Bohai Bay, a typical semi-enclosed bay, is close to the Beijing-Tianjin-Hebei Region, the economi... more Bohai Bay, a typical semi-enclosed bay, is close to the Beijing-Tianjin-Hebei Region, the economic center of north China. The release of emerging contaminants was considerably increasing with the fast urbanization and industrialization along the coastline. However, such data, e.g. plastic polymers, are still limited. Here, polyethylene terephthalate (PET) and di-(2-ethylhexyl) phthalate (DEHP) in surface sediments and sediment cores from the coastal area of Bohai Bay were investigated. The ranges of PET and DEHP concentrations in surface sediments are 1.49-13.90 mg/kg and 0.23-19.26 mg/kg, respectively. The relatively high contents of PET and DEHP were found near the Haihe River estuary, indicating the importance of riverine input. The PET and DEHP profiles in the cores dated by the 210Pb method showed increasing trends with time. The PET in Bohai Bay was low risk evaluated by the potential ecological risk assessment. Low ecological risks of DEHP to the benthic organisms were found in the sediments, using the environmental risk limits, risk quotient, threshold effect level and probable effect level methods. The pollution levels of PET and DEHP in Bohai Bay obtained in this study may provide important data for making pollution control strategies.
Spatiotemporal distribution and ecological risk of the polyethylene terephthalate (PET) plastic p... more Spatiotemporal distribution and ecological risk of the polyethylene terephthalate (PET) plastic polymer and plasticizer di-(2-ethylhexyl) phthalate (DEHP) were investigated using both surface and core sediments in Jiaozhou Bay, China. The concentrations of PET and DEHP ranged 210.6-1929.7 μg/kg and 0-591.2 μg/kg, respectively. The depth profiles of PET and DEHP in the sediment cores indicated that PET and DEHP pollution increased since the 1970s, which is in accord with the regional PET and DEHP consumption history. The levels of PET in Jiaozhou Bay was found to represent low ecological risk based on the assessment models for Potential Ecological Risk factor and Potential Ecological Risk. The amounts of DEHP also posed a low risk to the aquatic organisms in the sediment phase as indicated by the Risk Quotient method.
Dissolved natural organic matter (DNOM) governs important processes in the environment. These pro... more Dissolved natural organic matter (DNOM) governs important processes in the environment. These processes need to be understood and accounted for in order to predict effects of anthropogenic pressure on the environmental. The main challenges dealing with humic substances (HS) is its heterogeneous nature and the spatial and
Due to its small size, large specific surface area and hydrophobicity, microplastics, and the ads... more Due to its small size, large specific surface area and hydrophobicity, microplastics, and the adsorbed contaminants may together cause potential negative effects on ecosystems and human beings. In this study, kinetics and size effects on adsorption of Cu(II), Cr(III), and Pb(II) onto PE, PP and PET microplastic particles were explored. Results indicated that the PE and PET microplastics have the higher adsorption capacity for Cu(II), Cr(III), and Pb(II) than that for PP microplastic. The adsorption capacity was affected by microplastic types and metal species. Among the three metals, Pb(II) had the largest adsorption amount on microplastic particles, especially on PET particles. Moreover, the adsorption capacities of microplastics increase with the decrease of particle size. The metal adsorption capacity of <0.9 mm microplastics is greater than that of 0.9–2 mm and 2–5 mm microplastics. The size effect on metal adsorption was largest for PE microplastic. More attention should be ...
Chinese Journal of Urban and Environmental Studies, 2017
The paper analyzes the role of information–knowledge for making farming environmentally friendly,... more The paper analyzes the role of information–knowledge for making farming environmentally friendly, using eutrophication of the main drinking water reservoir of Tianjin, China as a case. The analysis considers information and instruction sources used by farmers in relation to their farming and environmental issues, in particular application of fertilizers, and on this basis it discusses governance and policy measures. The study is interdisciplinary, covering both natural and social sciences, and it is based on quantitative methodology, employing descriptive and multivariate statistical methods. The main findings are: (i) farmers make use of a broad range of information and instruction sources, thereby confirming the claim that eutrophication and hence good farming practices are a “wicked” problem; (ii) the young and the members of the Communist Party are more active than others in using a broad range of information and instruction sources; (iii) different categories of farmers give pr...
... layers. It may prove necessary to include at least three sub-compartments in the model, each ... more ... layers. It may prove necessary to include at least three sub-compartments in the model, each with its own Al-solubility control. References Bloom. PR, McBride, MB & Weaver, RM 1979 Soil Sci. Soc. Am. J. 43, 488-493. Driscoll. ...
Hydrogeochemical processes in the Birkenes catchment BY NILS CHRISTOPHERSEN1, MlCHAKL HAUHS2, JAN... more Hydrogeochemical processes in the Birkenes catchment BY NILS CHRISTOPHERSEN1, MlCHAKL HAUHS2, JAN MULDER3t. HANS M. SEIP" AND ROLF D. VOGT* 1 Center for Industrial Research. PO Box 124 Blindern, N-0314 Oslo 3, Norway " Department of Soil Science ...
Dissolved Natural Organic Matter (DNOM) is a heterogeneous mixture of partly degraded, oxidised a... more Dissolved Natural Organic Matter (DNOM) is a heterogeneous mixture of partly degraded, oxidised and resynthesised organic compounds of terrestrial or aquatic origin. In the boreal biome, it plays a central role in element cycling and practically all biogeochemical processes governing the physico-chemistry of surface waters. Because it plays a central role in multiple aquatic processes, especially microbial respiration, an improved understanding of the biodegradability of the DNOM in surface water is needed. Here the current study, we used a relatively cheap and non-laborious analytical method to determine the biodegradability of DNOM, based on the rate and the time lapse at which it is decomposed. This was achieved by monitoring the rate of oxygen consumption during incubation with addition of nutrients. A synoptic method study, using a set of lake water samples from southeast Norway, showed that the maximum respiration rate (RR) and the normalised RR (respiration rate per unit of c...
Bohai Bay, a typical semi-enclosed bay, is close to the Beijing-Tianjin-Hebei Region, the economi... more Bohai Bay, a typical semi-enclosed bay, is close to the Beijing-Tianjin-Hebei Region, the economic center of north China. The release of emerging contaminants was considerably increasing with the fast urbanization and industrialization along the coastline. However, such data, e.g. plastic polymers, are still limited. Here, polyethylene terephthalate (PET) and di-(2-ethylhexyl) phthalate (DEHP) in surface sediments and sediment cores from the coastal area of Bohai Bay were investigated. The ranges of PET and DEHP concentrations in surface sediments are 1.49-13.90 mg/kg and 0.23-19.26 mg/kg, respectively. The relatively high contents of PET and DEHP were found near the Haihe River estuary, indicating the importance of riverine input. The PET and DEHP profiles in the cores dated by the 210Pb method showed increasing trends with time. The PET in Bohai Bay was low risk evaluated by the potential ecological risk assessment. Low ecological risks of DEHP to the benthic organisms were found in the sediments, using the environmental risk limits, risk quotient, threshold effect level and probable effect level methods. The pollution levels of PET and DEHP in Bohai Bay obtained in this study may provide important data for making pollution control strategies.
Spatiotemporal distribution and ecological risk of the polyethylene terephthalate (PET) plastic p... more Spatiotemporal distribution and ecological risk of the polyethylene terephthalate (PET) plastic polymer and plasticizer di-(2-ethylhexyl) phthalate (DEHP) were investigated using both surface and core sediments in Jiaozhou Bay, China. The concentrations of PET and DEHP ranged 210.6-1929.7 μg/kg and 0-591.2 μg/kg, respectively. The depth profiles of PET and DEHP in the sediment cores indicated that PET and DEHP pollution increased since the 1970s, which is in accord with the regional PET and DEHP consumption history. The levels of PET in Jiaozhou Bay was found to represent low ecological risk based on the assessment models for Potential Ecological Risk factor and Potential Ecological Risk. The amounts of DEHP also posed a low risk to the aquatic organisms in the sediment phase as indicated by the Risk Quotient method.
Dissolved natural organic matter (DNOM) governs important processes in the environment. These pro... more Dissolved natural organic matter (DNOM) governs important processes in the environment. These processes need to be understood and accounted for in order to predict effects of anthropogenic pressure on the environmental. The main challenges dealing with humic substances (HS) is its heterogeneous nature and the spatial and
Due to its small size, large specific surface area and hydrophobicity, microplastics, and the ads... more Due to its small size, large specific surface area and hydrophobicity, microplastics, and the adsorbed contaminants may together cause potential negative effects on ecosystems and human beings. In this study, kinetics and size effects on adsorption of Cu(II), Cr(III), and Pb(II) onto PE, PP and PET microplastic particles were explored. Results indicated that the PE and PET microplastics have the higher adsorption capacity for Cu(II), Cr(III), and Pb(II) than that for PP microplastic. The adsorption capacity was affected by microplastic types and metal species. Among the three metals, Pb(II) had the largest adsorption amount on microplastic particles, especially on PET particles. Moreover, the adsorption capacities of microplastics increase with the decrease of particle size. The metal adsorption capacity of <0.9 mm microplastics is greater than that of 0.9–2 mm and 2–5 mm microplastics. The size effect on metal adsorption was largest for PE microplastic. More attention should be ...
Chinese Journal of Urban and Environmental Studies, 2017
The paper analyzes the role of information–knowledge for making farming environmentally friendly,... more The paper analyzes the role of information–knowledge for making farming environmentally friendly, using eutrophication of the main drinking water reservoir of Tianjin, China as a case. The analysis considers information and instruction sources used by farmers in relation to their farming and environmental issues, in particular application of fertilizers, and on this basis it discusses governance and policy measures. The study is interdisciplinary, covering both natural and social sciences, and it is based on quantitative methodology, employing descriptive and multivariate statistical methods. The main findings are: (i) farmers make use of a broad range of information and instruction sources, thereby confirming the claim that eutrophication and hence good farming practices are a “wicked” problem; (ii) the young and the members of the Communist Party are more active than others in using a broad range of information and instruction sources; (iii) different categories of farmers give pr...
... layers. It may prove necessary to include at least three sub-compartments in the model, each ... more ... layers. It may prove necessary to include at least three sub-compartments in the model, each with its own Al-solubility control. References Bloom. PR, McBride, MB & Weaver, RM 1979 Soil Sci. Soc. Am. J. 43, 488-493. Driscoll. ...
Hydrogeochemical processes in the Birkenes catchment BY NILS CHRISTOPHERSEN1, MlCHAKL HAUHS2, JAN... more Hydrogeochemical processes in the Birkenes catchment BY NILS CHRISTOPHERSEN1, MlCHAKL HAUHS2, JAN MULDER3t. HANS M. SEIP" AND ROLF D. VOGT* 1 Center for Industrial Research. PO Box 124 Blindern, N-0314 Oslo 3, Norway " Department of Soil Science ...
Dissolved Natural Organic Matter (DNOM) is a heterogeneous mixture of partly degraded, oxidised a... more Dissolved Natural Organic Matter (DNOM) is a heterogeneous mixture of partly degraded, oxidised and resynthesised organic compounds of terrestrial or aquatic origin. In the boreal biome, it plays a central role in element cycling and practically all biogeochemical processes governing the physico-chemistry of surface waters. Because it plays a central role in multiple aquatic processes, especially microbial respiration, an improved understanding of the biodegradability of the DNOM in surface water is needed. Here the current study, we used a relatively cheap and non-laborious analytical method to determine the biodegradability of DNOM, based on the rate and the time lapse at which it is decomposed. This was achieved by monitoring the rate of oxygen consumption during incubation with addition of nutrients. A synoptic method study, using a set of lake water samples from southeast Norway, showed that the maximum respiration rate (RR) and the normalised RR (respiration rate per unit of c...
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