共查询到20条相似文献,搜索用时 125 毫秒
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介绍了美国大气排污许可证制度的类型及适用范围、申领门槛及流程、内容及执行情况,指出美国通过实施预建许可证与运营许可证制度,实现了对新、改建固定污染源及现有固定污染源的全过程监管。结合我国大气排污许可证制度存在的问题,提出了进一步完善法律支撑、加强计量体系建设、加大许可证执行力度等建议。 相似文献
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贾龙华 《环境监测管理与技术》2000,12(1):7-8
分析了环保行政主管部门监测站在污染源监测工作中的地位与作用,指出环保主管部门监测站的主要任务是对辖区内排污单位的污染物排放监测工作质量进行监督,以促进排污单位认真监测、如实申报,保障辖区内污染源监测工作的规范、有序运行,并负责了解、掌握辖区内的总体污染物排放情况。 相似文献
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贾龙华 《环境监测管理与技术》2000,12(1):7-8,25
分析了环保行政主管部门监测站在污染源监测工作中的地位与作用,指出环保主管部门监测站的主要任务是对辖区内排污单位的污染物排放监测工作质量进行监督,以促进排污单位认真监测、如实申报,保障区内污染源监测工作的规范,有序运行,并负责了解、掌握区内的总体污染物排放情况。 相似文献
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对如何开展排污申报登记工作在完善体制,明确职能,加强培训,提高申报质量,加强申报核查工作等方面作了阐述。 相似文献
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Per Stålnacke Anders Grimvall Karin Sundblad Anders Wilander 《Environmental monitoring and assessment》1999,59(1):47-72
Concern about nitrogen loads in marine environments has drawn attention to the existence and possible causes of long-term trends in nitrogen transport in rivers. The present study was based on data from the Swedish environmental monitoring programme for surface water quality; the continuity of these data is internationally unique. A recently developed semiparametric method was employed to study the development of relationships between runoff and river transport of nitrogen since 1971; the observed relationships were then used to produce time series of flow-normalised transports for 66 sites in 39 river basins. Subsequent statistical analyses of flow-normalised data revealed only few significant downward trends (p 0.05) during the time period 1971–1994, and the most pronounced of these downward trends were caused by reduced point emissions of nitrogen. The number of significant upward trends was substantially larger (15 for total-N and 18 for NO3-N). Closer examination of obtained results revealed the following: (i) the most pronounced upward trends were present downstream of lakes, and (ii) observed increases in nitrogen transport coincided in time and space with reduced point emissions of phosphorus or organic matter. This indicated that changes in the retention of nitrogen in lakes were responsible for the upward nitrogen trends. The hypothesis that nitrogen saturation of forest soils has caused a general increase in the riverine export of nitrogen from forested catchments in Sweden was not confirmed. Neither did the results indicate that improved agricultural practices have reduced the export of nitrogen from agricultural catchments. 相似文献
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建立了以w(C2H5OH)=95 %乙醇直接提取,高效液相色谱仪在波长280 nm和254 nm处连续测定饲料中维生素A、维生素D3和维生素E的方法.色谱柱为大连依利特Hypersil ODS C18(25 cm×4.6 mm×5 μm),流动相为甲醇-水,流速为1.2 mL/min.维生素A、维生素D3、维生素E的质量浓度分别在1.0 mg/L~20.0 mg/L、0.5 mg/L~15.0 mg/L 、2.5 mg/L~50.0 mg/L范围内与峰面积呈良好的线性关系,检测限分别为0.3×10-6 μg、0.04×10-6 μg、5.0×10-6 μg,相对标准偏差分别为1.6 %、2.7 %、2.4 %,平均回收率分别为99 %、102 %、98 %. 相似文献
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Srikanth R Viswanatham KS Kahsai F Fisahatsion A Asmellash M 《Environmental monitoring and assessment》2002,75(2):169-177
A study was undertaken to estimate fluoride content in thegroundwater in certain parts of rural Eritrea, North-East Africa,along the River Anseba. Standard procedure was adopted for fluoride detection. Results indicate elevated concentration offluoride in groundwater. The highest concentration was found tobe 3.73 mg L-1, well above the safety level for consumption.Geological basis for the high concentration of high fluoride hasbeen established; it is presumed to be the pegmatite intrusion hosted by a granitic batholith. Extensive dental fluorosis has been observed in the population exposed to drinking water of highfluoride content. 相似文献
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为调查丽水市空气中Pb污染现状,在机动车相对集中的市区布设5个测点,测点高度1.2m;监测周期为1a,每星期采样1d或2d,每天采集1个样,每次采样6h;监测项目为TSP、Pb;评价标准采用GB3095—1996《环境空气质量标准》。结果表明,丽水市各测点空气中Pb最大的季均值、年均值均未超标;常规测点和交通路口测点之间TSP、Pb质量浓度值均存在显著的差异性。 相似文献
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Samples of breast muscle from 32 species of waterfowl collected from 123 sites across Canada were analyzed for chlorobenzenes (CBz), chlordane-related compounds (CHL), hexachlorocyclohexanes (HCH), DDT, mirex, dieldrin, PCBs and mercury. ΣDDT, ΣCBz and ΣPCB were the compounds most frequently found above trace levels. ΣHCH and ΣMirex were detected the least often. Mercury was detected in all of the mergansers, over 50% of dabbling, bay and sea ducks, and in less than 2% of the geese analysed. The highest levels of contaminants were generally found in birds feeding at higher trophic levels such as sea ducks and mergansers. With the exception of a few samples of mergansers and long-tailed ducks from eastern Canada, which contained ΣPCB concentrations of 1.0–2.4 mg kg−1, ΣPCB levels were less than 1 mg kg−1 wet weight. Only one merganser from eastern Canada had a ΣDDT concentration (2.6 mg kg−1 ww) which was greater than 1 mg kg−1 ww. The highest ΣCHL (0.10 mg kg−1 ww) was also found in mergansers from eastern Canada. Levels of total mercury in breast muscle were either low (< 1 mg kg−1 ww) or below detection limits with the exception of a few samples of mergansers from eastern Canada which contained mercury concentrations of 1.0–1.5 mg kg−1 ww. Health Canada determined that the organochlorine and mercury levels found in samples of breast muscle of ducks and geese analysed in this study did not pose a health hazard to human consumers and therefore these waterfowl were safe to eat. 相似文献
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为了解兰州市大气PM2.5中金属元素的污染水平和分布,于2013年冬季和春季在兰州市区4个在线监测点进行PM2.5样品采集,利用ICP-MS分析金属元素浓度。结果表明,Pb、B元素含量高于200 ng/m3,V、Fe元素含量在100~200 ng/m3,其余元素含量低于100 ng/m3,其中Pb含量最高,平均含量达到373.8 ng/m3.各监测点元素含量在冬季和春季各有不同,整体上是冬季高于春季。金属元素在兰州市区的空间分布与兰州市工业排放和气象因素有关,工业排放为主导因素。 相似文献
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中国1998年度环境质量状况 总被引:8,自引:0,他引:8
朱建平 《环境监测管理与技术》1999,11(5):19-22
对我国1998年度的环境空气质量,酸雨,主要流域水质,近岸域海水水质,地下水水位与水质,城市声环境、射环境质量,典型区域生态环境的状况进行了综述了与分析,指出了我国的环境污染问题主要是城市空气污染,地面水体污染和城市噪声污染。 相似文献
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The air temperature distributions in August (summer) and December (winter) were measured in an approximately 15 × 15-km urban
area in Hyogo Prefecture, Japan, in order to study the spatial distribution of the air temperature and to propose effective
measures against the heat island phenomenon. The air temperature was measured mainly by using thermometer shelters installed
in an elementary school and a junior high school. The characteristic air temperature distribution depended on the season.
The air temperature was higher inland than in the coastal region in August but was higher in the coastal region in December.
The air temperature index indicated that the area where higher air temperatures would most likely appear was 5 to 10 km inland
from the coast in August and around the coast in December. The seasonal air temperature distribution was presumably due to
the strength of solar radiation and anthropogenic exhaust heat. 相似文献