Zhenyu Tian Prepares a Sample (IMAGE) University of Washington Caption Using a new "non-targeted" approach, researchers at the University of Washington and UW Tacoma screened samples from multiple regions of Puget Sound to look for potentially concerning chemicals. Here research scientist Zhenyu Tian prepares a sample for mass spectrometry. Credit Ryan Moriarty/UW Tacoma Usage Restrictions For reuse with appropriate credit. 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.