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Guo J.-T.,Tianjin Normal University | Guo J.-T.,CAS Shenyang Institute of Applied Ecology | Zhou J.,Tianjin Land Subsidence Control Office | Hu B.-B.,Tianjin Normal University | And 3 more authors.
Chinese Journal of Ecology | Year: 2014

Samples of surface dust were collected from 41 representative urban parks in Tianjin. The health risk of heavy metals in surface dust was evaluated using human health risk assessment model established by U. S. EPA. The results showed that the pollution of heavy metals was serious. The average concentrations of Cu, Pb, Cr, Cd and Ni in the samples were 113. 18, 63. 32, 103. 18, 1. 14 and 40. 58 mg·kg-1 respectively, which all exceeded the background values in the soils of Tianjin. The direct ingestion of dust via hand-mouth contact behaviors was the major exposure pathway for health risk and the amount of chronic daily average exposure was in order of hand-mouth direct ingestion > dermal uptake > inhalation. The non-cancer risk of exposure was Cr > Pb > Cu > Ni > Cd, while the cancer risk of exposure was Ni > Cr > Cd. Non-cancer risk was higher for children than for adults. All the risks were lower than the average risk thresholds of the heavy metals, and would not cause non-carcinogenic or carcinogenic health hazard to human body, while its potential ecological hazard on children should be considered.

Hu B.,Tianjin Normal University | Zhou J.,Tianjin Land Subsidence Control Office | Xu S.,East China Normal University | Chen Z.,East China Normal University | And 5 more authors.
Natural Hazards | Year: 2013

Land subsidence, a major geological hazard in Tianjin, has caused serious losses. In this research, we established a numerical model to predict potential land subsidence caused by groundwater overdraft in the next decades. The model set three groundwater extraction scenarios, corresponding to (1) current rate, (2) 2 % decrease, and (3) South-to-North Water Transfer Project. Economic losses induced by land subsidence were calculated based on the three land subsidence scenarios. The results showed that with a better management plan (e. g., 2 % decrease in groundwater extraction) or with the success of the water transfer project, the economic loss could be reduced by 36 % or even 74 %. The results of this research provide a scientific basis for the sustainable development planning as well as disaster prevention policy-making of Tianjin Binhai New Area. © 2013 Springer Science+Business Media Dordrecht.

Wu Z.-L.,Tianjin Normal University | Zhou J.,Tianjin Land Subsidence Control Office | Hu B.-B.,Tianjin Normal University | Wang Z.-L.,Tianjin Normal University | And 2 more authors.
Chinese Journal of Ecology | Year: 2013

Dust and soil samples were taken from 41 parks in inner-city of Tianjin and 10 parks in Tianjin Binhai New Area to study the physicochemical properties and contents of heavy metals in the samples, with the special distribution patterns and possible sources of the heavy metals analyzed. In the parks, the particle sizes of dusts and soils presented bi- or multi-modal distribution, the organic matter content in the dusts and soils was averagely 49. 10 and 27. 15 g · kg-1, and the Cu, Pb, Cr, Cd, and Ni contents in the dusts and soils were averagely 113. 88, 76. 81, 141. 53, 1. 30, and 114. 70 mg · kg-1, and 41. 68, 30. 76, 96. 43, 1. 01, and 34.03 mg · kg-1, respectively, being much higher than the background values in Tianjin. The Heping District, northeastern part of Nankai District, and Hexi District were less polluted by the heavy metals. Pearson correlation analysis and principal component analysis indicated that organic matter was the main carrier of Cd, while traffic flux and industrial activities were the main pollution sources of Cr, Ni, Cu, and Pb.

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