全文获取类型
收费全文 | 1701篇 |
免费 | 240篇 |
国内免费 | 1349篇 |
专业分类
安全科学 | 164篇 |
废物处理 | 159篇 |
环保管理 | 154篇 |
综合类 | 1982篇 |
基础理论 | 388篇 |
污染及防治 | 353篇 |
评价与监测 | 64篇 |
社会与环境 | 17篇 |
灾害及防治 | 9篇 |
出版年
2024年 | 13篇 |
2023年 | 52篇 |
2022年 | 136篇 |
2021年 | 146篇 |
2020年 | 117篇 |
2019年 | 122篇 |
2018年 | 120篇 |
2017年 | 119篇 |
2016年 | 123篇 |
2015年 | 134篇 |
2014年 | 169篇 |
2013年 | 216篇 |
2012年 | 206篇 |
2011年 | 183篇 |
2010年 | 118篇 |
2009年 | 137篇 |
2008年 | 132篇 |
2007年 | 156篇 |
2006年 | 143篇 |
2005年 | 113篇 |
2004年 | 97篇 |
2003年 | 89篇 |
2002年 | 79篇 |
2001年 | 69篇 |
2000年 | 58篇 |
1999年 | 39篇 |
1998年 | 55篇 |
1997年 | 38篇 |
1996年 | 14篇 |
1995年 | 32篇 |
1994年 | 17篇 |
1993年 | 20篇 |
1992年 | 7篇 |
1991年 | 9篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有3290条查询结果,搜索用时 31 毫秒
931.
Rhind SM Kyle CE Mackie C Yates K Duff EI 《Environmental pollution (Barking, Essex : 1987)》2011,159(2):416-422
Muscle tissue was collected from ewes and lambs derived from farms throughout Scotland and sample concentrations of five endocrine disrupting compound groups were determined. Farms of origin were categorised according to geographic region. There were few statistically-significant differences with region or distance from cities. However, the magnitude of the difference between the highest and lowest mean values in ewe muscle from different regions exceeded 30% for 13 of the 15 compounds that were consistently detected in muscle, with animals derived from the industrialised region having the highest mean values for 11 of the 13 compounds. A less marked trend was apparent in the lamb muscle (8 of 13 highest were in the industrialised region). The physiological effects of such small differences in exposure to mixtures of pollutants remain to be determined. 相似文献
932.
随着拟除虫菊酯类农药使用量不断增加,产生的农药残留问题对生态环境和人类健康造成了危害.对降解拟除虫菊酯类农药的微生物种类、降解酶和降解机制及降解酶基因克隆和构建工程菌等方面进行综述,旨在为研究和开发微生物降解拟除虫菊酯类农药残留提供参考. 相似文献
933.
934.
935.
936.
The objective of this study was to demonstrate the effects of complex matrix effects caused by chemical materials on the analysis of key soluble microbial products (SMP) including proteins, humics, carbohydrates, and polysaccharides in activated sludge samples. Emphasis was placed on comparison of the commonly used standard curve technique with standard addition (SA), a technique that differs in that the analytical responses are measured for sample solutions spiked with known quantities of analytes. The results showed that using SA provided a great improvement in compensating for SMP recovery and thus improving measurement accuracy by correcting for matrix effects. Analyte recovery was found to be highly dependent on sample dilution, and changed due to extraction techniques, storage conditions and sample composition. Storage of sample extracts by freezing changed SMP concentrations dramatically, as did storage at 4 °C for as little as 1 d. 相似文献
937.
Soil washing is a potential technology for rapid removal of organic hydrocarbons sorbed to soils. In this work, p-cresol desorption with different non-ionic surfactants (Tween 80, Brij 30 and Triton X-100) was compared to cyclodextrine and citrate as solubilizer. A series of batch extraction experiments were conducted at 20 °C using the field soil with different extracting solutions at various concentrations to investigate the removal efficiency and to optimize the concentration of the extractant. The use of the different extracting agents was very selective to p-cresol extraction, minimizing soil organic matter releasing and maintaining the natural pH of the soil. The highest asymptotic values of desorption percentages were obtained for Tween 80 and Brij 30 at 48 h. However, Brij 30 ecotoxicity (EC50 = 0.5 mg L−1) is in the same order of that obtained for p-cresol, being this surfactant clearly ruled out. Liquid to solid ratio of 2.5 mL g−1 presented the best extraction results, while concentrations higher than 1 g L−1 for Tween 80 and Citrate did not produce any significant effect on the desorption efficiency. p-Cresol extraction efficiencies higher than 70% and 60% for Tween 80 and Citrate, respectively. 相似文献
938.
土壤微生物是表征土壤质量最有潜力的敏感性指标,高质量的土壤应具有稳定的微生物群落组成和结构、高微生物生物量及良好的微生物活性。本文从微生物的群落组成与多样性、微生物生物量和微生物活性3个方面进行了综述。微生物指标研究目前任务是确定一套评价土壤质量的微生物学指标最小参数集。建议今后加强土壤样品收集、储存、预处理及分析方法规范化,深层土壤微生物对土壤质量的作用及建立本底土壤微生物属性数据库等方面的研究。 相似文献
939.
940.