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Zhang Y.,Tianjin Academy of Environmental science | Zhang Y.,Tianjin Key Laboratory for Water Pollution Control and Ecological Restoration | Lu X.,Tianjin Academy of Environmental science | Lu X.,Tianjin Key Laboratory for Water Pollution Control and Ecological Restoration | And 7 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2015

Metal concentration in marine sediments is influenced by sedimentation rate. In this study, the metal concentration in sediments of Bohai Bay, China, was adjusted by sedimentation rate, which was derived from the radionuclide dating method. The results showed that the sedimentation rate of Bohai Bay sediments increased from 0.3 to 0.55 g/a over time, especially in the last 30 years since the economic reform in China. The sequence of metal concentrations (mg/kg) is: Cr(97.41) > Zn(73.14) > Cu(20.59) > Pb(16.42) > Cd(0.49). Through the adjustment, the change of metal concentration in sediment cores increased obviously from bottom to surface sediments. It indicated that the increasing sedimentation rate of Bohai Bay in recent years diluted the metal concentration in the sediment. © 2015 Springer Science+Business Media New York. Source


Yu B.-H.,Tianjin Normal University | Liu H.-L.,Tianjin Academy of Environmental science | Lu X.-Q.,Tianjin Academy of Environmental science | Wang Z.-L.,Tianjin Normal University | And 6 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2013

Fourteen surface sediment samples were collected from the inner Bohai Bay (Tianjin coastal sea) to measure particle size, heavy metal and radioactivity. The sediments were majorly silt-size and the particle size decreases southwards and eastwards in study area. The ranges of heavy metal concentrations were 25.6~35.1 mg/kg, 44.1~67.7 mg/kg and 60~73.5 mg/kg for Cu, Pb, Zn, respectively. The radioactivities for 210Pb and 137Cs were 13.2~35.3 Bq/kg and 0.05~1.28 Bq/kg, respectively. Heavy metals concentration and radioactivity decreases with the increase of particle size, and generally increases both from north to south spatially. In particular, the level of heavy metals and radioactivity in the central and southern area increases southeastwardly and eastwardly, respectively. That might be due to the fact that the fine particles are more effective in adsorbing metals than coarse particles, and the surface sediment particle size distribution can be affected by flow in Bohai bay. Source


Lu X.,Tianjin Academy of Environmental science | Zhang Y.,Tianjin Academy of Environmental science | Liu H.,Tianjin Academy of Environmental science | Xing M.,Tianjin Academy of Environmental science | And 7 more authors.
Marine Pollution Bulletin | Year: 2014

The influence of early diagenesis on the vertical distribution of metal forms in the sediments of Bohai Bay was discussed in this paper. The results showed that the concentrations were: Al. >. Fe. ≈. Ca. >. Mn. >. Cr. >. Zn. >. Cu. >. Pb. >. Cd. In vertical distribution, the forms of Cr and Pb were stable from the top to the bottom. However, the exchangeable forms and acid-extracted forms of Cd, Cu and Zn presented an obvious declining trend. The metals would be transformed to more stable forms during the early-diagenesis process. Further analysis found that early diagenesis can change the sedimentary environment, affecting pH, oxidation-reduction potential (ORP), total dissolved solid (TDS) and the structure of organic matter (OM), all main factors influencing metal forms in the sediments of Bohai Bay. © 2014 Elsevier Ltd. Source

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