Uptake and conversion of carbonyl sulfide in a lawn soil

Abstract

Carbonyl sulfide (COS) exchange fluxes between a lawn soil and the atmosphere as well as influencing factors (temperature and water content of soil) were investigated using a static cuvette. The optimal soil temperature and water content for COS consumption were about 298 K and 12.5%, respectively. The converting products of the consumed COS in the lawn soil were researched using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The peaks of gas-phase products of CO 2 and surface HCO À 3 , HS À , SO 2À 3 , HSO À 3 , and SO 2À 4 species were observed. The possible mechanism of COS conversion in the lawn soil was discussed. The conversion rates of consumed COS into water-soluble sulfate in the lawn soil were studied by ion chromatography (IC). The experimental results show that about 50% sulfur from the soil consumed COS was eventually converted into water-soluble sulfate. r

Anthropogenic contributions to global carbonyl sulfide, carbon disulfide and organosulfides fluxes

“…This is in reasonable agreement with Watts (2000), but larger than the 80% of Weisenstein et al (1997). As sulfur is a key plant nutrient, the uptake of OCS by soils might be a path for sulfur supplement to vegetation, especially in remote areas (Liu et al, 2007;Yi et al, 2010). OCS can be oxidized in soils (e.g.…”

Heterogeneous uptake of carbonyl sulfide onto kaolinite within a temperature range of 220–330 K

“…In our previous work we have confirmed that surface OH is the reactive site for the heterogeneous reaction or adsorption of OCS on mineral oxides [ Liu and He , 2009; Liu et al , 2006; J. Liu et al , 2007; Y. Liu et al , 2007; Liu et al , 2009]. Kaolinite is a type of aluminum phyllosilicate mineral with the empirical formula Al 2 Si 2 O 5 (OH) 4 , indicating that there are two types of adsorption sites (Al and Si sites) for OCS on the surface of kaolinite.…”

“…[13] In our previous work we have confirmed that surface OH is the reactive site for the heterogeneous reaction or adsorption of OCS on mineral oxides Liu et al, 2006;J. Liu et al, 2007;.…”

“…Furthermore, soils were identified as being very important in the sinks and sources of OCS in the atmosphere [ Kesselmeier et al , 1999; Kettle et al , 2002; Liu et al , 2007a; Yi et al , 2007]. Oxic soils, for example, are considered important sinks of OCS, whereas anoxic soils are sources of OCS.…”

“…Compared to coarse‐mode particles (single‐component oxides) with faster rates of gravitational settling, kaolinite clays undergoing long‐range transport may have a greater influence on the sink of OCS. Additionally, soils have been considered to be important in the sinks and sources of OCS in the atmosphere [ Kesselmeier et al , 1999; Watts , 2000; Kettle et al , 2002; J. Liu et al , 2007]. Kaolinite can also be used as a real or model soil sample.…”