Abstract
Volatilization of dimethylselenide (DMSe) to the atmosphere has been extensively studied, but little is known on its fate in soil environments. This study examined the transport and transformation of DMSe in soil. The transport of DMSe in soil columns was related to the soil moisture content. About 87−96% of the total injected DMSe in air-dried soil was volatilized to the air, whereas in a moist and flooded soil, only 20−88% and 4.3−16.8% were emitted to the air, respectively. After incubation of 40 days, about 13.1−38.8% of the total DMSe was converted to nonvolatile Se in moist soils (35% moisture). This transformation increased with increasing soil moisture content and was also much higher in soil amended with MnO2 in which about 95% of the total DMSe was converted to nonvolatile Se. Oxidized dimethylated Se (ODMSe), which included dimethyl selenoxide (DMSeO) and/or dimethyl selenone (DMSeO2), was the dominant form of nonvolatile Se, accounting for 43.5−53% in the moist soil and 80−90% in the flooded soils. The percentage of other Se species in the experimental soils followed a general descending order: Se[0, −II] > Se[IV] > organic Se > Se[VI]. This study showed that accumulation and transformation of DMSe may be important processes responsible for a low volatilization rate of DMSe in flooded soils and sediments.
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