全文获取类型
收费全文 | 1311篇 |
免费 | 120篇 |
国内免费 | 387篇 |
专业分类
安全科学 | 100篇 |
废物处理 | 42篇 |
环保管理 | 101篇 |
综合类 | 773篇 |
基础理论 | 207篇 |
污染及防治 | 222篇 |
评价与监测 | 307篇 |
社会与环境 | 42篇 |
灾害及防治 | 24篇 |
出版年
2024年 | 14篇 |
2023年 | 19篇 |
2022年 | 55篇 |
2021年 | 51篇 |
2020年 | 60篇 |
2019年 | 48篇 |
2018年 | 57篇 |
2017年 | 71篇 |
2016年 | 81篇 |
2015年 | 89篇 |
2014年 | 96篇 |
2013年 | 167篇 |
2012年 | 116篇 |
2011年 | 140篇 |
2010年 | 89篇 |
2009年 | 106篇 |
2008年 | 67篇 |
2007年 | 92篇 |
2006年 | 63篇 |
2005年 | 58篇 |
2004年 | 29篇 |
2003年 | 36篇 |
2002年 | 28篇 |
2001年 | 24篇 |
2000年 | 27篇 |
1999年 | 12篇 |
1998年 | 26篇 |
1997年 | 17篇 |
1996年 | 15篇 |
1995年 | 15篇 |
1994年 | 8篇 |
1993年 | 14篇 |
1992年 | 3篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有1818条查询结果,搜索用时 15 毫秒
441.
双道氢化物原子荧光法测定水和土壤中的砷 总被引:5,自引:0,他引:5
用AFS-2201双道氢化物发生原子荧光法测定水、土壤样品中的砷含量,方法简捷、快速、准确,二次污染物少.HNO3浓度大于5ppm时,对测量结果有影响.主机通过与微机相联可直接得出监测数据,大大减轻了监测人员的工作量,测定结果令人满意. 相似文献
442.
植物油烟组分的色质联机分析 总被引:1,自引:0,他引:1
将植物油烟采集在玻璃纤维滤筒中 ,用环己烷处理样品 ,样品经过净化处理 ,然后进行色质联机分析。对油烟化学成分的分析有助于人们研究油烟对人体健康的影响 相似文献
443.
444.
四城市空气粗、细颗粒物元素质量谱及富集特征 总被引:3,自引:0,他引:3
以武汉市 X荧光光谱分析数据为例 ,介绍了粗、细颗粒物中元素的质量谱及富集特征。并且 ,比较了广州、武汉、兰州、重庆四城市的污染元素及可能污染元素的某些富集特征 相似文献
445.
HAN Hai-yan HUANG Guo-dong JIN Shun-ping ZHENG Pei-chao XU Guo-hu LI Jian-quan WANG Hong-mei CHU Yan-nan 《环境科学学报(英文版)》2007,19(6):751-755
Ion mobility spectrometry (IMS) is a very fast, highly sensitive, and inexpensive technique, it permits efficient monitoring of volatile organic compounds like alcohols. In this article, positive ion mobility spectra for six alcohol organic compounds have been systematically studied for the first time using a high-resolution IMS apparatus equipped with a discharge ionization source. Utilizing protonated water cluster ions (H2O)nH^+ as the reactant ions and clean air as the drift gas, alcohol organic compounds, ethanol, 1- propanol, 2-propanol, 1-butanol, 1-pentanol and 2-octanol, all exhibit product ion characteristic peaks in their respective ion mobility spectrometry, that is a result of proton transfer reactions between the alcohols and reaction ions (H2O)nH^+. The mixture of these alcohols, including two isomers, has been detected, and the results showed that they could be distinguished effectively in the ion mobility spectrum. The reduced mobility values have been determined, which are in very well agreement with the traditional ^63Ni-IMS experimental values. The exponential dilution method was used to calibrate the alcohol concentrations, and a detection limit available for the alcohols is in order of magnitude of a few ng/L. 相似文献
446.
Spatio-temporal variations of biochemical oxygen demand (BOD) and total coliform (TC) in the Han River, Korea, were investigated
in terms of concentration-based and mass loading-based approaches. Considering the river water quality criteria regulated
by the Ministry of Environment in Korea, the tributaries linked to the mainstream of the Han River were found to be highly
contaminated with respect to both BOD and TC and, in fact, most of the tributaries exceeded the maximum water quality criteria.
To evaluate the pollution impact of tributaries on the mainstream, the monthly water quality monitoring data for six years
(from 1995 to 2000) were collected from the Han River basin, and statistically analyzed using Pearson’s correlation coefficient.
The results revealed that mass loading-based approach was superior to the concentration-based approach for effective Han River
watershed management. Overall results supported that the mass loading-based approach associated with total maximum daily loads
(TMDL) management would be a useful and suitable protocol in watershed management for improving the water quality of the Han
River and protecting public health. Therefore, this study supporting TMDL management can be applicable to a wide array of
contaminants and watershed settings in Korea. 相似文献
447.
建立了ASE-GPC—GC-QqQ—MS/MS测定土壤中17种有机氯农药和19种多氯联苯以及MAE-SPE—GC-QqQ—MS/MS测定土壤中16种多环芳烃和18种邻苯二甲酸酯的方法。多环芳烃和邻苯二甲酸酯定量限在0.02~2.81μg/kg之间,有机氯农药和多氯联苯定量限在0.01~0.51μg/kg之间。样品加标浓度在5μg/kg时多环芳烃和邻苯二甲酸酯的平均回收率在66.6%~122.1%之间,相对标准偏差均小于20%;有机氯农药和多氯联苯平均回收率在79.6%~93.2%之间,相对标准偏差均小于15%。 相似文献
448.
Recent studies indicate that secondary ozonides of cyclic alkenes are formed in atmospheric reactions and may be relatively stable. The secondary ozonides (SOZs) of cyclohexene (1), 1-methylcyclohexene (2), 4-isopropyl-1-methylcyclohexene (3) and 4-isopropenyl-1-methylcyclohexene (limonene) (4) have been characterized by rapid gas chromatography electron ionization (EI), negative and positive chemical ionization (CI: ammonia, isobutane and methane) and collision-induced dissociation (CID) mass spectrometry. Both EI and positive CI spectra were found unsuitable for reproducible analysis. However, negative CI showed stable (M−H)− ions with minor fragmentation. CID of the (M−H)− ions resulted in simple and reproducible fragmentation patterns for all four SOZs with loss of m/z 18, 44 and 60, tentatively assigned as H2O, CO2 and C2H4O2 or CO3, respectively. Thus, negative CI-MS–MS in combination with rapid gas chromatography is the preferred method for identification of secondary ozonides of cyclohexenes. 相似文献
449.
Phenylated arsenic compounds occur as highly toxic contaminants in former military areas where they were formed as degradation products of chemical warfare agents. Some phenylarsenic compounds such as roxarsone and aminophenylarsonic acids were applied as food additive and veterinary drugs in stock-breeding and therefore pose an environmental risk in agricultural used sites. Very few data exist in the literature concerning uptake and effects of phenylarsenic compounds in plants growing on contaminated soils. In this study, the accumulation, extractability, and metabolization of five different phenylarsenic compounds, phenylarsonic acid, p- and o-aminophenylarsonic acid, phenylarsine oxide, and 3-nitro-4-hydroxyphenylarsonic acid called roxarsone, by the terrestrial plant Tropaeolum majus were investigated. Ion chromatography coupled to inductively coupled plasma mass spectrometry was used to differentiate these arsenic compounds, and inductively coupled plasma atomic emission spectroscopy was used for total arsenic quantification. All compounds considered were taken up by the roots and transferred to stalks, leaves, and flowers. The strongest accumulation was observed for unsubstituted phenylarsonic acid followed by its trivalent analogue phenylarsine oxide that was mostly oxidized in soil whereas the amino- or nitro- and hydroxy-substituted phenylarsonic acids were accumulated to a smaller degree.The highest extraction yield of 90% for ground leaf material was achieved by 0.1 M phosphate buffer, pH 7.7, in a two-step extraction with a total extraction time of 24 h. The extraction of higher amounts of arsenic (50–70% of total arsenic present in leaves depending on arsenic species application) from non-ground intact leaves with deionized water in comparison with the buffer (20–40% of total arsenic) is ascribed to osmotic effects. The arsenic species analysis revealed a cleavage of the amino groups from the phenyl ring for plants treated with aminophenylarsonic acids. A further important metabolic effect consisted in the production of inorganic arsenate and arsenite from the phenylated arsonic acid groups. 相似文献
450.
Soylak M Divrikli U Saracoglu S Elci L 《Environmental monitoring and assessment》2007,127(1-3):169-176
Cellulose nitrate membrane filter was used for the preconcentration-separation of Cu, Co, Cd, Pb and Cr ions. The analyte
ions were collected on the membrane filter by the aid of carmine. Then membrane filter was dissolved by using nitric acid.
The levels of the analytes in the final solutions were determined by flame atomic absorption spectrometry (FAAS). The analytical
parameters including pH, amounts of carmine, sample volumes etc. have been optimized. No influences have been observed from
the matrix ions. The detection limits for analytes were in the range of 0.08 μg/l-0.93 μg/l. The validation of the procedure
was checked by the analysis of standard reference sediment (GBW 07309). The present method has been successfully applied for
the FAAS determinations of analyte ions in real samples including black tea and magnesium salts. 相似文献