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Volatile Sulfur Compounds From a Redox-controlled-cattle-manure Slurry¹

ABSTRACT

Volatile S compounds have been implicated as contributors to the odor problem from cattle-feedlots. This study was designed to evaluate the effects of oxidation-reduction potentials (E_h) on the type and amount of volatile S compounds released from cattle manure. The laboratory experiment utilized a manure slurry controlled at pH 7, 30°C, and at preselected E_h levels. The E_h of the slurry was initially controlled at +300 mV, and subsequently decreased in increments of 100 mV/week through –200 mV. Effluent gases from the incubation flask were trapped, and the S gases analyzed by gas chromatography. Carbonyl sulfide (COS) and carbon disulfide (CS₂) production was low (0.07 µg/g manure/d) at all redox levels. Dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) were highest at 0 mV, while hydrogen sulfide (H₂S) and methanethiol (MeSH) were greatest at –100 mV. The total amount of S volatilized from the manure slurry as each compound was: H₂S, 155 µg; MeSH, 135 µg; DMS, 83 µg; DMDS, 27 µg; COS, 8 µg; and CS₂, 3 µg; representing about 1.7% of the total manure S.

Key Words: oxidation-reduction • E_h • odors • H₂S • COS • MeSH • DMS • DMDS • CS₂

¹ Contribution from USDA-ARS, P.O. Box E, Fort Collins, CO 80522 in cooperation with Colorado State Univ. Exp. Stn., Sci. Journal Series no. 2718.

² Chemist and Soil Scientist, USDA.

Received for publication February 13, 1982.

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