Ultra-clean Water Sampler (IMAGE) Helmholtz Association Caption The ultra-clean water sampler on its way out of the water. This device was developed by NIOZ and is used in the framework of the GEOTRACES project to measure iron concentrations. Credit Ismael Nunez-Riboni / Alfred Wegener Institute Usage Restrictions For use in context with the above mentioned press release only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.