The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Ming Hung Wong - One of the best experts on this subject based on the ideXlab platform.

  • Bacterial communities in PAH contaminated soils at an electronic-Waste Processing center in China
    Ecotoxicology, 2009
    Co-Authors: Wen Zhang, Hui Wang, Rui Zhang, Xiezhi Yu, Pei-yuan Qian, Ming Hung Wong
    Abstract:

    Surface soils from Guiyu, China (an intense e-Waste Processing center) were analyzed for persistent organic pollutants (POPs) and variations in composition of the resident bacterial communities. Denaturing Gradient Gel Electrophoresis analysis of bacterial 16S rRNA gene showed that e-Waste pollution altered the bacterial community structure by promoting changes in species composition and species richness. Bacterial diversity was not decreased at e-Waste open-burning sites, compared with a non e-Waste site (reservoir site), due to flourishing of possible POPs-consuming bacterial cohorts. PAH-incubated experiments confirmed that different levels of PAHs might affect the bacterial community by suppressing or favoring certain groups of bacteria, for instance, uncultured Clostridium sp. and Massilia sp., respectively. Taxonomic analysis indicated β-proteobacteria and Firmicutes were abundant bacterial lineages in PAH-polluted soils. This study is the first reporting bacterial community structures at e-Waste Processing sites, and indicated that crude Processing of e-Waste has become a biohazard to the terrestrial environment warranting more extensive studies of microbial communities at e-Waste polluted environments.

  • evidence of excessive releases of metals from primitive e Waste Processing in guiyu china
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Nurdan S Duzgorenaydin, A Aydin, Ming Hung Wong
    Abstract:

    Abstract Guiyu, China is infamous for its involvement in primitive e-Waste Processing and recycling activities. Freshwater samples were collected in and outside of Guiyu for dissolved metal analysis. It was found that dissolved metal concentrations were higher in Lianjiang and Nanyang River within Guiyu than the reservoir outside of Guiyu. Lianjiang was enriched with dissolved As, Cr, Li, Mo, Sb and Se, while Nanyang River had elevated dissolved Ag, Be, Cd, Co, Cu, Ni, Pb and Zn. Temporal distributions of the metals suggested recent discharges of metals attributable to a strong acid leaching operation of e-Waste, where dissolved Ag, Cd, Cu and Ni (0.344 ± 0.014, 0.547 ± 0.074, 87.6 ± 3.0 and 93.0 ± 1.4 μg/L, respectively) were significantly elevated. Pb isotopic composition of dissolved Pb confirmed that more than one non-indigenous Pb were present in Lianjiang and Nanyang River. In summary, it was evident that the riverine environment of Guiyu was heavily impacted by e-Waste related activities.

  • Evidence of excessive releases of metals from primitive e-Waste Processing in Guiyu, China
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Adnan Aydin, Nurdan S. Duzgoren-aydin, Ming Hung Wong
    Abstract:

    Guiyu, China is infamous for its involvement in primitive e-Waste Processing and recycling activities. Freshwater samples were collected in and outside of Guiyu for dissolved metal analysis. It was found that dissolved metal concentrations were higher in Lianjiang and Nanyang River within Guiyu than the reservoir outside of Guiyu. Lianjiang was enriched with dissolved As, Cr, Li, Mo, Sb and Se, while Nanyang River had elevated dissolved Ag, Be, Cd, Co, Cu, Ni, Pb and Zn. Temporal distributions of the metals suggested recent discharges of metals attributable to a strong acid leaching operation of e-Waste, where dissolved Ag, Cd, Cu and Ni (0.344 ± 0.014, 0.547 ± 0.074, 87.6 ± 3.0 and 93.0 ± 1.4 μg/L, respectively) were significantly elevated. Pb isotopic composition of dissolved Pb confirmed that more than one non-indigenous Pb were present in Lianjiang and Nanyang River. In summary, it was evident that the riverine environment of Guiyu was heavily impacted by e-Waste related activities. © 2006 Elsevier Ltd. All rights reserved.

  • trace metal contamination of sediments in an e Waste Processing village in china
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Shengchun Wu, Nurdan S Duzgorenaydin, A Aydin, Ming Hung Wong
    Abstract:

    Abstract This study examined trace metal contamination of sediments in Guiyu, China where primitive e-Waste Processing activities have been carried out. It was found that some river sediments in Guiyu were contaminated with Cd (n.d.–10.3 mg/kg), Cu (17.0–4540 mg/kg), Ni (12.4–543 mg/kg), Pb (28.6–590 mg/kg), and Zn (51.3–324 mg/kg). The 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios of the Pb-contaminated sediments of Lianjiang (1.1787 ± 0.0057 and 2.4531 ± 0.0095, respectively) were lower than those of Nanyang River (1.1996 ± 0.0059 and 2.4855 ± 0.0082, respectively), indicating a significant input of non-indigenous Pb with low 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios. Copper, Pb and Zn in the non-residual fractions noticeably increased in the contaminated sediments compared to those in the uncontaminated sediments. A genuine concern is associated with potential transport of the contaminated sediments downstream and enhanced solubility and mobility of trace metals in the non-residual fractions.

Coby S C Wong - One of the best experts on this subject based on the ideXlab platform.

  • evidence of excessive releases of metals from primitive e Waste Processing in guiyu china
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Nurdan S Duzgorenaydin, A Aydin, Ming Hung Wong
    Abstract:

    Abstract Guiyu, China is infamous for its involvement in primitive e-Waste Processing and recycling activities. Freshwater samples were collected in and outside of Guiyu for dissolved metal analysis. It was found that dissolved metal concentrations were higher in Lianjiang and Nanyang River within Guiyu than the reservoir outside of Guiyu. Lianjiang was enriched with dissolved As, Cr, Li, Mo, Sb and Se, while Nanyang River had elevated dissolved Ag, Be, Cd, Co, Cu, Ni, Pb and Zn. Temporal distributions of the metals suggested recent discharges of metals attributable to a strong acid leaching operation of e-Waste, where dissolved Ag, Cd, Cu and Ni (0.344 ± 0.014, 0.547 ± 0.074, 87.6 ± 3.0 and 93.0 ± 1.4 μg/L, respectively) were significantly elevated. Pb isotopic composition of dissolved Pb confirmed that more than one non-indigenous Pb were present in Lianjiang and Nanyang River. In summary, it was evident that the riverine environment of Guiyu was heavily impacted by e-Waste related activities.

  • Evidence of excessive releases of metals from primitive e-Waste Processing in Guiyu, China
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Adnan Aydin, Nurdan S. Duzgoren-aydin, Ming Hung Wong
    Abstract:

    Guiyu, China is infamous for its involvement in primitive e-Waste Processing and recycling activities. Freshwater samples were collected in and outside of Guiyu for dissolved metal analysis. It was found that dissolved metal concentrations were higher in Lianjiang and Nanyang River within Guiyu than the reservoir outside of Guiyu. Lianjiang was enriched with dissolved As, Cr, Li, Mo, Sb and Se, while Nanyang River had elevated dissolved Ag, Be, Cd, Co, Cu, Ni, Pb and Zn. Temporal distributions of the metals suggested recent discharges of metals attributable to a strong acid leaching operation of e-Waste, where dissolved Ag, Cd, Cu and Ni (0.344 ± 0.014, 0.547 ± 0.074, 87.6 ± 3.0 and 93.0 ± 1.4 μg/L, respectively) were significantly elevated. Pb isotopic composition of dissolved Pb confirmed that more than one non-indigenous Pb were present in Lianjiang and Nanyang River. In summary, it was evident that the riverine environment of Guiyu was heavily impacted by e-Waste related activities. © 2006 Elsevier Ltd. All rights reserved.

  • trace metal contamination of sediments in an e Waste Processing village in china
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Shengchun Wu, Nurdan S Duzgorenaydin, A Aydin, Ming Hung Wong
    Abstract:

    Abstract This study examined trace metal contamination of sediments in Guiyu, China where primitive e-Waste Processing activities have been carried out. It was found that some river sediments in Guiyu were contaminated with Cd (n.d.–10.3 mg/kg), Cu (17.0–4540 mg/kg), Ni (12.4–543 mg/kg), Pb (28.6–590 mg/kg), and Zn (51.3–324 mg/kg). The 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios of the Pb-contaminated sediments of Lianjiang (1.1787 ± 0.0057 and 2.4531 ± 0.0095, respectively) were lower than those of Nanyang River (1.1996 ± 0.0059 and 2.4855 ± 0.0082, respectively), indicating a significant input of non-indigenous Pb with low 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios. Copper, Pb and Zn in the non-residual fractions noticeably increased in the contaminated sediments compared to those in the uncontaminated sediments. A genuine concern is associated with potential transport of the contaminated sediments downstream and enhanced solubility and mobility of trace metals in the non-residual fractions.

Chunling Luo - One of the best experts on this subject based on the ideXlab platform.

  • heavy metal contamination in soils and vegetables near an e Waste Processing site south china
    Journal of Hazardous Materials, 2011
    Co-Authors: Chunling Luo, Chuanping Liu, Yan Wang, Xiang Liu, Fangbai Li, Gan Zhang, Xiangdong Li
    Abstract:

    Environmental pollution due to uncontrolled e-Waste recycling activities has been reported in a number of locations of China. In the present study, metal pollution to the surrounding environment from a primitive e-Waste Processing facility was investigated. Soils at sites where e-Waste is burned in the open air, those of surrounding paddy fields and vegetable gardens, as well as common vegetable samples were collected and analyzed for heavy metals. The results showed that the soils of former incineration sites had the highest concentrations of Cd, Cu, Pb, and Zn with mean values of 17.1, 11,140, 4500, and 3690 mg kg−1, respectively. The soils of nearby paddy fields and vegetable gardens also had relatively high concentrations of Cd and Cu. In the edible tissues of vegetables, the concentrations of Cd and Pb in most samples exceeded the maximum level permitted for food in China. Sequential leaching tests revealed that the Cu, Pb, and Zn were predominantly associated with the residual fraction, followed by the carbonate/specifically adsorbed phases with the exception of Cd, which was mainly in the extractable form in paddy fields and vegetable soils. The data showed that uncontrolled e-Waste Processing operations caused serious pollution to local soils and vegetables. The cleaning up of former incineration sites should be a priority in any future remediation program.

Xiangdong Li - One of the best experts on this subject based on the ideXlab platform.

  • heavy metal contamination in soils and vegetables near an e Waste Processing site south china
    Journal of Hazardous Materials, 2011
    Co-Authors: Chunling Luo, Chuanping Liu, Yan Wang, Xiang Liu, Fangbai Li, Gan Zhang, Xiangdong Li
    Abstract:

    Environmental pollution due to uncontrolled e-Waste recycling activities has been reported in a number of locations of China. In the present study, metal pollution to the surrounding environment from a primitive e-Waste Processing facility was investigated. Soils at sites where e-Waste is burned in the open air, those of surrounding paddy fields and vegetable gardens, as well as common vegetable samples were collected and analyzed for heavy metals. The results showed that the soils of former incineration sites had the highest concentrations of Cd, Cu, Pb, and Zn with mean values of 17.1, 11,140, 4500, and 3690 mg kg−1, respectively. The soils of nearby paddy fields and vegetable gardens also had relatively high concentrations of Cd and Cu. In the edible tissues of vegetables, the concentrations of Cd and Pb in most samples exceeded the maximum level permitted for food in China. Sequential leaching tests revealed that the Cu, Pb, and Zn were predominantly associated with the residual fraction, followed by the carbonate/specifically adsorbed phases with the exception of Cd, which was mainly in the extractable form in paddy fields and vegetable soils. The data showed that uncontrolled e-Waste Processing operations caused serious pollution to local soils and vegetables. The cleaning up of former incineration sites should be a priority in any future remediation program.

Nurdan S Duzgorenaydin - One of the best experts on this subject based on the ideXlab platform.

  • evidence of excessive releases of metals from primitive e Waste Processing in guiyu china
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Nurdan S Duzgorenaydin, A Aydin, Ming Hung Wong
    Abstract:

    Abstract Guiyu, China is infamous for its involvement in primitive e-Waste Processing and recycling activities. Freshwater samples were collected in and outside of Guiyu for dissolved metal analysis. It was found that dissolved metal concentrations were higher in Lianjiang and Nanyang River within Guiyu than the reservoir outside of Guiyu. Lianjiang was enriched with dissolved As, Cr, Li, Mo, Sb and Se, while Nanyang River had elevated dissolved Ag, Be, Cd, Co, Cu, Ni, Pb and Zn. Temporal distributions of the metals suggested recent discharges of metals attributable to a strong acid leaching operation of e-Waste, where dissolved Ag, Cd, Cu and Ni (0.344 ± 0.014, 0.547 ± 0.074, 87.6 ± 3.0 and 93.0 ± 1.4 μg/L, respectively) were significantly elevated. Pb isotopic composition of dissolved Pb confirmed that more than one non-indigenous Pb were present in Lianjiang and Nanyang River. In summary, it was evident that the riverine environment of Guiyu was heavily impacted by e-Waste related activities.

  • trace metal contamination of sediments in an e Waste Processing village in china
    Environmental Pollution, 2007
    Co-Authors: Coby S C Wong, Shengchun Wu, Nurdan S Duzgorenaydin, A Aydin, Ming Hung Wong
    Abstract:

    Abstract This study examined trace metal contamination of sediments in Guiyu, China where primitive e-Waste Processing activities have been carried out. It was found that some river sediments in Guiyu were contaminated with Cd (n.d.–10.3 mg/kg), Cu (17.0–4540 mg/kg), Ni (12.4–543 mg/kg), Pb (28.6–590 mg/kg), and Zn (51.3–324 mg/kg). The 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios of the Pb-contaminated sediments of Lianjiang (1.1787 ± 0.0057 and 2.4531 ± 0.0095, respectively) were lower than those of Nanyang River (1.1996 ± 0.0059 and 2.4855 ± 0.0082, respectively), indicating a significant input of non-indigenous Pb with low 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios. Copper, Pb and Zn in the non-residual fractions noticeably increased in the contaminated sediments compared to those in the uncontaminated sediments. A genuine concern is associated with potential transport of the contaminated sediments downstream and enhanced solubility and mobility of trace metals in the non-residual fractions.