[Distribution characteristics of trace pollutants in benthic mussels from the coastal areas of Bohai Sea and North Yellow Sea].

Based on the recent monitoring results, the concentration and distribution of persistent toxic substances in the benthic mussels from the coastal areas of Bohai Sea and North Yellow Sea were determined. The results indicated that, at over 36% of the total sampling sites, the tissue concentrations of petroleum hydrocarbons were higher than the Category I value (15 microg/g, wet weight) of the national marine biological quality standards, especially at the sites near Dalian Bay and Xincun in Hebei Province, the tissue concentrations even exceeded the Category III level (80 microg/g, wet weight). Moreover, higher tissue concentration of PHCs (over the Category I level) during recent years remained in the most monitoring sea areas.

[Inhalation exposure assessment on gaseous PAHs in indoor air of folk houses in Beijing].

Seven gaseous polycyclic aromatic hydrocarbons (PAHs) were determined in the indoor air of 38 folk houses in Beijing during the heating and non-heating seasons, by the passive air samplers. The total average concentration of the gaseous PAHs was around 100 ng/m3, and the dominant components were those with 2 or 3 rings. The inhalation exposure of PAHs by the residents was calculated based on the concentrations of PAHs acquired, average house-staying time and respiratory rates at different ages.

[Concentrations and influencing factors of gaseous polycyclic aromatic hydrocarbons in residential air in Beijing].

7 gas phase PAHs components in indoor air collected from 38 families were investigated by modified passive air samplers in Beijing areas during the local heating and non-heating seasons, and the influencing factors were discussed as well. The analytical results indicate that the gasous PAHs in local indoor air are dominated by 2 and 3 rings compounds, the mean concentrations for the 7 individual gaseous components range from 1 to 40 ng/m3, and the average concentration of total gaseous PAHs is about 100 ng/m3. There is no significant difference in total gaseous PAHs concentrations between the heating and the non-heating seasons, while some apparent seasonal changes occur in ACY and FLA concentrations.