Trace organic compounds in rain—III. Particle scavenging of neutral organic compounds

Significance of wet deposition to removal of atmospheric particulate matter and polycyclic aromatic hydrocarbons: A case study in Guangzhou, China

“…2 and 3; Table S4), i.e., air quality may have been better during the wet weather season than during the dry weather season in 2010. This conclusion has been widely supported by previous studies (Likens et al, 1983;Ollivon et al, 2002;Sun et al, 2006;Orlovic-Leko et al, 2009). This seasonal variance appeared to associate with dilution effects (Pan et al, 2010), because precipitation amounts were negatively correlated with PM, TOC and S 15 PAH concentrations in the present study.…”

“…The annual C VWM of POC (1.3 mg L À1 ) was higher than the levels obtained from forestry and semi-rural regions in the United States, i.e., 0.20 mg L À1 in Hubbard Brook of New York (Likens et al, 1983) and 0.73 mg L À1 in Wilmington of North Carolina (Kieber et al, 2006). Similarly, the annual C VWM of DOC (1.4 mg L À1 ) in the present study was lower than other measurements conducted in urban and forest regions in North America and Asia, i.e., 1.9 mg L À1 in Ithaca of New York (Likens et al, 1983), 3.0 mg L À1 in North China (Pan et al, 2010), 3.6 mg L À1 in Guangzhou (Xu et al, 2008), 6.7 mg L À1 in Los Angeles (Kawamura et al, 2001), and 6.8 and 2.1 mg L À1 (spring and summer) in Xi'an of China (Tian et al, 2011), but higher than those in coastal areas in north America (1.1 mg L À1 ) (Likens et al, 1983).…”

Occurrence, phase distribution and depositional intensity of dichlorodiphenyltrichloroethane (DDT) and its metabolites in air and precipitation of the Pearl River Delta, China

“…K (Table 1). On the other hand, chemicals affiliated with particles in air are supposed to be adequately scavenged (Ligocki et al, 1985;Rounds et al, 1993); therefore, W P equals to the ratio of the chemical concentration in precipitation to that in aerial particles (Table 1). With all these considerations, W T is calculated by…”

Air-sea interactions of semi-volatile organic compounds in the tropical environment of Southeast Asia

“…It is generally assumed that equilibrium is attained rapidly between the vapor phase and the dissolved phase in a raindrop [88]. It has been estimated that equilibrium can be established with the surrounding vapor phase during the time it takes a raindrop to fall a few meters [89,90]. Therefore, vapor washout ratio, W G , has been estimated using air-water equilibrium partition coefficients or Henry's Law contant:…”