全文获取类型
收费全文 | 246篇 |
免费 | 17篇 |
国内免费 | 59篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 27篇 |
环保管理 | 22篇 |
综合类 | 161篇 |
基础理论 | 35篇 |
污染及防治 | 53篇 |
评价与监测 | 11篇 |
社会与环境 | 2篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 7篇 |
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2015年 | 11篇 |
2014年 | 17篇 |
2013年 | 16篇 |
2012年 | 14篇 |
2011年 | 26篇 |
2010年 | 15篇 |
2009年 | 23篇 |
2008年 | 16篇 |
2007年 | 22篇 |
2006年 | 12篇 |
2005年 | 11篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 12篇 |
2001年 | 7篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 10篇 |
1997年 | 7篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1978年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有322条查询结果,搜索用时 15 毫秒
31.
Bruce W. Loum W. Thomas Shoaf 《Journal of the American Water Resources Association》1978,14(1):190-194
Abstract: Chlorophyll analyses of both laboratory cultures and natural aquatic samples were unaffected by the use of magnesium carbonate. Equal volumes of the samples (at various pH values) were pipetted onto 0.45 micrometer filters with and without magnesium carbonate. Chlorophyll concentrations were determined for each filtered sample and those frozen for specified times. In all samples tested there was no difference either in the retention of algae or in the stability of chlorophyll over the time period and pH range tested. 相似文献
32.
铁基硅盐对土壤环境镉砷赋存形态及转化影响 总被引:1,自引:0,他引:1
为探明铁基硅盐对土壤镉砷赋存形态影响及各形态间转化规律,采用室内长期淹水培养吸附实验,研究不同比例铁硅材料对土壤离子态镉砷活性影响;筛选适宜铁基硅盐(FS)配比同时添加腐殖酸(FSC)和金属氧化物(FSCa),明确复配处理土壤中镉砷分级形态转化程度.结果显示,铁:硅比值增加10%,土壤pH值平均降低0.35;F2-S8处理土壤离子态镉降幅71%;F10-S0处理土壤离子态砷降低59.9%,离子态镉砷含量与硅酸盐-铁盐施用量互呈反比;处理F4-S6和F6-S4之间镉、砷钝化率产生交点,约为25%~30%.土壤中镉主要以可溶态为主,占比58%;砷主要以铁铝氧化态和钙结合态为主,占比40%和23%.铁硅比例为5:5或5.5:4.5左右复配能有效将铝结合态砷和铁铝氧化态砷转变为钙结合态砷和残渣态砷,可溶态镉转化为碳酸盐结合态镉以及铁锰氧化态镉,同步降低土壤中镉砷的活性. 相似文献
33.
34.
L. Trotignon M. -H. Faur A. Stietel C. Riglet-Martial M. Sardin P. Vitorge F. Lefvre 《Journal of contaminant hydrology》1997,26(1-4)
This work presents an intercomparison exercise between two geochemical migration codes, TRIO-EF (an object-oriented finite element code) and IMPACT (a chemical engineering code using mixing cells in series). The predictions of the two codes are compared with the reference experimental results obtained in a previous study of strontium transport in soil columns. This simulated geochemical system is well documented and includes ion exchange and dissolution-precipitation reactions. The solution transport is simulated by a one-dimensional advection-dispersion model. The predictions of TRIO-EF and IMPACT are both in good agreement with the experimental results. However, slight differences can be observed between the two codes, especially when concentration discontinuities are involved, such as precipitation fronts or changes in boundary conditions. These discrepancies between the two codes can mainly be attributed to the different discretisation approaches. 相似文献
35.
36.
Calcium carbonate (CaCO3) application is widely used to ameliorate soil acidification. To counteract soil and bacterial community response to CaCO3 application in an acidic paddy soil in southern China, a field experiment was conducted with four different dosages of CaCO3 addition, 0, 2.25, 4.5 and 7.5?tons/ha, respectively. After one seasonal growth of rice, soil physicochemical properties, soil respiration and bacterial communities were investigated. Results showed that soil pH increased accordingly with increasing dose of CaCO3 addition, and 7.5?tons/ha addition increased soil pH to neutral condition. Moderate dose of CaCO3 application (4.5?tons/ha) significantly increased soil dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) content, enhanced soil respiration, while the excessive CaCO3 application (7.5?tons/ha) decreased these soil properties. High-throughput sequencing results illustrated that moderate dose of CaCO3 application increased the richness and alpha diversity of soil bacterial community. Compared with control, the relative abundance of Anaerolineaceae family belonging to Chloroflexi phylum increased by 38.7%, 35.4% and 24.5% under 2.25, 4.5 and 7.5?tons/ha treatments, respectively. Redundancy analysis (RDA) showed that soil pH was the most important factor shaping soil bacterial community. The results of this study suggest that proper dose of CaCO3 additions to acid paddy soil in southern China could have positive effects on soil properties and bacterial community. 相似文献
37.
本文对以稳定剂H_2O_2和Na_2CO_3与ClO_2制备的所谓"稳定性二氧化氯"溶液的UV吸收光谱、纸层析特性、微观结构及离子色谱进行了分析,并与纯NaClO_2及ClO_2溶液做了对比.结果表明,“稳定性二氧化氯” 与NaClO_2在UV吸收光谱、层析比移值、微观结构、离子色谱这几方面都具有很好或极其相似的一致性 表明“稳定性二氧化氮’与NaClO_2溶液中氯氧化物存在型体的一致性.因此,认为“稳定性二氧化氯“溶液中ClO_2是以亚氯酸盐ClO_2~-的型体存在的. 相似文献
38.
NaCl,Na2CO3胁迫下星星草根际K^+,Na^+,Ca^2+的生理行为 总被引:16,自引:1,他引:16
对星星草施加25~600mmol·L-1NaCl及12.5~200mmol·L-1Na2CO3的盐胁迫处理,分析其根际K+、Na+、Ca2+的生理行为.结果表明:Na2CO3对培养液中K+、Na+、Ca2+活度的影响大于NaCl,其中Na2CO3使Ca2+活度极度下降;营养液中K+、Na+、Ca2+活度与星星草根中K+、Na+含量密切相关,其中,根中K+、Na+含量与营养液中Ca2+活度和Na+活度平方之比即(Ca2+)/(Na+)2之间具有一致的曲线关系,根系环境中的(Ca2+)/(Na+)2对植物K+、Na+吸收有决定性作用.星星草地上部分K+、Na+含量与其根中K+、Na+含量也相关.根(DW)中K+在0.38~0.52mmol·g-1间可维持地上部分K+含量基本稳定.根中Na+含量较低时,地上部分Na+含量随根中含量升高而平缓上升.但根中Na+高至一定值时,地上部分Na+转而急剧上升,提示星星草在由根向上转运K+、Na+的过程中有一定调控作用. 相似文献
39.
40.
A novel sorbent based on 2% grape stalk wastes encapsulated in calcium alginate beads was investigated for the removal of Cr(VI) and Cr(III) from aqueous solutions. The sorbent proved to be efficient for chromium removal in both hexavalent and trivalent forms from aqueous solution at pH 3.0. In binary mixtures, the presence in solution of one of the forms enhances the sorption of the other which results in an increase of the amount of total chromium removed. This study suggests that the proposed sorbent can be used for the removal of chromium from wastewaters through a cost-effective and environmentally friendly process. 相似文献