Abstract
AbstractVolatile 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 (Eh) 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 Eh levels. The Eh 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.
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