An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Liu I, Lawton LA, Robertson PK.Liu I, et al.Environ Sci Technol. 2003 Jul 15;37(14):3214-9. doi: 10.1021/es0201855.Environ Sci Technol. 2003.PMID: 12901672
Liu I, Lawton LA, Bahnemann DW, Liu L, Proft B, Robertson PK.Liu I, et al.Chemosphere. 2009 Jul;76(4):549-53. doi: 10.1016/j.chemosphere.2009.02.067. Epub 2009 Apr 17.Chemosphere. 2009.PMID: 19375779