全文获取类型
收费全文 | 444篇 |
免费 | 18篇 |
国内免费 | 201篇 |
专业分类
安全科学 | 24篇 |
废物处理 | 21篇 |
环保管理 | 38篇 |
综合类 | 253篇 |
基础理论 | 85篇 |
污染及防治 | 185篇 |
评价与监测 | 28篇 |
社会与环境 | 11篇 |
灾害及防治 | 18篇 |
出版年
2023年 | 6篇 |
2022年 | 21篇 |
2021年 | 18篇 |
2020年 | 16篇 |
2019年 | 13篇 |
2018年 | 17篇 |
2017年 | 19篇 |
2016年 | 26篇 |
2015年 | 32篇 |
2014年 | 32篇 |
2013年 | 52篇 |
2012年 | 38篇 |
2011年 | 47篇 |
2010年 | 36篇 |
2009年 | 25篇 |
2008年 | 40篇 |
2007年 | 32篇 |
2006年 | 23篇 |
2005年 | 13篇 |
2004年 | 13篇 |
2003年 | 12篇 |
2002年 | 21篇 |
2001年 | 12篇 |
2000年 | 13篇 |
1999年 | 13篇 |
1998年 | 14篇 |
1997年 | 19篇 |
1996年 | 17篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
排序方式: 共有663条查询结果,搜索用时 15 毫秒
51.
52.
Bromine-contained disinfectants and biocides are widely used in swimming pools, recreational waters and cooling towers. The objective of this study was to evaluate the formation of thrihalomethanes (THMs) and haloacetonitriles (HANs) and their cytotoxicity in algae solutions during free bromine disinfection. Disinfection by-products formation potential experiments were conducted using model solutions containing 7 mg/L (as total organic carbon) Microcystis aeruginosa cells. Effects of free bromine dosage, pH and ammonia were investigated. The results showed that brominated disinfection by-products were the major products when free bromine was applied. The total THMs formed during bromination was much as that formed during chlorination, whereas HANs were elevated by using bromination instead of chlorination. Dibromoacetonitrice (C2H2NBr2 ) and bromoform (CHBr3 ) were the only detected species during free bromine disinfection. The production of C2H2NBr2 and CHBr 3 increased with disinfectant dosage but decreased with dosing ammonia. CHBr3 increased with the pH changing from 5 to 9. However, C2H2NBr2 achieved the highest production at neutral pH, which was due to a joint effect of variation in hydrolysis rate and free bromine reactivity. The hydrolysis of C2H2NBr2 was base-catalytic and nearly unaffected by disinfectant. Finally, estimation of cytotoxicity of the disinfected algae solutions showed that HANs formation was responsible for the majority of toxicity. Considering its highest toxicity among the measured disinfection by-products, the elevated C2H2NBr2 should be considered when using bromine-related algaecide. 相似文献
53.
根据锦州市环境监测中心站的大气资料,通过对其3个采样点,从2001年到2010年共10年的监测数据进行综合分析,结果表明锦州地区酸雨多出现在5、6、7月,以SO42-、NO3-和NH4+、Ca2+为主要污染离子,体现了大气降水煤烟型污染的特点。通过对数据的综合分析,研究锦州市降水现状及发展变化趋势,分析了酸雨的成因并提出了酸雨控制的对策。 相似文献
54.
Yuxue Kong Xurong Bai Jie Wei Yanqin Ren Rui Gao Fahe Chai Hong Li Fei Xu 《环境科学学报(英文版)》2023,123(1):169-182
Polycyclic aromatic hydrocarbons(PAHs) and their nitrated derivatives(NPAHs) attract continuous attention due to their outstanding carcinogenicity and mutagenicity. In order to investigate the diurnal variations, sources, formation mechanism, and health risk assessment of them in heating season, particulate matter(PM) were collected in Beijing urban area from December 26, 2017 to January 17, 2018. PAHs and NPAHs in PM were quantitatively analyzed via gas chromatography-mass spectrometry(GC-MS). ... 相似文献
55.
利用蚕豆根法细胞和人在淋巴细胞的微核试验对6种硝基芳烃化合物的致突变性进行比较研究,结果表明,邻二硝基苯、间二硝基苯、2,4-二硝基甲苯,2,6-二硝基甲苯,对硝基氯苯和对硝基溴苯均能诱发两咱细胞的微核率增加,除了对硝基溴苯外均具有明显剂量一效应关系。引进标准剂量概念比较5种硝基芳烃人合物的致突变性,结果表明,致突变性强弱依次为2,4-二硝基甲苯〉对硝基氯苯〉间二硝基苯〉2,6-二硝基甲苯〉邻二硝 相似文献
56.
57.
58.
59.
氧化沟工艺由于进水中含有大量的无机颗粒,无机颗粒的沉淀导致沟内积泥较厚。为了不影响正常生产,依据经验数据,依次对1号、2号氧化沟安装底推。对沟内积泥情况及影响因素进行分析比较,得出氧化沟的积泥主要由进水中密度较大的无机颗粒造成,且积泥规律与底推安装位置和运行情况相关。 相似文献
60.