caa a22 4500 47706132X CHVBK 20180405111401.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00048260 doi (NATIONALLICENCE)springer-10.1007/BF00048260 Characteristics of turnover of carbonyl sulfide in four different soils [Elektronische Daten] [Susanne Lehmann, Ralf Conrad] Release and uptake of carbonyl sulfide (OCS) were measured at 25°C in samples of three forest soils (BL, BW, PBE) and one soil from a rape field (RA). The soil samples were flushed with a constant flow of either air (oxic conditions) or nitrogen (anoxic conditions) containing defined concentrations of OCS. A cryogenic trapping technique with liquid argon (-186 °C) was used to collect gas samples for analysis in a gas chromatograph equipped with a flame-photometric detector. The dependence of net OCS fluxes between soil and atmosphere could be described by a simple model of simultaneous OCS production and OCS uptake. By using this model, production rates (P), uptake rate constants (k) and compensation concentrations (m c ) of OCS could be determined as function of the soil type and the incubation conditions. Under oxic conditions, OCS production (P) and uptake were observed in all soils tested. However, the compensation concentrations (<166 ng l-1; 1 ng OCS l-1=0.41 ppbv) that were calculated from the model were high relative to the ambient OCS concentration (ca. 0.5 ppbv). The production rates (0.16-1.9 ng h-1 g-1 dw) that were actually measured when flushing the soil samples with air containing zero OCS were smaller than those (17-114 ng h-1 g-1 dw) calculated from the model. This observation was explained by two different concepts: one assuming the existence of a threshold concentration (m t ) below which OCS was no longer consumed in the soil; the other assuming the existence of two different OCS consumption processes, of which only the process active at elevated OCS concentrations was covered by the experiments. The latter concept allowed the estimation of OCS compensation concentrations that were partially low enough to allow the uptake of atmospheric OCS by soil. Both OCS production and uptake in PBE soil were dependent on soil temperature (optimum 20 °C) indicating a microbial process. However, both production and consumption of OCS were not consistently inhibited by sterilization of the soil, suggesting that they were not exclusively due to microbiological processes. Under anoxic conditions, OCS was also produced, but was not consumed except in one soil (RA). Production of OCS in the soils was stimulated after addition of thiocyanate, but not thiourea, thiosulfate, thioglycolate, tetrathionate, sulfate, elemental sulfur, cysteine and methionine. Kluwer Academic Publishers, 1996 carbonyl sulfide production nationallicence carbonyl sulfide consumption nationallicence compensation concentration nationallicence laboratory study nationallicence processes in soil nationallicence Lehmann Susanne Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Str., D-35043, Marburg, Germany aut Conrad Ralf Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Str., D-35043, Marburg, Germany aut Journal of Atmospheric Chemistry Kluwer Academic Publishers; gopher://gopher.wkap.nl 23/2(1996-02-01), 193-207 0167-7764 23:2<193 1996 23 10874 https://doi.org/10.1007/BF00048260 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00048260 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lehmann Susanne Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Str., D-35043, Marburg, Germany aut NATIONALLICENCE 700 1- Conrad Ralf Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Str., D-35043, Marburg, Germany aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 23/2(1996-02-01), 193-207 0167-7764 23:2<193 1996 23 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer