PARENT SESSION

PT07 Chemical and Biological Analysis of Endocrine Disrupting Compounds
Exhibit Hall
8:00 AM - Tuesday

(PT130) Endocrine modulators and excess nutrients in West Locust Creek and Little Medicine Creek in Northern Missouri.

Huang, Y¹, Liu, C¹, Nam, P¹, Niyogi, D¹, Solis, M¹, ¹ University of Missouri-Rolla, Rolla, MO, USA

ABSTRACT- Recent studies have shown the presence and biological effects of environmental estrogens in hog and cattle effluents. Potential problems with animal waste runoff into streams in heavy animal farming areas in Missouri have not been studied. We identify and monitor the levels of estrogenic chemicals in the two creeks receiving hog and pastured cattle farm runoff using gas chromatograph/mass spectrometry (GC/MS) analytical methods. 17-Estradiol, atrazine, p, p-DDE, metolachlor, stigmasterol, and -sitosterol were found in the water samples. The two creeks studied are listed as impaired waterbody on the 303(d) list. Most of the watershed consists of slopes in excess of 9% and constant soil erosion is characteristic. Excess nutrients due to agricultural runoff and soil erosion have long been a problem in these two streams. Total organic carbon, total nitrogen, and total phosphorus are very high and exhibit significant monthly fluctuations. Turbidity can be as high as 272 NTU, indicating high erosion and potential serious input of animal waste from the riparian zone. Other water quality data and the objectives of this four-year project will be discussed.

Key words: excess nutrients , endocrine modulators, estrogens, hogs