全文获取类型
收费全文 | 762篇 |
免费 | 40篇 |
国内免费 | 287篇 |
专业分类
安全科学 | 42篇 |
废物处理 | 48篇 |
环保管理 | 81篇 |
综合类 | 419篇 |
基础理论 | 156篇 |
污染及防治 | 267篇 |
评价与监测 | 22篇 |
社会与环境 | 32篇 |
灾害及防治 | 22篇 |
出版年
2023年 | 13篇 |
2022年 | 32篇 |
2021年 | 31篇 |
2020年 | 23篇 |
2019年 | 22篇 |
2018年 | 30篇 |
2017年 | 34篇 |
2016年 | 29篇 |
2015年 | 45篇 |
2014年 | 54篇 |
2013年 | 88篇 |
2012年 | 67篇 |
2011年 | 52篇 |
2010年 | 36篇 |
2009年 | 43篇 |
2008年 | 54篇 |
2007年 | 33篇 |
2006年 | 43篇 |
2005年 | 24篇 |
2004年 | 24篇 |
2003年 | 15篇 |
2002年 | 25篇 |
2001年 | 28篇 |
2000年 | 28篇 |
1999年 | 31篇 |
1998年 | 31篇 |
1997年 | 21篇 |
1996年 | 21篇 |
1995年 | 24篇 |
1994年 | 23篇 |
1993年 | 17篇 |
1992年 | 16篇 |
1991年 | 6篇 |
1990年 | 9篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 4篇 |
排序方式: 共有1089条查询结果,搜索用时 578 毫秒
601.
离子浮选法处理电镀废水实验研究 总被引:1,自引:0,他引:1
进行离子浮选法处理电镀废水的研究,对影响因素pH、CA∶CMe(摩尔比)、离子强度、浮选时间和通气量等进行了实验研究。实验结果表明:离子分离选择性递减顺序为:Cd2+Zn2+Fe2+Cu2+Ni2+。当CA∶CMe为2.5~3∶1,pH为8.5~9,离子强度不高于0.0001 mol/L时,离子浮选对镉、锌、铜、镍等金属离子均有很高的去除率,Cd2+、Zn2+、Fe2+、Ni2+、Cu2+残余浓度最低分别可达0.05、0.20、0.22、0.28和0.33 mg/L,处理后的电镀废水各污染物浓度均达到排放标准。泡沫产品中镉、锌、铜、镍品位分别达到3.2%、9.3%、18.1%和13.2%,具有极高的资源回收价值。 相似文献
602.
主要对面包酵母菌在Zn2+和Zn2+-Pb2+两种离子体系中Zn2+的吸附行为进行了探讨。选择灭活面包酵母菌为吸附剂,对pH、菌体加入量等吸附影响因素进行了探讨并进行了吸附动力学过程和等温吸附效果的研究。结果表明,不同离子体系中相同初始浓度情况下,动力学研究显示实验所用面包酵母菌对溶液中Zn2+而言是一种快速高效的生物吸附剂,且在整个吸附过程中存在:qt(Pb2+)qt(Zn2+-Pb2+)qt(Zn2+)。实验条件下,以单离子体系中的Zn2+、Pb2+和双离子体系中的总离子为研究对象时,都能很好符合Langmuir等温吸附模型,计算获得面包酵母菌对不同离子体系的最大吸附量大小顺序为:qmax(Zn2+-Pb2+)qmax(Zn2+)qmax(Pb2+);然而通过对动力学吸附过程、实际平衡吸附量qeqex、吸附能力参数KL和EDS测试结果的综合分析,认为面包酵母菌对各体系中离子的吸附能力大小顺序为:Pb2(单+)(Zn2+-Pb2+)Zn(2单+)。同时认为Pb2+的存在对面包酵母菌吸附Zn2+的行为过程具有强烈抑制作用。 相似文献
603.
代杰 《中国环境管理干部学院学报》2012,(5):1-3,7
我国环境侵权规范分散于相关立法,存在体系性不足和制度性缺陷等问题,因此,必须出台环境侵权专门立法。在构成要件方面,必须构建环境侵权二元规则,即人身损害适用无过错责任,财产损失适用过错推定责任;在责任承担方面,故意违法排污应当引入惩罚性赔偿。《侵权责任法》第67条适用于环境共同侵权内部责任份额的确定。环境侵权专门立法应当规定环境公益诉讼。 相似文献
604.
环境测试舱自吸附甲醛重释放规律与影响因素研究 总被引:2,自引:1,他引:1
广泛用于板材污染物释放量测试、空气净化产品净化效果测试等实验中的环境测试舱,往往由于其内壁黏附性杂质而对目标测试物产生不可忽视的自吸附作用,自吸附污染物将作为二次释放源出现重释放,研究目标测试物的自吸附消耗量及重释放规律,探索有效控制措施,有利于对环境测试舱实验应用及室内污染控制提出指导性实际意义。分别选取0.2%甲醛溶液、大芯板作为同一自制玻璃环境测试舱2期实验(I期、Ⅱ期)的不同甲醛释放源,通过近90 d追踪测试,经不同释放源、不同控制条件下舱内壁自吸附甲醛的多次重释放实验,结合非线性拟合分析方法,总结出舱内壁自吸附甲醛重释放甲醛浓度变化符合一阶递增指数函数:y=A1×exp(-x/t1)+y0,(A1<0、t1>0)。曲线参数y0值可用于评价实验条件下测试舱内自吸附甲醛残余量;y0值与环境舱舱体材质、环境温湿度、舱外甲醛浓度及空气交换手段有关,而与释放源及其释放平衡浓度高低无明显关系。大开舱门短时间抽气式空气交换对舱内自吸附甲醛残余有适度清除效果,使y0值降低,同时有利于再次平衡状态的快速建立;而长时间的无动力空气交换,或者自来水洗及去离子水洗等处理手段对舱内壁自吸附甲醛残余无明显清除作用。 相似文献
605.
606.
空气-乙炔间接火焰原子吸收法是我国目前运用较多且易于推广的铝检测方法,研究了Mg2+、Ca2+、Zn2+和Ni2+4种离子对此法测定0.40 mg/L Al3+的干扰情况。得出如下结论:(1)在±5%误差范围内,15.10 mg/L Mg2+、105.00mg/L Ca2+、0.23 mg/L Zn2+、0.88 mg/L Ni2+对0.40 mg/L Al3+无干扰。(2)本方法虽然操作复杂,但成本较低、灵敏度高,检测的浓度范围宽、稳定性好,加标回收率为96%~99%,检出限为0.04 mg/L,适宜测定范围为0.05~100.00 mg/L,适用于饮用水、河水及地下水中Al3+的测定。 相似文献
607.
Enhanced sorption of perfluorooctane sulfonate (PFOS) on carbon nanotube-filled electrospun nanofibrous membranes 总被引:1,自引:0,他引:1
Multi-walled carbon nanotube-filled electrospun nanofibrous membranes (MWCNT-ENFMs) were prepared by electrospinning. The addition of MWCNTs (0.5 wt.% vs. ENFMs) doubled the specific surface area and tensile strength of the ENFMs. The MWCNT-ENFMs were used to adsorb perfluorooctane sulfonate (PFOS) in aqueous solutions. The sorption kinetics results showed that the sorption rate of PFOS onto the MWCNT-ENFMs was much higher than the sorption rate of PFOS onto the pure ENFMs control, and the pseudo-second-order model (PSOM) described the sorption kinetics well. The sorption isotherms indicated that the sorption capacity of the MWCNT-ENFMs for PFOS (16.29 ± 0.26 μmol g−1) increased approximately 18 times, compared with the pure ENFMs (0.92 ± 0.06 μmol g−1). Moreover, the solution pH significantly affected the sorption efficiency and sorption mechanism. The MWCNT-ENFMs were negatively charged from pH 2.0–10.0, but the electrostatic repulsion between the MWCNT-ENFMs and PFOS was overcome by the hydrophobic interactions between PFOS and the MWCNTs or nanofibers. The strong hydrophobic interactions between PFOS and the MWCNTs played a dominant role in the sorption process. For the pure ENFMs, the electrostatic repulsion was conquered by the hydrophobic interactions between PFOS and the nanofibers at pH > 3.1. In addition to the hydrophobic interactions, an electrostatic attraction between PFOS and the pure ENFMs was involved in the sorption process at pH < 3.1. 相似文献
608.
Adsorption characteristics of Cu(II) from aqueous solution onto biochar derived from swine manure 总被引:2,自引:0,他引:2
Jun Meng Xiaoli Feng Zhongmin Dai Xingmei Liu Jianjun Wu Jianming Xu 《Environmental science and pollution research international》2014,21(11):7035-7046
The purpose of this study was to investigate adsorption characteristic of swine manure biochars pyrolyzed at 400 °C and 700 °C for the removal of Cu(II) ions from aqueous solutions. The biochars were characterized using BET surface area, Fourier transform infrared spectroscopy (FTIR), zeta potential, scanning electron microscopy/energy dispersive spectrometer (SEM–EDS), and X-ray diffraction (XRD). The adsorption of Cu(II) ions by batch method was carried out and the optimum conditions were investigated. The adsorption processes of these biochars are well described by a pseudo-second-order kinetic model, and the adsorption isotherm closely fitted the Sips model. Thermodynamic analysis suggested that the adsorption was endothermic. The maximum Cu(II) adsorption capacities of biochars derived from fresh and composted swine manure at 400 °C were 17.71 and 21.94 mg g?1, respectively, which were higher than those at 700 °C. XRD patterns indicated that the silicate and phosphate particles within the biochars served as adsorption sites for Cu(II). The removal of Cu(II) ions from industrial effluent indicated that the fresh swine manure biochar pyrolyzed at 400 °C can be considered as an effective adsorbent. 相似文献
609.
Evaluating the exchange of DDTs between sediment and water in a major lake in North China 总被引:1,自引:0,他引:1
Guo-Hua Dai Xin-Hui Liu Gang Liang Wen-Wen Gong 《Environmental science and pollution research international》2014,21(6):4516-4526
A large-scale sampling program was conducted to simultaneously collect surface water, overlying water, pore water, and sediment samples at monthly intervals between March and December 2010 from Baiyangdian Lake, North China to assess the distribution of DDTs and determine the net direction of sediment–water exchange. Total DDT concentrations ranged 2.36–22.4 ng/L, 0.72–21.9 ng/L, 2.25–33.7 ng/L, and 4.42–7.29 ng/g in surface water, overlying water, pore water, and sediments, respectively, which were at the intermediate levels compared to those of other area around the world. Seasonal variations of DDTs were featured by higher concentration in summer. This was likely associated with (a) the increase of land runoff in the summer and (b) application of dicofol and DDT-containing antifouling paints for ships in summer. Sediment–water fugacity ratios of the DDT isomers were used to predict the direction of the sediment–water exchange of these isomers. The sediment–surface water, sediment–overlying water, and sediment–pore water fugacity ratios of DDT isomers averaged 0.34, 0.44, and 0.1, which are significantly lower than the equilibrium status (1.0), suggesting that the net flux direction were from the water to sediment and the sediment acted as a sink for the DDTs. The difference of DDT concentrations between sediment and water samples was found to be an important factor affecting the diffusion of DDT from the water to sediment. 相似文献
610.
Zhi F. Xu Ge Wen Dai Z. Kuang Fu X. Zhang Si P. Tang 《Journal of environmental science and health. Part. B》2013,48(5):336-343
A deltamethrin-imprinted polymer (MIP1) was prepared using bis(-6-O-butanediacid monoester)-β-cyclodextrin (BBA-β-CD) as the functional monomer and toluene 2,4-diisocyanate (TDI) as the cross-linker. In comparison to the molecularly imprinted polymer where β-CD was applied as the functional monomer (MIP2), MIP1 showed a higher specific binding capacity (ΔCP) and an improved imprinting factor (IF) for deltamethrin. The selective recognition experiments demonstrated that compared to MIP2, MIP1 could better recognize its template over other substrates that had similar chemical structures. The solid phase extraction (SPE) of deltamethrin using MIP1 as the adsorbent was further investigated. The recoveries of the molecularly imprinted solid phase extraction (MISPE) column for deltamethrin were 83.2–93.4% with relative standard deviations (RSD) of 2.03–6.19%. The method has been successfully applied to the enrichment of trace deltamethrin from real water samples. 相似文献