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21.
本文运用UDS试验来检测黄浦江水质致遗传毒性,结果表明,试验条件是可行的。UDS试验从DNA修复合成的角度来反映受试物的致遗传毒性作用,可作为水质评价的方法之一。 相似文献
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Nugraha E. Suyatma Alain Copinet Lan Tighzert Veronique Coma 《Journal of Polymers and the Environment》2004,12(1):1-6
Biodegradable film blends of chitosan with poly(lactic acid) (PLA) were prepared by solution mixing and film casting. The main goal of these blends is to improve the water vapor barrier of chitosan by blending it with a hydrophobic biodegradable polymer from renewable resources. Mechanical properties of obtained films were assessed by tensile test. Thermal properties, water barrier properties, and water sensitivity were studied by differential scanning calorimeter analysis, water vapor permeability measurements, and surface-angle contact tests, respectively. The incorporation of PLA to chitosan improved the water barrier properties and decreased the water sensitivity of chitosan film. However, the tensile strength and elastic modulus of chitosan decreased with the addition of PLA. Mechanical and thermal properties revealed that chitosan and PLA blends are incompatible, consistent with the results of Fourier transform infrared (FTIR) analysis that showed the absence of specific interaction between chitosan and PLA. 相似文献
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VanWoert ND Rowe DB Andresen JA Rugh CL Fernandez RT Xiao L 《Journal of environmental quality》2005,34(3):1036-1044
Urban areas generate considerably more stormwater runoff than natural areas of the same size due to a greater percentage of impervious surfaces that impede water infiltration. Roof surfaces account for a large portion of this impervious cover. Establishing vegetation on rooftops, known as green roofs, is one method of recovering lost green space that can aid in mitigating stormwater runoff. Two studies were performed using several roof platforms to quantify the effects of various treatments on stormwater retention. The first study used three different roof surface treatments to quantify differences in stormwater retention of a standard commercial roof with gravel ballast, an extensive green roof system without vegetation, and a typical extensive green roof with vegetation. Overall, mean percent rainfall retention ranged from 48.7% (gravel) to 82.8% (vegetated). The second study tested the influence of roof slope (2 and 6.5%) and green roof media depth (2.5, 4.0, and 6.0 cm) on stormwater retention. For all combined rain events, platforms at 2% slope with a 4-cm media depth had the greatest mean retention, 87%, although the difference from the other treatments was minimal. The combination of reduced slope and deeper media clearly reduced the total quantity of runoff. For both studies, vegetated green roof systems not only reduced the amount of stormwater runoff, they also extended its duration over a period of time beyond the actual rain event. 相似文献
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Chen Yonglin Cui Jian Gong Yaqi Wei Shuang Wei Yuanyun Yi Lan 《Environmental science and pollution research international》2021,28(13):15584-15596
Environmental Science and Pollution Research - Ionizing radiation (IR) is a form of high energy. It poses a serious threat to organisms, but radiotherapy is a key therapeutic strategy for various... 相似文献
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Yu Lan Ying Ruiyao Zhang Bingbing 《Environmental science and pollution research international》2021,28(35):48123-48140
Environmental Science and Pollution Research - This paper analyzes the theoretical mechanism and transmission channel for the impact of air pollution on firms’ domestic value-added ratio... 相似文献
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以锐钛矿型TiO2为载体,采用分步共混法制备了Mn-Ce/TiO2催化剂,通过考察不同活性组分前驱体、焙烧温度以及活性组分负载量对催化剂样品脱硝性能的影响,以确定最佳制备参数;结合XRD(X射线衍射)、XPS(X射线光电子能谱分析)、BET比表积等表征手段研究制备参数对催化剂性能的影响.结果表明:无定型态MnO2含量越多,越有利于提高催化剂的脱硝活性;催化剂样品表面原子浓度比Mn/Ti[或(Mn+Ce)/Ti]越高,催化剂表面有效活性组分越多,催化剂脱硝活性越好.以自制Mn盐(MX)为前驱体,在Mn-Ce活性组分负载量为16%时,经500℃焙烧的催化剂样品脱硝活性最高;反应空速为10000 h-1,反应温度为80℃时,其脱硝效率可达80%,150℃时脱硝效效率可达99%. 相似文献