Using inductively coupled plasma mass spectrometry(ICP-MS)to detect the Pb content in the multi-phase medium(water,sediment and large benthic organisms)in the artificial reef areas of Bohai Bay in Tianjin to analysis ...Using inductively coupled plasma mass spectrometry(ICP-MS)to detect the Pb content in the multi-phase medium(water,sediment and large benthic organisms)in the artificial reef areas of Bohai Bay in Tianjin to analysis its spatial distribution characteristics and potential ecological risk.Using different evaluation methods.The results showed that:the Pb content is varied from 0.003-0.024μg/L,mean 0.008±0.007μg/L,the highest values appear in the No.9 station;the minimum value is 5 stations.Pb content of sediment is varied from 0.003-0.024μg/L,mean 0.008±0.007μg/L,the highest values appear in the No.9 station;the minimum value is 5 stations.The vertical sediment distribution of Pb decreased in the order:lower>middle>upper layer in each station.Risk evaluation showed that potential ecological risk index of Pb is low in the reef sediments;accumulate partial index is belong to moderate pollution levels;enrichment factor is belong to the light^pollution-free.Pb content of organisms is rang from 0.004-0.519 mg/kg,mean 0.185±0.170 mg/kg in reef area;BCF value of Pb content in organisms is generally higher than BAF value;its health risk factor is far less than 1,indicating that Pb has no obvious health risks on exposure population.展开更多
Urbanization may cause increased exposure levels to polycyclic aromatic hydrocarbons （PAHs） and associated health risks for over half of the world＇s population living in cities, but little evidence has shown a dire...Urbanization may cause increased exposure levels to polycyclic aromatic hydrocarbons （PAHs） and associated health risks for over half of the world＇s population living in cities, but little evidence has shown a direct spatial relationship between urbanization and soil PAH pollution. Based on the monitored PAH concentrations in 188 topsoil （0-5 cm） samples in Shenzhen, the most rapidly developing city in China, in recent decades, we applied geographical demarcation to determine the occurrences, source apportionments, and spatial ecological risks of soil PAHs across five zones of varying urban densities. Mean concentrations of the 16 US Environmental Protection Agency （EPA） priority PAHs （∑16PAHs） and the 7 carcinogenic PAHs （2E7CarPAHs） both followed the order： Zone D （60%-80% constructive land density （CLD）） 〉 Zone E （80%-100% CLD） 〉 Zone C （40%-60% CLD） 〉 Zone B （20%-40% CLD） 〉 Zone A （0%-20% CLD）, suggesting that the highest PAH levels occurred in the suburban-urban center transitional zone （Zone D） rather than the urban center zone （Zone E） in Shenzhen. There were significant correlations of ∑16PAHs to TOC and sampling altitude across all samples but not within highly-urbanized regions （Zones D and E）, implying a considerable disturbance of urbanization to the soil PAH pool. Source apportionments suggested that soil PAHs of all zones were mainly derived from fossil fuel combustion, with Zone E showing the highest contribution from oil sources among different zones. Spatial ecological risk analysis showed that the contaminated area （467 km2; 23.9% of total area; toxic equivalency quotients 〉 33 ng g^-1） had a higher contribution from the highly-urbanized regions （Zones D and E） than the uncontaminated area （42.3% vs. 18.1%）. Overall, our study highlighted a strong spatial relationship between urbanization and soil PAH pollution.展开更多
基金supported by the following funds,Monitoring and evaluation of Marine fishery resources restoration,proliferation and discharge in the 100 000 tons roadway project of Dagang port area of Tianjin portMarine fishery resources restoration of Tianjin liquefied natural gas (LNG) project+1 种基金Youth science and technology innovation project of Tianjin municipal bureau of aquatic industry (J-2014-08)Tianjin agricultural science and technology achievements transformation and promotion project (201304150)
文摘Using inductively coupled plasma mass spectrometry(ICP-MS)to detect the Pb content in the multi-phase medium(water,sediment and large benthic organisms)in the artificial reef areas of Bohai Bay in Tianjin to analysis its spatial distribution characteristics and potential ecological risk.Using different evaluation methods.The results showed that:the Pb content is varied from 0.003-0.024μg/L,mean 0.008±0.007μg/L,the highest values appear in the No.9 station;the minimum value is 5 stations.Pb content of sediment is varied from 0.003-0.024μg/L,mean 0.008±0.007μg/L,the highest values appear in the No.9 station;the minimum value is 5 stations.The vertical sediment distribution of Pb decreased in the order:lower>middle>upper layer in each station.Risk evaluation showed that potential ecological risk index of Pb is low in the reef sediments;accumulate partial index is belong to moderate pollution levels;enrichment factor is belong to the light^pollution-free.Pb content of organisms is rang from 0.004-0.519 mg/kg,mean 0.185±0.170 mg/kg in reef area;BCF value of Pb content in organisms is generally higher than BAF value;its health risk factor is far less than 1,indicating that Pb has no obvious health risks on exposure population.
基金supported by the "Laboratory Capacity Building Project" of Shenzhen Municipal Science and Technology Innovation Council, China (No. ZDSY20120614145024623)the State Key Program of National Natural Science of China (No. 41230634)
文摘Urbanization may cause increased exposure levels to polycyclic aromatic hydrocarbons （PAHs） and associated health risks for over half of the world＇s population living in cities, but little evidence has shown a direct spatial relationship between urbanization and soil PAH pollution. Based on the monitored PAH concentrations in 188 topsoil （0-5 cm） samples in Shenzhen, the most rapidly developing city in China, in recent decades, we applied geographical demarcation to determine the occurrences, source apportionments, and spatial ecological risks of soil PAHs across five zones of varying urban densities. Mean concentrations of the 16 US Environmental Protection Agency （EPA） priority PAHs （∑16PAHs） and the 7 carcinogenic PAHs （2E7CarPAHs） both followed the order： Zone D （60%-80% constructive land density （CLD）） 〉 Zone E （80%-100% CLD） 〉 Zone C （40%-60% CLD） 〉 Zone B （20%-40% CLD） 〉 Zone A （0%-20% CLD）, suggesting that the highest PAH levels occurred in the suburban-urban center transitional zone （Zone D） rather than the urban center zone （Zone E） in Shenzhen. There were significant correlations of ∑16PAHs to TOC and sampling altitude across all samples but not within highly-urbanized regions （Zones D and E）, implying a considerable disturbance of urbanization to the soil PAH pool. Source apportionments suggested that soil PAHs of all zones were mainly derived from fossil fuel combustion, with Zone E showing the highest contribution from oil sources among different zones. Spatial ecological risk analysis showed that the contaminated area （467 km2; 23.9% of total area; toxic equivalency quotients 〉 33 ng g^-1） had a higher contribution from the highly-urbanized regions （Zones D and E） than the uncontaminated area （42.3% vs. 18.1%）. Overall, our study highlighted a strong spatial relationship between urbanization and soil PAH pollution.
