全文获取类型
收费全文 | 33244篇 |
免费 | 415篇 |
国内免费 | 275篇 |
专业分类
安全科学 | 1057篇 |
废物处理 | 1196篇 |
环保管理 | 5022篇 |
综合类 | 5078篇 |
基础理论 | 9553篇 |
环境理论 | 27篇 |
污染及防治 | 8429篇 |
评价与监测 | 1959篇 |
社会与环境 | 1372篇 |
灾害及防治 | 241篇 |
出版年
2022年 | 210篇 |
2021年 | 222篇 |
2020年 | 195篇 |
2019年 | 268篇 |
2018年 | 478篇 |
2017年 | 478篇 |
2016年 | 708篇 |
2015年 | 580篇 |
2014年 | 805篇 |
2013年 | 2454篇 |
2012年 | 1010篇 |
2011年 | 1459篇 |
2010年 | 1181篇 |
2009年 | 1217篇 |
2008年 | 1445篇 |
2007年 | 1529篇 |
2006年 | 1352篇 |
2005年 | 1151篇 |
2004年 | 1146篇 |
2003年 | 1048篇 |
2002年 | 1045篇 |
2001年 | 1305篇 |
2000年 | 930篇 |
1999年 | 599篇 |
1998年 | 486篇 |
1997年 | 479篇 |
1996年 | 493篇 |
1995年 | 542篇 |
1994年 | 497篇 |
1993年 | 445篇 |
1992年 | 455篇 |
1991年 | 403篇 |
1990年 | 401篇 |
1989年 | 443篇 |
1988年 | 372篇 |
1987年 | 332篇 |
1986年 | 304篇 |
1985年 | 334篇 |
1984年 | 323篇 |
1983年 | 360篇 |
1982年 | 366篇 |
1981年 | 308篇 |
1980年 | 268篇 |
1979年 | 278篇 |
1978年 | 252篇 |
1977年 | 208篇 |
1976年 | 212篇 |
1975年 | 198篇 |
1974年 | 176篇 |
1972年 | 205篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
132.
133.
134.
135.
136.
Few studies have been carried out to connect nutrient recovery as struvite from wastewater and sustainable utilization of the recovered struvite for copper and zinc immobilization in contaminated soil. This study revealed the effect of struvite on Cu and Zn immobilization in contaminated bio-retention soil in the presence of commonly exuded plant organic acids. The research hypothesis was that the presence of both struvite and organic acids may influence the immobilization of Cu and Zn in soil. The outcome of this research confirmed that more than 99% of Cu and Zn was immobilized in bio-retention filter media by struvite application. Water-soluble Cu and Zn concentrations of struvite treated soil were less than 1.83 and 0.86 mg/kg respectively, and these concentrations were significantly lower compared to the total Cu and Zn content of 747.05 mg/kg in the contaminated soil. Application of struvite to Cu- and Zn-contaminated soil resulted in formation of compounds similar to zinc phosphate tetrahydrate (Zn3(PO4)2?4H2O) and amorphous Cu and Zn phases. Struvite was effective in heavy metal remediation in acidic soil regardless of the presence of Ca impurities in struvite and the presence of plant organic acids in soil. Overall, this study revealed that struvite recovered from wastewater treatment plants has potential for use as an amendment for heavy metal remediation in contaminated bio-retention soil. 相似文献
137.
Samari Mohammad Ridha Firas Manovic Vasilije Macchi Arturo Anthony E. J. 《Mitigation and Adaptation Strategies for Global Change》2020,25(1):25-41
Mitigation and Adaptation Strategies for Global Change - Direct air capture (DAC) is a developing technology for removing carbon dioxide (CO2) from the atmosphere or from low-CO2-containing... 相似文献
138.
Poliana Dutra Mai Laurence Maurice Emmanuel Tessier David Amouroux Daniel Coss Patricia Moreira-Turcq Henri Etcheber 《环境科学学报(英文版)》2018,30(6):24-40
Seasonal variability of dissolved and particulate methylmercury(F-MeHg, P-MeHg) concentrations was studied in the waters of the Amazon River and its associated Curuai floodplain during hydrological year 2005–2006, to understand the MeHg exchanges between these aquatic systems. In the oxic white water lakes, with neutral pH, high F-MeHg and P-MeHg concentrations were measured during the rising water stage(0.70 ± 0.37 pmol/L, n = 26) and flood peak(14.19 ± 9.32 pmol/g, n = 7) respectively, when the Amazon River water discharge into the lakes was at its maximum. The lowest mean values were reported during the dry season(0.18 ± 0.07 pmol/L F-MeHg, n = 10 and 1.35 ± 1.24 pmol/g P-MeHg, n = 8), when water and suspended sediments were outflowing from the lakes into the River. In these lakes,the MeHg concentrations were associated to the aluminium and organic carbon/nitrogen changes. In the black water lakes, with acidic pH and reducing conditions, elevated MeHg concentrations were recorded(0.58 ± 0.32 pmol/L F-MeHg, n = 16 and 19.82 ± 15.13 pmol/g PMeHg, n = 6), and correlated with the organic carbon and manganese concentrations. Elevated values of MeHg partition coefficient(4.87 Kd 5.08 log(L/kg) indicate that MeHg is mainly transported associated with the particulate phase. The P-MeHg enrichment detected in all lakes suggests autochthonous MeHg inputs from the sediments into the water column. The MeHg mass balance showed that the Curuai floodplain is not the source of P-MeHg for the Amazon River. 相似文献
139.
140.