Identification of sensitive parameters in the modeling of SVOC reemission processes from soil to atmosphere

Does the Geographic Difference of Soil Properties Matter for Setting Up the Soil Screening Levels in Large Countries Like China?

“…Notably, we found that the risk of oral ingestion (R1), dermal adsorption (R2), and inhalation of fugitive dust (R3) was unchanged, indicating that soil properties had no effects on these pathways; however, soil properties did have significant impacts on the inhalation of indoor vapors (R4) of more than one order difference from the 25th to 75th percentile on the risk boxes and about four orders of magnitude difference from the minimum to the maximum. The soil properties had no effects on the derivation of the SSLs of heavy metals (arsenic and cadmium) since the heavy metals posed no risk of indoor vapor inhalation (R4). − They also had insignificant impacts on the SSLs of SVOCs (PCB126, β-HCH, and BaP) , since SVOCs have two to five orders of magnitude lower exposure for inhalation than for oral ingestion; however, the soil properties indicated a great impact on the derivation of VOCs SSLs because the vapor inhalation exposure pathway contributed the largest proportion of the risk. The relative importance of different exposure pathways depends on the physicochemical properties of the specific chemicals …”

Modeling short-term concentration fluctuations of semi-volatile pollutants in the soil–plant–atmosphere system

“…The atmospheric boundary layer was implemented in the model as described previously (refer to details in Bao et al, 2015). A 5-mm thick stagnant air layer (Jury et al, 1983;McKone, 1996;Loizeau et al, 2014) was used above ground, within which effective gas diffusion changes from pure diffusion in the soil to eddy diffusion in the atmosphere. As an example, the vertical profile of effective gas and eddy diffusion coefficients for PCB-52 across the soil-atmosphere interface is presented in Fig.…”

“…Commonly, numerical models are used to investigate temperaturedriven soil-plant-atmosphere exchange of SVOCs by simulating sorption and diffusion in soils, partitioning to plants, and the temperature dependence of these processes (Cousins et al, 1999;Prevedouros et al, 2000;Hung et al, 2001;Scholtz et al, 2002aScholtz et al, , 2002bDalla Valle et al, 2004;MacLeod and Mackay, 2004;van den Berg and Leistra, 2004;Wegmann et al, 2004;MacLeod et al, 2007;Gasic et al, 2009;Collins and Finnegan, 2010;Morselli et al, 2011;Garcia et al, 2014;Loizeau et al, 2014;Trapp, 2015;Bao et al, 2015;Lichiheb et al, 2016). For instance, several models (i.e.…”

“…For instance, several models (i.e. Cousins et al, 1999;Scholtz et al, 2002aScholtz et al, , 2002bGasic et al, 2009;Loizeau et al, 2014;Bao et al, 2015) have addressed soil-atmosphere exchange of SVOCs (two compartments; without plants) considering integrated physico-chemical parameters. Previous studies (i.e.…”