Estrogens in streams associated with a concentrated animal feeding operation in upstate New York, USA

摘要

Estrogens (estrone, 17α-estradiol, 17β-estradiol, and estriol) in three headwater streams within a concentrated animal feed operation (CAFO) site were monitored on a monthly base for a year (November 2006-October 2007). This CAFO is certified as organic (no growth promoters are administrated) and uses many Whole Farm Planning practices (e.g., 12-month-capacity waste storage lagoons). In general, estrogen concentrations in the streams are low (＜1 ng L~(-1)), and appeared to increase in spring, likely due to the mobilization of estrogens from soils upon snow melting/precipitation. Estrogens were detected in the streams during dry periods, indicating the contribution of estrogens from groundwater. The low concentrations of estrogens in stream water were probably the result of the long residence time (～8 months) of the manure in the lagoons where most of the estrogens were degraded during storage. An analysis of liquid manure at the beginning of manure application season (after ～8 months storage) showed that over 99.8% of the estrogens potentially excreted by the cows were degraded. Moreover, about 90% of the estrogens in the liquid manure were associated with particulates larger than 0.7 μm. Batch experiments with spiked deuterium-labeled 17β-estradiol-16,16,17-d_3 (d_3-E2β) in the liquid manure demonstrated sorption of d_3-E2β onto particulates in the liquid manure, and rapid degradation of d_3-E2β in the aqueous phase and on particulates of the liquid manure under aerobic conditions.