Organic contamination in the greenhouse soils from Beijing suburbs, China

Abstract

Selected persistent organic pollutants including HCHs, DDTs and PAHs together with PAEs were determined in the greenhouse soils from Beijing suburbs. The total concentrations were 11.64-29.80 ng g 21 for HCHs, 18.04-101.33 ng g 21 for DDTs, 1.34-3.15 mg g 21 for PAEs and 1.92-7.84 mg g 21 for PAHs, respectively. Predominance of b-HCH in all samples was obviously observed, suggesting a lack of new HCHs sources. High concentrations of DDE and DDD in comparison to their parents in the samples indicated that most of the DDT had been transformed into its metabolites. The contamination of PAHs was relatively serious and the most abundant compounds were 4-, 5-and 6-ring unsubstituted PAHs. The profiles reflect the important effect of traffic on the PAHs remaining in greenhouse soils. Three phthalate esters (DIBP, DnBP and DEHP) accounted for more than 97% of the phthalates studied. Analysis of n-alkanes was also performed in order to trace the natural or anthropogenic sources of hydrocarbons. Characterization and identification of these compounds in greenhouse soil may help in development of strategies to be used in monitoring organic pollutants in this region.

Polycyclic aromatic hydrocarbons contamination in subsoil from outskirts of Beijing, People's Republic of China

“…The detailed procedure of extraction and clean-up was presented in the previous works Ma et al, 2003). After 1 ml of 2-flurobiphenyl (4.0 Ag ml À1 ) was added as surrogate for PAHs analysis and 1 ml of 2,4,5,6-tetrachloro-m-xylene (0.4 Ag ml À1 ) for organochlorine pesticides analysis, accurately weighed soil sample (about 10 g) was extracted by ultrasonic in 30 ml acetone/petroleum ether (1:1) thrice during 15 min followed and separated by centrifugation.…”

“…This may result in high concentrations of PAHs in soils. Up to now, only limited attentions on a small scale were paid to the accumulation and distribution of PAHs in Beijing soils Ma et al, 2003). In 2001, the Chinese government carried out a systematic and tremendous investigation to assess the state of soil contamination on the outskirts of Beijing where there are undergoing great changes due to the rapid urbanization and industrial development.…”

“…There is a lack of more information on the state of the contamination of the environment especially in soils with PAHs in China Ma et al, 2003;Tao et al, 2004;Wang et al, 2003). Beijing, the capital of China, is one of the economic and culture center of China.…”

Polycyclic aromatic hydrocarbons in the surface soils from outskirts of Beijing, China

“…Therefore, it is urgent to investigate PAHs in the environment of Beijing. By now, scarce research concerned about PAHs in the Beijing soils Ma et al, 2003).…”

Residues of organochlorine pesticides in surface soils from college school yards in Beijing, China

“…Some of OCPs are even identified as endocrine disrupting pesticides by USEPA (1998). OCPs were well documented in urban and suburban soils of Beijing (Ma et al, 2003;Zhu et al, 2005Li et al, 2006Li et al, , 2008, but few researches have ever been conducted on soils in college school yards.…”