The Experts below are selected from a list of 2862 Experts worldwide ranked by ideXlab platform
Na Zheng - One of the best experts on this subject based on the ideXlab platform.
-
health risk assessment of heavy metals in street dust around a Zinc Smelting plant in china based on bioavailability and bioaccessibility
Ecotoxicology and Environmental Safety, 2020Co-Authors: Na Zheng, Sujing Wang, Qirui An, Pengyang Li, Xiaoqian LiAbstract:Abstract In order to investigate pollution level, chemical speciation and health risk of exposure to heavy metals in street dust from Smelting district, we carried the following studies: (a). the differences in the morphology of street dust in Smelting and non-Smelting districts using a scanning electron microscope; (b). the chemical speciation and bioavailability of heavy metals in Pb (50.00%) > Cu (19.19%) and Cd (20.36%) > Cu (15.67%) > Pb (5.08%), respectively. Hand-to-mouth ingestion poses the greatest non-carcinogenic exposure risk compared with other exposure pathways. When bioavailability is taken into account, children experienced higher non-carcinogenic and carcinogenic risks of dust exposure compared with adults, and the
-
contamination assessment and health risk of arsenic exposure to stairway dust in the Zinc Smelting district northeast china
Environmental Geochemistry and Health, 2019Co-Authors: Na Zheng, Sujuan Xu, Yan Yu, Lin Tang, Xiaofeng JiAbstract:Stairway dust samples were collected from residential communities in Huludao city to investigate population health risk of arsenic (As) exposure through stairway dust. ArcGIS software was used to analyze As spatial distribution in Huludao city. Hazard index was applied to assess health risk due to exposure to As in stairway dust. The results were that As concentrations ranged from 13.26 to 237.58 mg kg−1, and the mean value was 59.64 mg kg−1, which was seven times as high as the background value of Liaoning Province. The pattern of spatial distribution was concentric rings as the center of Huludao Zinc plant, with the extension to the northeast and southwest. The average value of Igeo was 2.176, which fell into moderately polluted level. For non-carcinogenic risk, the hazard indexes were less than 1, indicating that there was almost no health risk for residents exposed to stairway dust. But population risk exposure to dust would increase rapidly with exposure time in stairway. The highest contribution to the overall figure of non-carcinogenic risk and carcinogenic risk appeared to be ingestion of substrate particles followed by inhalation pathway and dermal absorption of As in dust samples. And for carcinogenic risk, the risk values were lower than the threshold range of EPA’s safe limits (1 × 10−6 and 1 × 10−4), suggesting that potential cancer risk of As due to exposure to stairway dust can be acceptable.
-
geochemistry and health risk assessment of arsenic exposure to street dust in the Zinc Smelting district northeast china
Environmental Geochemistry and Health, 2013Co-Authors: Sujuan Xu, Na Zheng, Yang Wang, Shouzhi ChangAbstract:The aim of this study was to investigate arsenic (As) accumulation in street dust and health risk of population. The investigation concentrated on: a. pollution levels of As in street dust; b. spatial distribution of As in street dust; c. physicochemical properties analysis of street dust; and d. assessment of population health risk due to As exposure to street dust. As concentration in street dust ranged from 3.33 to 185.1 mg kg−1, with a mean of 33.10 mg kg−1, which was higher than the background value of Liaoning soil. As contamination level of the area closing to Huludao Zinc Plant (HZP) was highest. Spatial variation showed that the pollution center was close to HZP, formed radial distribution pattern and extended to the northeast and southwest of HZP. The pH and organic matter of street dust were both higher than the background values of soil in Liaoning. There was significantly negative correlation between As concentration and the pH. The mass percentages of particles 180–100, Industrial district > School > Commercial center > Residential area. Around HZP, Hazard Index (HI) for children and cancer risk of As by street dust exposure exceeded the acceptable values. It indicated that there was a potential adverse effect on children health by As exposure to the street dust of Huludao.
-
mercury contamination due to Zinc Smelting and chlor alkali production in ne china
Applied Geochemistry, 2011Co-Authors: Na Zheng, Qichao Wang, Zhongzhu LiangAbstract:Abstract Zinc Smelting and chlor-alkali production are major sources of Hg contamination to the environment, potentially leading to serious impacts on the health of the local population. Huludao, NE China has been heavily contaminated by Hg due to long-term Zn Smelting and chlor-alkali production. The aim of this work was to determine Hg accumulation in the aquatic and terrestrial environment, as well as in the human population of Huludao. The investigation included: (a) Hg accumulation in sediments, Spirogyra algae, crucian carp and shrimp, (b) Hg distribution in soil, vegetables and corn, and (c) assessment of potential health effects of Hg exposure associated with total Hg (T-Hg) concentrations in human hair. Measured T-Hg concentrations in sediments of Wuli River ranged from 0.15 to 15.4 mg kg−1, with the maximum Hg concentration in sediment exceeding the background levels in Liaoning Province by 438 times. The maximum T-Hg levels in Spirogyra, crucian carp and shrimp were 13.6, 0.36, and 0.44 mg kg−1, respectively. Total-Hg concentrations in hair of the human population varied from 0.05 to 3.25 mg kg−1 (average 0.43 mg kg−1). However, the frequency of paraesthesia to most inhabitants in Huludao was estimated to be lower than 5%, with only one person rated at 50%. The results indicated minimal adverse health effects of Hg exposure to the inhabitants of Huludao, despite the serious Hg contamination of the environment.
-
health risk assessment of heavy metal exposure to street dust in the Zinc Smelting district northeast of china
Science of The Total Environment, 2010Co-Authors: Na Zheng, Qichao Wang, Jingshuang Liu, Zhongzhu LiangAbstract:Abstract Heavy metal contamination in the street dust due to metal Smelting in the industrial district of Huludao city was investigated. Spatial distribution of Hg, Pb, Cd, Zn and Cu in the street dust was elucidated. Meanwhile, noncancer effect and cancer effect of children and adults due to exposure to the street dust were estimated. The maximum Hg, Pb, Cd, Zn and Cu contents in the street dust are 5.212, 3903, 726.2, 79,869, and 1532 mg kg − 1 , and respectively 141, 181, 6724, 1257 and 77.4 times as high as the background values in soil. The trends for Hg, Pb, Cd, Zn and Cu are similar with higher concentrations trending Huludao Zinc plant (HZP). The exponential equation fits quite well for the variations of Pb, Cd, Zn and Cu contents with distance from the pollution sources, but not for Hg. The biggest contribution to street dust is atmospheric deposition due to metal Smelting, but traffic density makes slight contribution to heavy metal contamination. According to the calculation on Hazard Index (HI), in the case of noncancer effect, the ingestion of dust particles of children and adults in Huludao city appears to be the route of exposure to street dust that results in a higher risk for heavy metals, followed by dermal contact. The inhalation of resuspended particles through the mouth and nose is almost negligible. The inhalation of Hg vapour as the fourth exposure pathway to street dust is accounting for the main exposure. Children are experiencing the potential health risk due to HI for Pb larger than safe level (1) and Cd close to 1. Besides, cancer risk of Cd due to inhalation exposure is low.
Mark P. Novotnak - One of the best experts on this subject based on the ideXlab platform.
-
lead isotopic and chalcophile element compositions in the environment near a Zinc Smelting secondary Zinc recovery facility palmerton pennsylvania usa
Applied Geochemistry, 2001Co-Authors: Michael E. Ketterer, Joe H. Lowry, Kenneth Humphries, John Simon, Mark P. NovotnakAbstract:Abstract The environment surrounding Palmerton, Pennsylvania is contaminated with Pb arising from primary Zn Smelting and a process involving Zn recovery from electric arc steel furnace dusts. Lead isotope systematics have been used to distinguish primary Zn Smelting Pb (206Pb/204Pb∼18.4–18.5) from electric arc furnace dust lead (206Pb/204Pb∼19.0–19.1). Primary Zn Smelting is the dominant source of Pb in O2 horizon soils from undisturbed near-Palmerton locations, which contain up to 3570 ppm Pb and 782 ppm Cd. Soils from undeveloped near-Palmerton locations also exhibit unusually elevated concentrations of other sphalerite-derived chalcophilic elements (Se, Ag, In, Sb, Te, Au, Hg, Tl and Bi); indium concentrations of up to 17.0 ppm are observed therein. Residential soils and dusts from Palmerton contain Pb which is largely explainable via mixing of Pb from primary Zn Smelting and electric arc furnace dusts. Approximately 80% of the Pb in airborne particulate matter sampled at Palmerton in 1991 is derived from electric arc furnace dusts, and atmospheric enrichment factors for Cu, Sb, Pb, and Bi are observed which confirm this major source contribution. Residential samples from a control location contain Pb which is less radiogenic than is found in Palmerton, and exhibit no unusual elevation in sphalerite elements. Lead source discrimination in the Palmerton environment via Pb isotopic and elemental constituents approaches result in parallel conclusions.
-
Lead isotopic and chalcophile element compositions in the environment near a Zinc Smelting-secondary Zinc recovery facility, Palmerton, Pennsylvania, USA
Applied Geochemistry, 2001Co-Authors: Michael E. Ketterer, Joe H. Lowry, Kenneth Humphries, John Simon, Mark P. NovotnakAbstract:The environment surrounding Palmerton, Pennsylvania is contaminated with Pb arising from primary Zn Smelting and a process involving Zn recovery from electric arc steel furnace dusts. Lead isotope systematics have been used to distinguish primary Zn Smelting Pb (206Pb/204Pb ~ 18.4-18.5) from electric arc furnace dust lead (206Pb/204Pb ~ 19.0-19.1). Primary Zn Smelting is the dominant source of Pb in O2 horizon soils from undisturbed near-Palmerton locations, which contain up to 3570 ppm Pb and 782 ppm Cd. Soils from undeveloped near-Palmerton locations also exhibit unusually elevated concentrations of other sphalerite-derived chalcophilic elements (Se, Ag, In, Sb, Te, Au, Hg, Tl and Bi); indium concentrations of up to 17.0 ppm are observed therein. Residential soils and dusts from Palmerton contain Pb which is largely explainable via mixing of Pb from primary Zn Smelting and electric arc furnace dusts. Approximately 80% of the Pb in airborne particulate matter sampled at Palmerton in 1991 is derived from electric arc furnace dusts, and atmospheric enrichment factors for Cu, Sb, Pb, and Bi are observed which confirm this major source contribution. Residential samples from a control location contain Pb which is less radiogenic than is found in Palmerton, and exhibit no unusual elevation in sphalerite elements. Lead source discrimination in the Palmerton environment via Pb isotopic and elemental constituents approaches result in parallel conclusions. (C) 2000 Published by Elsevier Science Ltd.
Michael E. Ketterer - One of the best experts on this subject based on the ideXlab platform.
-
lead isotopic and chalcophile element compositions in the environment near a Zinc Smelting secondary Zinc recovery facility palmerton pennsylvania usa
Applied Geochemistry, 2001Co-Authors: Michael E. Ketterer, Joe H. Lowry, Kenneth Humphries, John Simon, Mark P. NovotnakAbstract:Abstract The environment surrounding Palmerton, Pennsylvania is contaminated with Pb arising from primary Zn Smelting and a process involving Zn recovery from electric arc steel furnace dusts. Lead isotope systematics have been used to distinguish primary Zn Smelting Pb (206Pb/204Pb∼18.4–18.5) from electric arc furnace dust lead (206Pb/204Pb∼19.0–19.1). Primary Zn Smelting is the dominant source of Pb in O2 horizon soils from undisturbed near-Palmerton locations, which contain up to 3570 ppm Pb and 782 ppm Cd. Soils from undeveloped near-Palmerton locations also exhibit unusually elevated concentrations of other sphalerite-derived chalcophilic elements (Se, Ag, In, Sb, Te, Au, Hg, Tl and Bi); indium concentrations of up to 17.0 ppm are observed therein. Residential soils and dusts from Palmerton contain Pb which is largely explainable via mixing of Pb from primary Zn Smelting and electric arc furnace dusts. Approximately 80% of the Pb in airborne particulate matter sampled at Palmerton in 1991 is derived from electric arc furnace dusts, and atmospheric enrichment factors for Cu, Sb, Pb, and Bi are observed which confirm this major source contribution. Residential samples from a control location contain Pb which is less radiogenic than is found in Palmerton, and exhibit no unusual elevation in sphalerite elements. Lead source discrimination in the Palmerton environment via Pb isotopic and elemental constituents approaches result in parallel conclusions.
-
Lead isotopic and chalcophile element compositions in the environment near a Zinc Smelting-secondary Zinc recovery facility, Palmerton, Pennsylvania, USA
Applied Geochemistry, 2001Co-Authors: Michael E. Ketterer, Joe H. Lowry, Kenneth Humphries, John Simon, Mark P. NovotnakAbstract:The environment surrounding Palmerton, Pennsylvania is contaminated with Pb arising from primary Zn Smelting and a process involving Zn recovery from electric arc steel furnace dusts. Lead isotope systematics have been used to distinguish primary Zn Smelting Pb (206Pb/204Pb ~ 18.4-18.5) from electric arc furnace dust lead (206Pb/204Pb ~ 19.0-19.1). Primary Zn Smelting is the dominant source of Pb in O2 horizon soils from undisturbed near-Palmerton locations, which contain up to 3570 ppm Pb and 782 ppm Cd. Soils from undeveloped near-Palmerton locations also exhibit unusually elevated concentrations of other sphalerite-derived chalcophilic elements (Se, Ag, In, Sb, Te, Au, Hg, Tl and Bi); indium concentrations of up to 17.0 ppm are observed therein. Residential soils and dusts from Palmerton contain Pb which is largely explainable via mixing of Pb from primary Zn Smelting and electric arc furnace dusts. Approximately 80% of the Pb in airborne particulate matter sampled at Palmerton in 1991 is derived from electric arc furnace dusts, and atmospheric enrichment factors for Cu, Sb, Pb, and Bi are observed which confirm this major source contribution. Residential samples from a control location contain Pb which is less radiogenic than is found in Palmerton, and exhibit no unusual elevation in sphalerite elements. Lead source discrimination in the Palmerton environment via Pb isotopic and elemental constituents approaches result in parallel conclusions. (C) 2000 Published by Elsevier Science Ltd.
Zhongzhu Liang - One of the best experts on this subject based on the ideXlab platform.
-
mercury contamination due to Zinc Smelting and chlor alkali production in ne china
Applied Geochemistry, 2011Co-Authors: Na Zheng, Qichao Wang, Zhongzhu LiangAbstract:Abstract Zinc Smelting and chlor-alkali production are major sources of Hg contamination to the environment, potentially leading to serious impacts on the health of the local population. Huludao, NE China has been heavily contaminated by Hg due to long-term Zn Smelting and chlor-alkali production. The aim of this work was to determine Hg accumulation in the aquatic and terrestrial environment, as well as in the human population of Huludao. The investigation included: (a) Hg accumulation in sediments, Spirogyra algae, crucian carp and shrimp, (b) Hg distribution in soil, vegetables and corn, and (c) assessment of potential health effects of Hg exposure associated with total Hg (T-Hg) concentrations in human hair. Measured T-Hg concentrations in sediments of Wuli River ranged from 0.15 to 15.4 mg kg−1, with the maximum Hg concentration in sediment exceeding the background levels in Liaoning Province by 438 times. The maximum T-Hg levels in Spirogyra, crucian carp and shrimp were 13.6, 0.36, and 0.44 mg kg−1, respectively. Total-Hg concentrations in hair of the human population varied from 0.05 to 3.25 mg kg−1 (average 0.43 mg kg−1). However, the frequency of paraesthesia to most inhabitants in Huludao was estimated to be lower than 5%, with only one person rated at 50%. The results indicated minimal adverse health effects of Hg exposure to the inhabitants of Huludao, despite the serious Hg contamination of the environment.
-
health risk assessment of heavy metal exposure to street dust in the Zinc Smelting district northeast of china
Science of The Total Environment, 2010Co-Authors: Na Zheng, Qichao Wang, Jingshuang Liu, Zhongzhu LiangAbstract:Abstract Heavy metal contamination in the street dust due to metal Smelting in the industrial district of Huludao city was investigated. Spatial distribution of Hg, Pb, Cd, Zn and Cu in the street dust was elucidated. Meanwhile, noncancer effect and cancer effect of children and adults due to exposure to the street dust were estimated. The maximum Hg, Pb, Cd, Zn and Cu contents in the street dust are 5.212, 3903, 726.2, 79,869, and 1532 mg kg − 1 , and respectively 141, 181, 6724, 1257 and 77.4 times as high as the background values in soil. The trends for Hg, Pb, Cd, Zn and Cu are similar with higher concentrations trending Huludao Zinc plant (HZP). The exponential equation fits quite well for the variations of Pb, Cd, Zn and Cu contents with distance from the pollution sources, but not for Hg. The biggest contribution to street dust is atmospheric deposition due to metal Smelting, but traffic density makes slight contribution to heavy metal contamination. According to the calculation on Hazard Index (HI), in the case of noncancer effect, the ingestion of dust particles of children and adults in Huludao city appears to be the route of exposure to street dust that results in a higher risk for heavy metals, followed by dermal contact. The inhalation of resuspended particles through the mouth and nose is almost negligible. The inhalation of Hg vapour as the fourth exposure pathway to street dust is accounting for the main exposure. Children are experiencing the potential health risk due to HI for Pb larger than safe level (1) and Cd close to 1. Besides, cancer risk of Cd due to inhalation exposure is low.
Shouzhi Chang - One of the best experts on this subject based on the ideXlab platform.
-
geochemistry and health risk assessment of arsenic exposure to street dust in the Zinc Smelting district northeast china
Environmental Geochemistry and Health, 2013Co-Authors: Sujuan Xu, Na Zheng, Yang Wang, Shouzhi ChangAbstract:The aim of this study was to investigate arsenic (As) accumulation in street dust and health risk of population. The investigation concentrated on: a. pollution levels of As in street dust; b. spatial distribution of As in street dust; c. physicochemical properties analysis of street dust; and d. assessment of population health risk due to As exposure to street dust. As concentration in street dust ranged from 3.33 to 185.1 mg kg−1, with a mean of 33.10 mg kg−1, which was higher than the background value of Liaoning soil. As contamination level of the area closing to Huludao Zinc Plant (HZP) was highest. Spatial variation showed that the pollution center was close to HZP, formed radial distribution pattern and extended to the northeast and southwest of HZP. The pH and organic matter of street dust were both higher than the background values of soil in Liaoning. There was significantly negative correlation between As concentration and the pH. The mass percentages of particles 180–100, Industrial district > School > Commercial center > Residential area. Around HZP, Hazard Index (HI) for children and cancer risk of As by street dust exposure exceeded the acceptable values. It indicated that there was a potential adverse effect on children health by As exposure to the street dust of Huludao.
