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邓楠 《中国人口.资源与环境》1992,(2)
发展中国家正处于工业化起始和发展阶段,煤炭的开发和利用逐年增多,这将造成对环境的污染。因此,包括中国在内的发展中国家,面临着能源结构和能源利用方式一次新的战略变革,这种变革使资源消费型发展模式,转向资源节约模式。中国本着负责的态度,在发展经济的同时始终把环境保护作为一项基本国策。但限于发展中国家财力和技术条件有限,我们希望国际社会建立保障环境安全和发展的国际资金机制,包括以优惠或非商业性条件转让环境保护有益的技术和提供足够的、新的和额外的资金以推动新技术的应用。 相似文献
264.
采用重组酵母测评系统对香烟烟雾溶液和汽车尾气提取物分别进行雌激素活性的测定.结果显示在受试浓度下,PBS烟雾溶液和DMSO烟雾溶液的β-半乳糖苷酶活性与溶剂对照相比均无显著性差异(P>0·05).汽油燃料车尾气在600mL·mL-1时,其酵母菌液OD600明显低于DMSO对照组(P<0·05);在150mL·mL-1剂量时,汽油燃料车尾气所检出的β-半乳糖苷酶活性为44·56,与DMSO对照组相比有显著性差异(P<0·05),当剂量增加至300mL·mL-1,酶活性升高为66·43,约为对照组的12倍,其它各剂量组酶活性与DMSO对照组相比无显著性差异(P>0·05);甲醇燃料车尾气的β-半乳糖苷酶活性与溶剂对照相比无显著性差异(P>0·05).提示汽油燃料车尾气具有弱雌激素活性,甲醇燃料车尾气和香烟烟雾溶液未检出雌激素活性. 相似文献
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Mixtures of different amines including tertiary amines (methyldiethanolamine, MDEA) are commonly used for the removal of CO2 from gas mixtures or in gas sweetening processes for the extraction of CO2 and H2S. The absorber solutions used can be released into the industrial waste water due to continuous substitution of degraded MDEA, periodically cleaning processes or an accidental spill. In this study, the aerobic biodegradability of MDEA was investigated in a standardised batch test and a continuous flow experiment (40 l/d). The results of the batch test indicated that the MDEA-solution was non-biodegradable during the test period of 28 days, whereas the continuous flow experiments showed biodegradation of more than 96% based on TOC-measurements. This was probably due to the adaptation of the microorganisms to this particular waste water contamination during continuous flow experiment. 相似文献
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介绍了扬州市污染源监控系统的组成、系统建设过程中出现的难点和解决方法,以及系统今后的改进。 相似文献
269.
+ 《Journal of contaminant hydrology》2003,61(1-4):33
A lack of information in databases for contamination risk assessment about the transport behaviour of the trivalent f-orbital elements in groundwater systems where calcite is at equilibrium motivated this study of Eu3+ uptake. The free drift technique was used to examine the effects of Eu3+ concentration, presence of Na+ or K+ and temperature, as well as calcite nucleation and precipitation kinetics, on the partitioning of calcite. Changes in surface composition and morphology resulting from exposure of single crystals of Iceland spar to Eu3+-bearing solutions were observed with X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). First results confirm that calcite has high affinity for Eu3+. Rates of nucleation and precipitation strongly affect the extent of uptake but the presence of Na+ and K+ has no effect, suggesting formation of solid solution as CaCO3–EuOHCO3. Surface-sensitive techniques prove that Eu3+ is adsorbed to calcite even when the surface is dissolving and adsorption is not accompanied by precipitation of a separate Eu3+-solid phase. Adsorbed Eu modifies calcite's dissolution behaviour, roughening terraces and rounding step edges, and producing surface morphology where some surface sites appear blocked. Results imply that Eu3+ concentrations in natural calcites are limited by Eu3+ availability rather than by a lack of ability to fit into calcite's atomic structure. This behaviour can probably be expected for other trivalent rare Earth elements (REE), actinides and fission products whose behaviour is similar to that of Eu3+. These elements are likely to be incorporated within the calcite bulk in systems where it is precipitating and the demonstrated strong partitioning ensures some uptake even where calcite is at or under saturation. 相似文献
270.