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Published in Soil Sci Soc Am J 38:80-85 (1974)
© 1974 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Azide and Ethylenethiourea Mobility in Soils1

Charles S. Helling and Susan M. Thompson2

ABSTRACT

A masking technique was developed for visualizing nonradioactive compounds on soil thin-layer chromatographic plates. To determine azide mobility, leached plates were sprayed with a kaolinite slurry in 95% ethanol, air-dried, and resprayed with 2% Fe(NO3)3 in 5% HNO3. The average RF of azide in four mineral soils was 0.87, and in a muck 0.21; it is thus quite mobile in most soils. The form of azide (NaN3, KN3, or KN3 + K2CO3) did not affect mobility. 2-Imidazolidinethione (ethylenethiourea, or ETU), a degradation product of ethylenebis (dithiocarbamate) fungicides, was evaluated after masking with kaolinite + alumina (1:2), sprayed onto soil plates in 95% ethanol. Nitroprusside and Grote's reagents were useful chromogenic reagents. Mobility was also determined by autoradiography of [14C]ETU; average RF's for four mineral soils ranged from 0.83 to 1.00, decreasing to 0.61 in a muck. Although weakly adsorbed from solution, ETU is immobilized by drying the soil before leaching. 2-Imidazolidone (ethyleneurea) and possibly sulfur were detected in soil incubated 7 days with ETU.

NOTES

1 Contribution from the Agricultural Research Service, USDA, Beltsville, Maryland.

2 Soil Scientist and Botanist, respectively, Agricultural Environmental Quality Institute, ARS, USDA, Beltsville, Md. 20705.

Received for publication June 18, 1973. Accepted for publication August 21, 1973.






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Copyright © 1974 by the Soil Science Society of America.