NDLI: Microbial Degradation of Dimethylsilanediol in Soil

Content Provider	Springer Nature Link
Author	Lehmann, R. G. Miller, J. R. Collins, H. P.
Copyright Year	1998
Abstract	Dimethylsilanediol (DMSD) is the ultimate hydrolysis product of silicone (polydimethylsiloxane = PDMS) polymer in soil. Our previous paper showed that it would volatilize from soil, and the present study investigates the importance of microbial degradation in removing DMSD from soil. DMSD ($^{14}$C-labeled) was thus incubated (1 mg kg$^{-1}$) for 30 wk at 25 °C in soils from a permanent grass field, a corn field, a deciduous woodland, and a pine woodland. Release of$^{14}$ CO$_{2}$ varied from 0.4 to 1.6% wk$^{-1}$. For 3 of the soils, $^{14}$CO$_{2}$ increased with higher microbial biomass, while organisms in the deciduous woodland soil were more active in degrading DMSD than organisms in the other soils. After 30 weeks, most of the remaining $^{14}$C in the soil had moved from freely available water extractable to less available acid and base extractable fractions. Similar incubations with 2% plant litter showed extensive transfer of the DMSD into the litter layer. Incubations with a microbial inhibitor showed less DMSD degradation, while cold storage of soils almost completely stopped degradation. These results suggest that microbial degradation is an important mechanism of DMSD loss from soil.
Starting Page	111
Ending Page	122
Page Count	12
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	106
Issue Number	1-2
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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