全文获取类型
收费全文 | 18517篇 |
免费 | 1373篇 |
国内免费 | 4199篇 |
专业分类
安全科学 | 982篇 |
废物处理 | 288篇 |
环保管理 | 4858篇 |
综合类 | 10931篇 |
基础理论 | 2320篇 |
环境理论 | 7篇 |
污染及防治 | 1636篇 |
评价与监测 | 1421篇 |
社会与环境 | 1405篇 |
灾害及防治 | 241篇 |
出版年
2024年 | 98篇 |
2023年 | 375篇 |
2022年 | 568篇 |
2021年 | 581篇 |
2020年 | 657篇 |
2019年 | 536篇 |
2018年 | 484篇 |
2017年 | 729篇 |
2016年 | 886篇 |
2015年 | 918篇 |
2014年 | 940篇 |
2013年 | 1238篇 |
2012年 | 1349篇 |
2011年 | 1403篇 |
2010年 | 1078篇 |
2009年 | 1034篇 |
2008年 | 796篇 |
2007年 | 1274篇 |
2006年 | 1228篇 |
2005年 | 987篇 |
2004年 | 864篇 |
2003年 | 827篇 |
2002年 | 704篇 |
2001年 | 577篇 |
2000年 | 558篇 |
1999年 | 469篇 |
1998年 | 311篇 |
1997年 | 308篇 |
1996年 | 271篇 |
1995年 | 234篇 |
1994年 | 219篇 |
1993年 | 196篇 |
1992年 | 146篇 |
1991年 | 113篇 |
1990年 | 90篇 |
1989年 | 84篇 |
1988年 | 77篇 |
1987年 | 69篇 |
1986年 | 48篇 |
1984年 | 47篇 |
1983年 | 57篇 |
1982年 | 58篇 |
1981年 | 74篇 |
1980年 | 81篇 |
1979年 | 74篇 |
1978年 | 50篇 |
1977年 | 48篇 |
1973年 | 45篇 |
1972年 | 38篇 |
1971年 | 61篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
对色泽较深,含杂质量较高的废水加硅油I以抑制测定中蒸馏产生的泡沫.结果表明,在250ml水样中加硅油IO.10~1.25ml,即可收到理想效果.硅油I性质稳定,不随水蒸汽蒸出,对测定无干扰. 相似文献
92.
在介绍伊犁地区矿泉水资源与形成的水文地质条件的基础上,分析了矿泉水的化学组成及其特征,并给出了水化学类型。 相似文献
93.
本文讨论了水环境数学模型的选择及在水质管理规划中的使用方法,达到实用的目的.具有广泛的通用性和实用性. 相似文献
94.
研究了乌鲁木剂铁路局系统污水治理污染控制方法及途径,提出了主要污染物为石油类,其最佳治理对策是:确定重点污染单位、污染源、用最低的治理投入,选择斜板隔油气浮工艺治理重点污染和次重点污染部门,得到较好的治理效果,否定盲目追求“零排放”的高投入方案。 相似文献
95.
96.
97.
乌伦古湖水质现状及污染防治对策 总被引:7,自引:0,他引:7
着重对乌伦古湖所监测的项目作了全面系统的分析,评价了该湖的水环境质量,指出乌伦古湖水质的主要问题是严重咸化,这是该湖可持续发展的最大障碍。并指出做好湖区规划,增加水源供给,加强污水处理和湿地建设,是乌伦古湖未来发展的有利措施。 相似文献
98.
Sánchez-Camazano M Lorenzo LF Sánchez-Martín MJ 《Environmental monitoring and assessment》2005,105(1-3):11-24
The inputs of atrazine and alachlor herbicides to surface and ground waters from irrigated areas dedicated to corn cultivation in the Castilla-León (C-L) region (Spain) as related to the application of both herbicides were studied. Enzyme-linked immunosorbent assays (ELISA) were used for monitoring the atrazine and alachlor concentrations in 98 water samples taken from these areas. Seventy-nine of the samples were of ground waters and 19 were of surface waters. The concentration ranges of the herbicides detected in the study period (October 1997–October 1998) were 0.04–25.3 g L–1 in the surface waters and 0.04–3.45 g L–1 in the ground waters for atrazine, and 0.06–31.9 g L–1 in the surface waters and 0.05–4.85 g L–1 in the ground waters in the case of alachlor. The highly significant correlation observed between the concentrations of both herbicides in the surface waters (r = 0.89, p < 0.001) pointed to a parallel transport of atrazine and alachlor to these waters. A study was made of the temporal evolution of the concentrations of both herbicides, and it was found a maximum recharge of atrazine in the ground waters for April 1998 and of alachlor in October 1997 and October 1998. The temporal evolution of the concentrations of both herbicides in surface waters was parallel. The highly significant correlations observed between atrazine concentrations determined by ELISA and by HPLC (r = 0.92, p < 0.001) and between alachlor concentrations also determined by both methods (r = 0.96, p < 0.001) confirmed the usefulness of ELISA for monitoring both herbicides in an elevated number of samples. Using HPLC, the presence in some waters of the alachlor ethanesulfonate (ESA) metabolite was found at a concentration range of 0.52–4.01 g L–1. However the interference of ESA in the determination of alachlor by ELISA was negligible. The inputs of atrazine and alachlor to waters found in this study, especially the inputs to ground waters, could pose a risk for human health considering that some waters, though sporadically, are even used for human consumption. 相似文献
99.
Lisa A. Baron Tom L. Ashwood Bradley E. Sample Christopher Welsh 《Environmental monitoring and assessment》1997,47(2):153-165
The belted kingfisher (Ceryle alcyon), acommon piscivore in the eastern United States, hasbecome a common endpoint in ecological riskassessments (ERA) because of their high consumptionof potentially contaminated aquatic prey. Whilebioaccumulation data and biosurveys may be used tosupport conclusions of ERAs for kingfishers, thereare currently no published data on contaminantconcentrations in kingfishers. Additionally,methods available for collecting biological samples(e.g., feathers, eggs, food debris, etc.) fromkingfisher burrows can be detrimental to thereproductive success of the birds. We present amethod for obtaining samples from burrows during orfollowing the nesting season. The method wasapplied to kingfisher burrows on the Oak RidgeReservation (ORR) in eastern Tennessee. Feathers,eggshells, and nestlings were collected from burrows and analyzed. In addition, carcasses ofthree adult kingfishers found dead on the ORR wereanalyzed. Metals and radionuclides were accumulatedby both juvenile and adult birds. Body burdens ofcadmium, lead, and cesium-137 in adult birds were belowlevels associated with toxicity. Concentrations of selenium and mercury were observed at potentiallytoxic levels. Contaminants in eggshells andnestling feathers indicate exposure, however, thereis insufficient information to evaluate thetoxicological significance of this contamination.National Laboratory Oak Ridge National Laboratory is managed for the U.S. Department of Energy by Lockheed Martin Energy Research Corp. under contract DE-AC05-96OR22464 相似文献
100.