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861.
Levels of PCDD/FS in ambient air and soil in the vicinity of a municipal solid waste incinerator in Hsinchu 总被引:10,自引:0,他引:10
Levels of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were determined in twenty-one ambient air samples, eight soil samples and two stack gas samples, collected near or in a municipal solid waste incinerator (MSWI) in Hsinchu, Taiwan. A systematic decrease of PCDD/Fs in the ambient air from the northeastern area was observed. PCDD/Fs levels measured in the ambient air range from 0.058 to 0.127 pg-TEQ/m3. Higher PCDD/Fs levels in the ambient air were found during winter. In addition, PCDD/Fs levels measured in the soil range from 0.524 to 5.02 pg-TEQ/g d.m. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) did not provide sufficient evidence that the environmental PCDD/Fs contamination was caused by emissions from the Hsinchu MSWI. An unknown PCDD/Fs source was proposed using congener profile analysis and supported by both PCA and HCA. 相似文献
862.
Estimation of metal and organochlorine pesticide exposures and potential health threat by consumption of oysters in Taiwan 总被引:1,自引:0,他引:1
Han BC Jeng WL Hung TC Ling YC Shieh MJ Chien LC 《Environmental pollution (Barking, Essex : 1987)》2000,109(1):147-156
Pollutant concentrations detected in oysters from 12 different culture areas of Taiwan (especially for the Hsiangshan area and the Machu Islands) from 1991-98 were evaluated to investigate potential carcinogenic (inorganic As and organochlorine pesticides) and non-carcinogenic (Cu, Zn, Cd and inorganic As) risk to the public from ingestion of the oysters. The highest geometric mean (GM) Cu and Zn concentrations of 1108 (range 113-2806) and 1567 (range 303-3593) microg/g dry weight were obtained in oysters from the Hsiangshan coastal area. The maximum GM Cd and As concentrations of 6.82 and 19.3 microg/g dry weight were found in oysters from the Machu Islands area. The p,p'-DDE values range from not detectable in Penghu Islands' oysters to 164 ng/g dry weight in Machu Islands' oysters. The highest tDDT (sum of p,p'-DDE, p,p'-DDD and p,p'-DDT) concentrations of 337 and 340 ng/g dry weight were found in oysters from Kimmen and Machu Islands, respectively. A calculated target hazard quotient (THQ; daily intake/reference dose) of 11.4 (based on 139 g oysters/day) for Cu caused by consuming oysters from the Hsiangshan area is higher than that from other areas (range 0.124-5.95). The highest average Cu intake from Hsiangshan's oysters for individuals is 11.4 times (i.e. THQ=11.4) more than that of reference dose (40 microg/kg/day). However, the maximum THQ values for Cd and As caused by consuming oysters collected from the Machu Islands were 5.57 and 2.63 for Cd and As, respectively. Generally, the results of THQ showed that if only the maximally exposed individuals were considered, the value of 65.4% for oyster was higher than 1.0 in comparison with reference dose. All cancer risk estimates for inorganic As from consuming oysters were higher than 10(-6) (range from 128x10(-6) to 509x10(-6) for maximally exposed individuals and range from 17.1x10(-6) to 68.0x10(-6) for typically exposed individuals, respectively); that is the risk of the lower end of the range of acceptable risk. The highest risk estimate for inorganic As was 509x10(-6) for consumption of oysters by Machu Islands' residents. The lifetime cancer risks of 19.0x10(-6) for tDDT by consuming oysters from the Machu Islands was higher than those from the Penghu Islands (0.37x10(-6)). Therefore, the sum of lifetime cancer risks for tDDT and inorganic As had the highest risks (total risk=528x10(-6)) of consuming oysters from the Machu Islands. Furthermore, a 10(-6) upper limit on lifetime risk as the health protection standard would require maximum oyster consumption rates of approximately 0.26 g/day. 相似文献
863.
排污许可证制度在总量控制中的作用和地位 总被引:2,自引:0,他引:2
为了使污染物总量控制工作逐步走向深入并真正收到实效,对“排污许可证制度”核定单位的污染物排放量、排污行为的有效约束、企业排污权的转移与交易、区域污染物排放状况的调控,以及如何确立该制度在污染物总量控制工作中的地位进行了探讨。 相似文献
864.
865.
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867.
浅述复垦土地经济评价 总被引:1,自引:0,他引:1
本文对复垦土地的经济评价的意义、国内外发展现状进行了较为详细的阐述,并进行了复垦土地经济评价研究内容和方法的探讨,目的是为了完善我国的土地复垦工作中的薄弱环节。 相似文献
868.
Study on the response of wheat to lead, cadmium and zinc 总被引:2,自引:0,他引:2
Meng Ling Tan De-yong Wang Huan-xiao Duan Chang-qong Duan Pei-Shang Gao Shang-Yi 《环境科学学报(英文版)》1998,10(2):238-244
Studyontheresponseofwheattolead,cadmiumandzincMengLing,TanDeyong,WangHuanxiao,DuanChangqun,DuanPeishang,GaoShangyiDepar... 相似文献
869.
870.
采用新型工艺UV/H2O2/微曝气对水中内分泌干扰物(EDCs)4-叔丁基苯酚(BP)的降解进行研究.结果表明,UV/H2O2/微曝气工艺比UV/H2O2工艺可以更为有效地去除水中BP;UV/H2O2/微曝气联用工艺降解BP受BP初始浓度值、UV光强、初始H2O2投加浓度以及溶液初始pH影响较大.随着光强的增大,BP的降解速率呈线性增长;在329~882μg/L浓度范围内,k1随着浓度的增大而逐步降低;随着初始H2O2投加浓度从1mg/L上升到20mg/L,k1几乎呈线性增长;当BP溶液pH值为3.94时,UV/H2O2/微曝气对BP的降解速率最大. 相似文献