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Persistence of Estrogenic Hormones in Agricultural Soils

I. 17ß-Estradiol and Estrone

Agriculture and Agri-Food Canada, Research Branch, 1391 Sandford Street, London, ON, Canada N5V 4T3

View larger version (14K): [in a new window]   Fig. 1. Structures of the estrogenic hormones 17ß-estradiol and estrone. [4-14C]-17ß-Estradiol and [4-14C]-estrone were labeled in the indicated positions.

View larger version (34K): [in a new window]   Fig. 2. Persistence of 1 mg kg-1 [4-14C]-17ß-estradiol in a sandy loam soil (triangle), a silt loam soil (square), and a loam soil (circle) incubated at 30°C. Soils were adjusted to a moisture content of 13%. The soils were nonsterile (left panels) or autoclaved (right panels). Top panels: total extractable radioactivity expressed as a percentage of that initially applied. Middle panels: distribution of radioactivity in 17ß-estradiol (open symbols) and estrone (closed symbols) determined by high performance liquid chromatography (HPLC) with radioactivity detection, and expressed as a percentage of the total extractable radioactivity in that sample. Bottom panels: total estrogenic activity in soil extracts measured with the yeast estrogenicity screen (YES) bioassay, and expressed as 17ß-estradiol equivalents.

View larger version (18K): [in a new window]   Fig. 3. Effect of temperature on mineralization of 1 mg kg-1 [4-14C]-17ß-estradiol in a loam soil adjusted to a moisture content of 13%. The soil was incubated at 4°C (closed circles), 10°C (open circles), 19°C (closed inverted triangles), 30°C (open inverted triangles), or 37°C (closed squares).