Distribution of the Concentrations of Compounds Detected

The distribution of the concentrations of compounds detected in the 75 stream samples collected during 2008. The frequency of detection of each compound (in percent) is plotted on the hoizontal axis. The following are the abreviations used for each compound: ATZ–atrazine (herbicide), CIAT–deethylatrazine (herbicide metabolite), FOR–formononetin (phytoestrogen), Equol–(phytoestrogen), DON–deoxynivalenol (mycotoxin), DAI–daidzein (phytoestrogen), BIO–biochanin A (phytoestrogen), ZON–zearalenone (mycotoxin), GEN–genistein (phytoestrogen); COU–coumestrol (phytoestrogen). Modified from Kolpin and others, 2010.