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161.
Lawrence Fishbein 《毒物与环境化学》2013,95(1-4):1-7
There is a growing recognition that individual exposures to a broad spectrum of metal, inorganic and organic pollutants exceed those from ambient and in some cases from the vicinity of industry environments. The agents often found in indoor environments are mostly known to be hazardous in high concentrations, but the lower limit of their dose response relationships are poorly defined. The major sources of metals in indoor environments are cigarette smoke (mainstream and side stream), fuel combustion, house dust and consumer products with arsenic, cadmium, lead and nickel being of primary toxicological potential (i.e. carcinogenic, genotoxic and reproductive development). Aspects of levels and duration of human exposure to these elements in relation to existing body burdens and subsequent bioavailability and interactions are generally poorly known from inhalation sources. Although the magnitude of indoor health hazards to metallic constituents is not now known, mounting evidence suggests that both identification of agents and the measurement of indoor exposures are critical for a more realistic assessment of the effect of this aspect of air pollution on human health. 相似文献
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Neal Colin Reynolds Brian Neal Margaret Wickham Heather Hill Linda Pugh Bronwen 《Water, Air, & Soil Pollution: Focus》2003,3(1):119-138
A 12-year record of water quality data for runoff from a spruce forested hillslope with podzolic soils shows the impacts of conifer harvesting and replanting in relation to nitrate generation and its influence on surface water acidification. With felling, nitrate increases from a background of 18 Eq/l to about 50 Eq/l after 1 to 2 years and then declines to background levels over the next 1 to 2 years and to lower concentrations thereafter. This change is mirrored by an acidification process as manifest by a change in Gran alkalinity, acid neutralization capacity (ANC) and aluminium concentrations as well as pH. For example, Gran alkalinity and ANC, which start at negative concentrations prior to felling (about –20 and –50 Eq/l, respectively), become more negative (–30 and –100 Eq/l, respectively) at high nitrate concentrations. Correspondingly, pH decreases from about 4.7 to 4.5 and aluminium concentrations increase from about 14 to 16 M. Subsequently, the acidification is reversed as nitrate concentrations decline and after five years post-felling the system has higher pH, Gran alkalinity and ANC together with lower aluminium concentrations than even before the felling took place (the post-felling values are about 4.9, -15 Eq/l, –20 Eq/l and 7 M/l, respectively).Other determinands show clear changes over time. For example, there is a marked increase in sodium and chloride prior to and around the time of felling (200 to 300 and 230 to 400 Eq/l, respectively), with a subsequent decline in concentration to pre-felling and to lower values of around 160 and 170 Eq/l, respectively, thereafter. This change is probably associated with abnormally high inputs of sea-salts from the atmosphere during the first quarter of the year of felling, and dilution thereafter, rather than a direct consequence of the felling activity itself: this change in sea salt loading has had an impact on stream acidity. Dissolved organic carbon and iron also change with concentrations increasing over time (60 to 200 and 1.0 to 1.5 M/l, respectively) and this mirrors a general pattern observed across the Plynlimon catchments irrespective of whether or not there has been felling activity.The implications of the findings are discussed in relations to environmental management and hydrochemical processes. 相似文献
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随着我国用铝量的逐年增加,再生铝高值利用越来越受到行业关注。介绍了废铝回收处理工艺及设备,以及废铝回收处理过程中的技术难点。指出废铝回收再利用,对节约资源、保护环境具有重要意义。 相似文献
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C B Chidambara Raj Tan Ee Kwong Wong Wai Cheng Lee Mun Fong Soh Hoo Tiong Paul Stefan Klose 《环境科学学报(英文版)》2008,20(11):1300-1305
Reclamation of clean water from filter backwash water was studied through pilot-scale experiments.The pilot plant consisted of clarification,sand-filtration,and ultrafiltration modules in sequence,with a provision to bypass the sand filter.Clean water that conformed to World Health Organization (WHO) guidelines on Potable Quality was reclaimed.Turbidity,aluminum and iron were found to be critical contaminants in process selection and design.Clarification,followed by sand filtration,was found to be the minim... 相似文献
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以聚丙烯酰胺、甲醛、亚硫酸氢钠、二硫化碳、氢氧化钠为原料,制备出新型重金属絮凝剂二硫代羧基化磺甲基聚丙烯酰胺(DTSPAM),考察了3种常见有机配位剂EDTA、焦磷酸钠、柠檬酸钠对DTSPAM除Cd2+性能的影响.实验结果表明,在单一含Cd2+水样中,pH值为3.0~6.0时DTSPAM对Cd2+均有较好的去除性能;在不同EDTA浓度、不同pH值下的混合水样中,EDTA对DTSPAM除Cd2+均呈抑制作用;水样pH值为5.0、6.0时,焦磷酸钠、柠檬酸钠对DTSPAM除Cd2+均表现出促进作用,而pH值为2.0~4.0时,焦磷酸钠、柠檬酸钠对DTSPAM除Cd2+均呈抑制作用. 相似文献