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1.
某石化企业粉体料仓爆燃事故原因分析 总被引:1,自引:0,他引:1
本文以某企业HDPE料仓的一次爆燃事故为案例,通过分析事故的成因,提供了调查料仓事故的思路及整改方案的确定方法. 相似文献
2.
解决西部开发中生态环境问题的对策 总被引:8,自引:0,他引:8
中国进行西部开发必须依据国情,实事求是地从生态建设入手,充分认识到西部地区实现山川秀兰就是最大,最好、最有益的发展。因而,在西部开发中应坚持系统,实现可持续发展战略;坚持生态观,开展生态环境建设;坚持法制观,加大环境保护宣传力度;坚持市场观,提高资源的综合利用;坚持科学观,加强环境保护的技术支持;坚持创新观,发挥高等院校的整体优势。 相似文献
3.
Sulfur speciation and bioaccumulation in camphor tree leaves as atmospheric sulfur indicator analyzed by synchrotron radiation XRF and XANES 总被引:2,自引:0,他引:2
Jianrong Zeng Guilin Zhang Liangman Bao Shilei Long Mingguang Tan Yan Li Chenyan M Yidong Zhao 《环境科学学报(英文版)》2013,25(3):605-612
Analyzing and understanding the effects of ambient pollution on plants is getting more and more attention as a topic of environmental biology.A method based on synchrotron radiation X-ray fluorescence and X-ray absorption near edge structure spectroscopy was established to analyze the sulfur concentration and speciation in mature camphor tree leaves (CTLs),which were sampled from 5 local fields in Shanghai,China.Annual SO2 concentration,SO42-concentration in atmospheric particulate,SO42-and sulfur concentration in soil were also analyzed to explore the relationship between ambient sulfur sources and the sulfur nutrient cycling in CTLs.Total sulfur concentration in mature camphor tree leaves was 766-1704 mg/kg.The mainly detected sulfur states and their corresponding compounds were +6 (sulfate,include inorganic sulfate and organic sulfate),+5.2 (sulfonate),+2.2 (suloxides),+0.6 (thiols and thiothers),+0.2 (organic sulfides).Total sulfur concentration was strongly correlated with sulfate proportion with a linear correlation coefficient up to 0.977,which suggested that sulfur accumulated in CTLs as sulfate form.Reduced sulfur compounds (organic sulfides,thiols,thioethers,sulfoxide and sulfonate) assimilation was sufficed to meet the nutrient requirement for growth at a balanced level around 526 mg/kg.The sulfate accumulation mainly caused by atmospheric sulfur pollution such as SO2 and airborne sulfate particulate instead of soil contamination.From urban to suburb place,sulfate in mature CTLs decreased as the atmospheric sulfur pollution reduced,but a dramatic increase presented near the seashore,where the marine sulfate emission and maritime activity pollution were significant.The sulfur concentration and speciation in mature CTLs effectively represented the long-term biological accumulation of atmospheric sulfur pollution in local environment. 相似文献
4.
Ting Guo Zhipeng Bai Can Wu Tan Zhu 《Frontiers of Environmental Science & Engineering in China》2008,2(2):224-229
TiO2 supported on active carbon fiber (TiO2/ACF), an absorbable photocatalyst, is a new kind of material applied in air purification. In this paper, the influence of
environmental temperature (T) and relative humidity (RH) on the gas-solid adsorption of toluene and the photocatalytic oxidation
(PCO) efficiency of adsorbed toluene on TiO2/ACF were studied, and then, the purification capability of TiO2/ACF was estimated. PCO results showed that although the PCO efficiency increased under high RH and T levels, the amount of
adsorption of toluene decreased. Moreover, quantitative analysis results of intermediates indicated that more environmental
risk emerged when PCO of toluene was carried out at higher environmental T and RH levels because more toxic intermediates
would be accumulated on the TiO2/ACF. So, it is significant to control the environmental T and RH conditions in the application of the PCO technique. T =
25°C and RH530% is the optimal condition for purifying toluene in our experimental system.
__________
Translated from Urban Environment & Urban Ecology, 2007, 20(5): 10–13 [译自: 城市环境与城市生态] 相似文献
5.
The characteristics of Pb2+ adsorption on the surface of birnessites with different average oxidation states (AOS) of Mn, synthesized under acidic and alkali conditions, were investigated. The results indicated that the amount of adsorbed Pb2+ increased with the increase of Mn AOS in birnessites. The amount of Pb2+ adsorbed positively correlated with the amount of released Mn2+, H+, and K+ (r = 0.9962 > 0.6614, n = 14, α = 0.01). The released Mn2+, H+, and K+ were derived mostly from the corresponding catio... 相似文献
6.
根据扬子地块西北缘、西南缘卡林型金矿床的地质、地球化学特征 ,可以将它们划分为三种矿床地球化学类型 :Au -As-(Sb)型、Au -Hg -(Tl或U)型和Au -Sb -黄铁矿型金矿床。Au -As-(Sb)型金矿床可以成为超大型金矿床。Au -As-(Sb)型金矿床的含矿建造富含有机质、沉积成因的黄铁矿和Au、As、Sb、Fe、S等。它们属于还原环境形成的黑色沉积岩系。其构造背景是被动大陆边缘的裂谷带和裂陷沉降盆地。Au -As-(Sb)型金矿床含矿建造的干酪根是Ⅱ型干酪根 ,其原始有机母质是还原环境中形成的海相菌藻类生物演化成的腐泥型有机质。大型或超大型金矿的干酪根的元素组成显示 ,含矿流体的脱碳作用和内生氧化作用在成矿过程中具重要意义。 相似文献
7.
Zhong Chao Gong Jinke Wang Shaoli Tan Jiqiu Liu Junan Zhu Yun Jia Guohai 《Environmental science and pollution research international》2021,28(16):20034-20044
Environmental Science and Pollution Research - The high NO2/NOX ratio in the after-treatment system is beneficial to its performance and achieved by NO catalytic conversion in diesel oxidation... 相似文献
8.
This work investigates the effects of lubricant sulfur contents on the morphology, nanostructure, size distribution and elemental composition of diesel exhaust particle on a light-duty diesel engine. Three kinds of lubricant (LS-oil, MS-oil and HS-oil, all of which have different sulfur contents: 0.182%, 0.583% and 1.06%, respectively) were used in this study. The morphologies and nanostructures of exhaust particles were analyzed using high-resolution transmission electron microscopy (TEM). Size distributions of primary particles were determined through advanced image-processing software. Elemental compositions of exhaust particles were obtained through X-ray energy dispersive spectroscopy (EDS). Results show that as lubricant sulfur contents increase, the macroscopic structure of diesel exhaust particles turn from chain-like to a more complex agglomerate. The inner cores of the core-shell structure belonging to these primary particles change little; the shell thickness decreases, and the spacing of carbon layer gradually descends, and amorphous materials that attached onto outer carbon layer of primary particles increase. Size distributions of primary particles present a unimodal and normal distribution, and higher sulfur contents lead to larger size primary particles. The sulfur content in lubricants directly affects the chemical composition in the particles. The content of C (carbon) decreases as sulfur increases in the lubricants, while the contents of O (oxygen), S (sulfur) and trace elements (including S, Si (silicon), Fe (ferrum), P (phosphorus), Ca (calcium), Zn (zinc), Mg (magnesium), Cl (chlorine) and Ni (nickel)) all increase in particles. 相似文献
9.
目前恶臭污染源排气及环境空气样品臭气浓度的测定一般采用三点比较式臭袋法。该方法侧重于臭气样品的实验室分析,对样品的现场采集部分未作具体要求。本文针对臭气浓度无组织排放现场监测中的常见问题,尤其是现有标准和规范中未明确的内容,从排放源的确认、生产工况的监督、气象条件的选择、监控点位的设置、监测频次的选择以及现场原始记录等方面进行了探讨,结合多年现场监测工作实践,提出了一些解决办法,使现场监测工作更具规范性和有效性。 相似文献
10.
气候资源是影响动物行为、发育、存活、繁殖与分布等的重要因子。为了探明广西邦亮东黑冠长臂猿栖息地的气候环境特征,对其栖息地附近县(乡)的主要气象要素进行统计与分析。结果表明:广西邦亮东黑冠长臂猿栖息地年均日照时数为1 521.8小时,月变幅为25.44%;年均气温为19.1℃,最冷月平均气温为11.0℃,最热月平均气温为25.0℃;年均降雨量为1 606.3 mm,月变幅为86.05%;年均蒸发量为1 507.1 mm,月变幅为28.06%;年均相对湿度为80%,月变幅为2.60%;年均风速为1.5 m/s,月变幅为15.4%。 相似文献