PubMed | Scientific Research Academy of Guangxi Environmental Protection, Centers for Disease Control and Prevention, Guangxi Medical University and South China Institute of Environmental Sciences
Type: | Journal: The Science of the total environment | Year: 2015
Levels of methyl tertiary-butyl ether (MTBE) in occupational air, ambient air, and drinking water in Nanning, South China, were investigated, and then their potential health risks to occupational workers and the general public were evaluated. Results show that the MTBE concentration in occupational air from 13 service stations was significantly higher than that in ambient air from residential areas (p<0.0001); both are far lower than the threshold limit value-time weighted average of MTBE regulated in the United States (US). The drinking water samples from household taps yielded detectable MTBE in the range of 0.04-0.33 g/L, which is below the US drinking water standard of 20-40 g/L. The non-carcinogenic risk of MTBE from air inhalation may be negligible because the calculated hazard quotient was less than 1. The mean MTBE lifetime cancer risk was within the acceptable limit of 1 10(-6) to 1 10(-4), but the lifetime cancer risk of refueling workers in the urban service station at the 95th percentile slightly exceeded the maximum acceptable carcinogen risk (1 10(-4)), indicating the potential carcinogenic health effects on the population highly exposed to MTBE in this region. The hazard index and carcinogenic risk of MTBE in drinking water were significantly lower than the safe limit of US Environmental Protection Agency, suggesting that drinking water unlikely poses significant health risks to the residents in Nanning.
PubMed | Scientific Research Academy of Guangxi Environmental Protection, University of South China and South China Institute of Environmental Sciences
Type: Journal Article | Journal: Environmental geochemistry and health | Year: 2016
Sulfonamides (SAs) are applied widely as feed additives in the farming of livestock and poultry. It can lead to the excretion of large amounts of SAs in manure and result in persistent environmental pollution. We evaluated the fate of four SAs, sulfamerazine (SM1), sulfachloropyridazine (SCP), sulfadimoxine (SDM) and sulfaquinoxaline (SQ), from oral administration to excretion in urine and feces in pigs. The four SAs were added to homemade feed to make them reach the required concentration gradient, which were 0, 50 and 100mg/kg (low, normal and high concentrations, respectively). In different treatments, excretions of the four SAs were 35.68-86.88%. With regard to total excretion, the order was SQ>SCP>SM1>SDM for all treatments. The concentration of SAs in the feed had significant effects on the amount of the four SAs excreted every day. The concentration of SAs in feces and in the urine for different treatments was 15.03-26.55 and 14.54-69.22%, respectively. In each treatment, excretions of SCP, SDM and SQ in feces were lower than that in urine. The four SAs remained longer in urine than in feces. Excretions in urine and feces were lower if SAs were administered orally rather than by injection.
Gao H.,Scientific Research Academy of Guangxi Environmental Protection |
Yang Y.,Chinese Research Academy of Environmental Sciences |
Huang Q.,Chinese Research Academy of Environmental Sciences |
Wang Q.,Chinese Research Academy of Environmental Sciences
Journal of Material Cycles and Waste Management | Year: 2015
Disposal of waste CRT glass is now an urgent environmental protection issue. We collected waste CRT glass from monochrome and color television sets, analyzed their chemical compositions using X-ray fluorescence, and studied the leaching characteristics of Pb in the glass using sulfuric and nitric acids and acetic acid buffer leaching toxicity tests. The results showed that the order of the Pb leaching levels was color panel glass < monochrome glass < color funnel glass. The average Pb concentrations leached in sulfuric and nitric acids from color funnel and panel glasses and from monochrome funnel and panel glasses did not exceed the regulatory limits for Pb according to the China Identification Standards for Hazardous Waste—Identification for Extraction Toxicity. Only the average concentration of Pb leached in acetic acid buffer from color funnel glass exceeded the regulatory levels for Pb while those from other glasses were lower than 1 mg/L. Monochrome panel and funnel glasses and color panel glass can be disposed off as common industrial solid waste or co-disposed off with municipal solid waste. Color funnel glass, however, should be managed and disposed off in strict conformity with the requirements for hazardous waste disposal. © 2015 Springer Japan
PubMed | Scientific Research Academy of Guangxi Environmental Protection, Guangxi Medical University and South China Institute of Environmental Sciences
Type: Journal Article | Journal: International journal of environmental research and public health | Year: 2016
Atmospheric benzene, toluene, ethylbenzene, and xylenes (BTEX) can lead to multiple health injuries. However, what remains uncertain is the effect of long-term exposure to low levels of BTEX. Thus, we determined the BTEX levels in the air from the refueling and office areas in gas stations. Then we collected workers (200 refueling vs. 52 office workers) peripheral blood samples to analyze the serum total-superoxide dismutase (T-SOD), glutathione (GSH), malondialdehyde (MDA), and 8-hydroxydeoxyguanosine (8-OHdG) levels. DNA damage was analyzed by the comet assay and micronucleus test in buccal epithelial cells. We found that the levels of BTEX in refueling areas were significantly higher than those in office areas (
PubMed | Scientific Research Academy of Guangxi Environmental Protection and Guangxi Medical University
Type: | Journal: The Science of the total environment | Year: 2015
This study evaluates the effect of water source change on heavy metal concentrations in water, paddy soil, and rice, as well as the health risks to residents of three riverine communities in South China. The results show that after substituting the sources of drinking water, heavy metal levels (except for Pb at Tangjun) in drinking water were below WHO guideline values and the potential risk from drinking water may be negligible. The As (46.2-66.8%), Pb (65.7-82.6%), Cd (50.8-55.0%), and Hg (28.3-32.6%) concentrations in paddy soils in Sanhe and Lasha significantly (p<0.05) decreased with a change of irrigation water sources compared to Tangjun, without change of irrigation water source. Similarly, the Cd (39.1-81.3%) and Hg (60.0-75.0%) concentrations in rice grown at Sanhe and Lasha significantly (p<0.05) decreased compared to those at Tangjun. Consequently, replacing irrigation water source significantly (p<0.05) reduced the hazard quotient (HQ) and cancer risk for the corresponding single metal via soil ingestion and rice consumption. Despite that total non-carcinogenic and carcinogenic risks at Sanhe and Lasha were significantly decreased, they still exceeded the maximum acceptable limits recommended by US EPA, indicating that residents of these two communities remain at high risks of both non-cancer and cancer effects.
Mo Y.-Y.,Guangxi University |
Tang Y.-K.,Guangxi University |
Wang S.-Y.,Guangxi University |
Lin J.-M.,Guangxi University |
And 2 more authors.
Materials Letters | Year: 2015
Silver nanoparticles(Ag-NPs) are synthetized successfully by using leaf extract of eucalyptus. The Ag-NPs obtained are characterized by ultraviolet-visible (UV-vis) spectrometer, field emission transmission electron microscopy (FE-TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). FE-TEM analysis revealed the shape of those Ag-NPs being spherical morphologies, with the size range of 4-60 nm. FTIR spectrum assumed the polyphenols and proteins act as reducing and stabilizing agents in the synthesis of Ag-NPs. © 2015 Elsevier B.V.
Zhang D.,Guangxi University |
Wang Y.,Guangxi University |
Yu K.,Guangxi University |
Li P.,Guangxi University |
And 2 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2014
The Lijiang River is a typical karst river of southwestern China. Karst-aquifer systems are more vulnerable to contamination compared to other types of aquifers. The occurrence and distribution of organochlorine pesticides (OCPs) in surface sediments from the Lijiang River were investigated to evaluate their potential ecological risks. The total concentrations of them in sediments ranged from 0.80 to 18.73 ng/g dry weight (dw) (mean 6.83 ng/g dw). The residue levels of OCPs varied in the order of HCB > HCHs > DDTs. Compositional analyses of OCPs showed that HCHs and DDTs were mainly from historical usage. The ecological risk assessment suggested that HCHs and DDTs in Lijiang River sediments may cause adverse ecological risks, particularly at sites near agricultural areas. © 2014 Springer Science+Business Media New York.
PubMed | Scientific Research Academy of Guangxi Environmental Protection and CAS Research Center for Eco Environmental Sciences
Type: | Journal: Journal of environmental sciences (China) | Year: 2016
Both internal carbon source and some external carbon sources were used to improve the nutrient removal in Anaerobic-Anoxic-Oxic-Membrane Bioreactor (A
Zhao L.-X.,Scientific Research Academy of GuangXi Environmental Protection |
Zhang L.-H.,Scientific Research Academy of GuangXi Environmental Protection |
Song X.-W.,Scientific Research Academy of GuangXi Environmental Protection |
Qin N.-J.,Scientific Research Academy of GuangXi Environmental Protection |
Zhang J.,Scientific Research Academy of GuangXi Environmental Protection
Environmental Science and Engineering (Subseries: Environmental Science) | Year: 2015
Guangxi’s economic development mainly relies on major industries such as electric power, steel, cement, nonferrous metallurgy, papermaking, sugar, starch, and glass industry. With continuous development of the economy, the situation of carbon emission reduction of these industries is not optimistic. In this paper, carbon emission of Guangxi’s major industries in 2012 was calculated using Oak Ridge National Laboratory (ORNL) and Intergovernmental Panel on Climate Change (IPCC) method, and then, the situation of carbon emissions was analyzed. The results showed that carbon emission of Guangxi’s major industries mainly came from energy consumption, but carbon emissions in the technological process also should not be ignored; carbon emissions were mainly from industries such as steel, cement, thermal power, and nonferrous metallurgical and chemical industry where energy consumption is high and energy efficiency is low. The key factors that influence carbon emissions of these industries included irrational energy consumption structure and energy processing, the overall low utilization efficiency, and the increasing demand with the rapid economic growth. In order to realize a lowcarbon economy and sustainable development in these major industries, the following measures were proposed such as formulation of low-carbon development planning and regulatory standards in these industries, management strengthening of the energy consumption in existing enterprises, optimization of the industrial and energy structure, and actively carrying out industrial upgrade, vigorous promotion of the use of new energy, establishment of thefinancing and policy guaranteeing system, and improvement of the processing and utilization of energy resources. © 2015 Springer-Verlag Berlin Heidelberg.