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281.
以某污水厂的氧化沟污泥和剩余污泥为培养对象,获得了SRB占优的厌氧污泥,分析了活性污泥厌氧驯化过程中微生物的分布规律,考察了不同种类SRB污泥固定化小球处理水中硫酸根、锌及镉的效果.结果表明:pH6.0~7.0,温度35℃,硫酸盐浓度4g/L,时间在24h时,剩余污泥固定化小球处理含Zn(II)400mg/L的废水,去除率达到100%,氧化沟污泥固定化小球Zn(II)的去除率为90%左右;对500mg/L含镉废水,剩余污泥固定化小球8h能去除水中95?(II),氧化沟污泥固定化小球对Cd(II)的去除率为80%.硫酸盐还原菌污泥固定化技术中剩余污泥优于氧化沟污泥. 相似文献
282.
Nini Pang Jian Gao Fei Che Tong M Su Liu Yan Yang Pusheng Zhao Jie Yuan Jiayuan Liu Zhongjun Xu Fahe Chai 《环境科学学报(英文版)》2020,32(9):201-209
To investigate the cause of fine particulate matter (particles with an aerodynamic diameter less than 2.5 µm, PM2.5) pollution in the heating season in the North China Plain (specifically Beijing, Tianjin, and Langfang), water-soluble ions and carbonaceous components in PM2.5 were simultaneously measured by online instruments with 1-hr resolution, from November 15, 2016 to March 15, 2017. The results showed extreme severity of PM2.5 pollution on a regional scale. Secondary inorganic ions (SNA, i.e., NO3?+SO42+ NH4+) dominated the water-soluble ions, accounting for 30%-40% of PM2.5, while the total carbon (TC, i.e., OC + EC) contributed to 26.5%-30.1% of PM2.5 in the three cities. SNA were mainly responsible for the increasing PM2.5 pollution compared with organic matter (OM). NO3? was the most abundant species among water-soluble ions, but SO42- played a much more important role in driving the elevated PM2.5 concentrations. The relative humidity (RH) and its precursor SO2 were the key factors affecting the formation of sulfate. Homogeneous reactions dominated the formation of nitrate which was mainly limited by HNO3 in ammonia-rich conditions. Secondary formation and regional transport from the heavily polluted region promoted the growth of PM2.5 concentrations in the formation stage of PM2.5 pollution in Beijing and Langfang. Regional transport or local emissions, along with secondary formation, made great contributions to the PM2.5 pollution in the evolution stage of PM2.5 pollution in Beijing and Langfang. The favourable meteorological conditions and regional transport from a relatively clean region both favored the diffusion of pollutants in all three cities. 相似文献
283.
为了探明阅海湖水生态承载力状况与变化趋势,作者在2015-2017年冬(1月)、春(4月)、夏(7月)、秋(10月)采集阅海湖水样和水生生物样本,测定高锰酸盐指数等10个水质指标、水生生物密度指标,计算生物多样性指数,构建水生态承载力评价指标体系,采用层次分析法建立层次结构模型,从水生态支持力和水环境压力2个方面来综合评价阅海湖的水生态承载力。结果显示:(1)阅海湖压力指数、承载指数和水生态承载力指数变化规律相同,季节性变化显著,均为夏季最大,冬季最小;(2)阅海湖夏季为较高压、低承载状态,冬季为低压、弱承载状态;(3)2015-2017年阅海湖水生态承载力指数分别为:0.32、0.34、0.33。阅海湖水生态承载能力整体呈弱可承载状况,生态系统抗外界干扰能力和自我恢复能力有待提高,氮是影响阅海湖水生态承载力最重要的指标,应从源头上减少氮等营养盐进入湖泊。 相似文献
284.
Guangxu Liu Xueliang Chai Yanqing Shao Lihua Hu Qilang Xie Hongxi Wu 《环境科学学报(英文版)》2011,23(2):330-335
Computer assisted movement tracking was used to characterize the motility of two marine microalgae, Isochrysis galbana
and Tetraselmis chui, and to investigate the toxicity of Cu, Pb, and Cd on motile percentage, curvilinear velocity, average path
velocity, straight line velocity, linearity, straightness, and wobble. Except for motile percentage, all other motility parameters di ered
significantly between I. galbana and T. chui. Based on relative motile percentage data, the median e ective concentration (EC50) of Cu
on the motility of I. galbana and T. chui was 31.4 and 1.3 mol/L, respectively, while for Pb it was 37.8 and 10.9 mol/L and for Cd it
was 121.6 and 37.8 mol/L, respectively. Compared to I. galbana, T. chui was more sensitive to all tested metals. The toxic e ect of the
heavy metals on motility exhibited the following decreasing order for both species: Cu > Pb > Cd. Our results indicate that I. galbana
and T. chui motility is sensitive to heavy metals and can be used as an indicator for toxicology bioassays. 相似文献
285.
To explore human biomonitor of persistent organic pollutants (POP) for public health risk assessment, extractable organohalogens (EOX), extractable persistent organohalogens (EPOX) and some selected organochlorine pesticides (OCP) and polychlorinated biphenyls (PCB) in children hair from urban and rural regions of Beijing, China, were measured by instrumental neutron activation analysis (INAA) and gas chromatography-electron capture detector (GC-ECD). The results indicated that about 96% of the total halogens existed as water-soluble polar compounds; about 25 to 50% of EOX were sulfuric acid-resistant EPOX; organochlorines were the major fraction of the organohalogens; and 88 to 99.6% of extractable persistent organochlorines (EPOCl) cannot be attributed to the selected OCP and PCB. HCH, DDT and 2-5CB were the major contributors to hair OCP and PCB. Further, gamma-HCH, p,p'-DDE, p,p'-DDT and PCB-52 were the predominant individuals of HCH, DDT and 2-5CB, respectively. The concentration distributions of EPOCl, HCH, DDT and PCB in children hair were generally in the order of urban>rural and girls>boys, except for PCB congeners with random distributions between genders. Pearson positive correlations between hair lipid and the detected parameters of hair gamma-HCH (p<0.01), DDT (p<0.01), EOCl (p<0.05), as well as EPOCl (p<0.05) were observed. Also, the ratios of hair alpha/gamma and p,p'-DDE/p,p'-DDT suggested that fresh input of HCH and DDT might exist in Beijing area. Hair can reflect body's integral exposure to POP from endogenous and exogenous sources, which, thus, can be used as a potential biomonitor in assessing POP exposure for public health purposes. 相似文献
286.
The SO2 emission sources of the Chengdu-Chongqing economic zone were divided into 556 emissions units according to four different categories, which are city, industry, point sources, and area sources. The CALPUFF model was used to calculate the contribution of each unit, and consequently obtain an influence-transferring matrix. To ensure that the SO2 concentrations of 46 cities and counties in the Chengdu-Chongqing economic zone meet air quality standards, an emission optimization model was developed to calculate optimal emissions of each emission unit under different development scenarios. The result showed the optimal emissions of SO2 by different provinces and industries. To achieve the target of restricting and optimizing development, corresponding planning programs were developed for every district. 相似文献
287.
清洁生产审核是企业实现清洁生产最为有力和高效的工具之一,如今已广泛应用于各行各业。某卷烟厂结合自身清洁生产工作现状,采用清洁生产审核思路和程序,在审核过程中查找生产的薄弱环节,从生产的各个方面系统分析问题及其产生原因,并提出、实施了系列针对性清洁生产方案。该卷烟厂开展清洁生产审核的实践证明,清洁生产审核为企业走可持续发展道路奠定了坚实的基础,是企业实现环境效益和经济效益的双赢必由之路。 相似文献
288.
289.
290.
Zheng Xiaoqi Chai Qimin Chen Yi Li Xiaomei 《Environmental science and pollution research international》2023,30(1):36-43
Environmental Science and Pollution Research - Assessing the mitigation effect on greenhouse gas (GHG) reduction of the National VI Emissions Standard bears great significance in enhanced actions... 相似文献