, with which these initial concentrations were obtained through extrapolation, without additional work expended and with sufficiently good uncertainty.

Contact at PTB:
Detlef Schiel, Working Group 3.11 Inorganic Analytics,
Tel.: +49 531 592-3110, e-mail: detlef.schiel@ptb.de

Olaf Rienitz, Working Group 3.11 Inorganic Analytics,
Tel.: +49 531 592-3318, e-mail: olaf.rienitz@ptb.de

Detlef Schiel | EurekAlert!
Further information:
http://www.ptb.de

Further reports about: AQS Analytic IWW PTB drinking water inorganic toxic substance uniform volumetric addition

More articles from Physics and Astronomy:

nachricht New NASA study improves search for habitable worlds
20.10.2017 | NASA/Goddard Space Flight Center

nachricht Physics boosts artificial intelligence methods
19.10.2017 | California Institute of Technology

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>