全文获取类型
收费全文 | 2463篇 |
免费 | 413篇 |
国内免费 | 1766篇 |
专业分类
安全科学 | 234篇 |
废物处理 | 254篇 |
环保管理 | 218篇 |
综合类 | 2486篇 |
基础理论 | 559篇 |
污染及防治 | 752篇 |
评价与监测 | 62篇 |
社会与环境 | 49篇 |
灾害及防治 | 28篇 |
出版年
2024年 | 9篇 |
2023年 | 44篇 |
2022年 | 95篇 |
2021年 | 138篇 |
2020年 | 114篇 |
2019年 | 145篇 |
2018年 | 136篇 |
2017年 | 159篇 |
2016年 | 187篇 |
2015年 | 250篇 |
2014年 | 226篇 |
2013年 | 444篇 |
2012年 | 415篇 |
2011年 | 306篇 |
2010年 | 241篇 |
2009年 | 264篇 |
2008年 | 160篇 |
2007年 | 220篇 |
2006年 | 223篇 |
2005年 | 126篇 |
2004年 | 107篇 |
2003年 | 110篇 |
2002年 | 82篇 |
2001年 | 74篇 |
2000年 | 56篇 |
1999年 | 53篇 |
1998年 | 47篇 |
1997年 | 39篇 |
1996年 | 42篇 |
1995年 | 22篇 |
1994年 | 17篇 |
1993年 | 22篇 |
1992年 | 17篇 |
1991年 | 10篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有4642条查询结果,搜索用时 31 毫秒
601.
采用静态条件,考察了超声波对活性炭上Zn2+吸附/脱附性能的影响.结果表明,有/无超声作用下,活性炭对Zn2+的吸附率均随Zn2+初始浓度的增加而减少,该吸附过程属于优惠吸附, Langmuir模型能更好描述该过程,超声的引入对活性炭吸附Zn2+有一定抑制作用.脱附研究发现,在蒸馏水介质中,Zn2+脱附率仅为2.11%,加入超声后Zn2+的脱附率提高至20.8%,添加NaOH后脱附率明显增加,有/无超声作用下的脱附率分别为40.1%和33.1%.动力学分析表明,Zn2+在活性炭上的吸附/脱附均符合2级反应动力学. 相似文献
602.
Removal of selenite [Se (IV)] from aqueous solution on to industrial solid ‘waste’ Fe(III)/Cr(III) hydroxide as adsorbent was investigated in the present article. Maximum adsorption was found to be at pH 4.0. Pretreated Fe(III)/Cr(III) hydroxide was found to be more efficient for the removal of selenite compared to untreated adsorbent. Langmuir and Freundlich isotherms have been studied. The Langmuir adsorption capacity (Q 0) of the pretreated and untreated adsorbents was found to be 15.63 and 6.04?mg?g?1, respectively. The adsorption process fit into the second-order kinetics. Thermodynamic parameters show that the adsorption process is spontaneous and endothermic in the temperature range 32 to 60°C. Coexisting anions vanadate and phosphate significantly affect the adsorption of selenite for both the pretreated and untreated adsorbents. Molybdate, thiocyanate, sulphate, nitrate and chloride do not significantly affect the removal of selenite for pretreated adsorbent. 相似文献
603.
On the utilization of agricultural by-product, charcoal from rice bran was produced. The adsorption characteristics of indigo carmine onto charcoals from rice bran were investigated by the batch method. The yield and surface area of charcoal were decreased and increased with increase of carbonization temperature, respectively. The removal ratio of indigo carmine was high with the charcoal carbonized at higher temperature. In the relationship between the amount of indigo carmine adsorbed and the square root of elapsed time, a good linearity was recognized. The kinetic constant of adsorption removal for indigo carmine was rapid in the charcoal carbonized at higher temperature. The adsorption characteristics for indigo carmine removal by charcoal from rice bran were dominated by the value of their surface area. 相似文献
604.
Bogusław Buszewski Tomasz Ligor Wojciech Filipiak Maria Teresa Vasconcelos Matevž Pompe Marjan Veber 《毒物与环境化学》2013,95(1):51-64
There is a dearth of data on the consumer product concentrations of iron, lead, and nickel for accurate comparison to be made. The levels of these elements were determined in 85 samples of six different classes of personal care products commonly used in Nigeria using atomic absorption spectrophotometry. The results of the analysis showed that the range of the mean concentrations of Fe was 0.485–1.108 ppm, Pb ND–0.163 ppm, and Ni ND-0.160 ppm. The analytical data have demonstrated that the selected consumer products are possible sources of iron, lead, and nickel exposure. Users can be exposed to these metals directly through dermal contact or inhalation. The regulations relating to cosmetic products give no limit values for heavy metals in cosmetic products, hence, it was difficult to establish if the values obtained in this study are safe or not. Prolonged use of soaps, creams, and detergent containing these elements may pose threat to human health and the environment. This could be responsible for various skin diseases such as allergic skin, follicular and pigmentary disorders, which are common among the users (exposed groups) of these products in Nigeria. A body of evidence has presented a rare example of systemic allergic dermatitis caused by topical application of a mercury-containing cosmetic to the upper lip of a 32-year-old Turkish patient. 相似文献
605.
Isolated Trichoderma atroviride from Cu-polluted river sediment at the Serdang Industrial Area was studied under in vitro conditions to understand the mechanisms that allowed the fungi to thrive in the Cu-polluted freshwater ecosystem. From this study, adsorption was recognized as the main mechanism of Cu tolerance with 50–85% adsorption during the in vitro experiment. The uptake capacity of the isolate in liquid medium ranged from 0.8 to 11.2 mg g?1 in the potato dextrose broth medium with increasing Cu concentrations from 25 to 300 mg L?1. It was found that 2.7–5.0% of Cu was lost due to washing. The high percentage of Cu adsorption and the high uptake capacity of Cu by T. atroviride suggest that it is a potential bioremediator of Cu. However, further studies are needed to confirm its practical use as a bioremediating agent for Cu under field conditions. 相似文献
606.
Batch equilibrium and soil thin layer chromatography (TLC) techniques were used to investigate the influence of different volume fractions of organic cosolvents (acetone and methanol) on the adsorption and movement of carbaryl in four different types of Indian soils. L-shaped isotherms were obtained for both the cosolvent–water mixtures at all f s values and were in close agreement with the Freundlich equation. Higher adsorption was observed on F.R.I. soil (FSL) followed by Alampur soil (ASL), Kalai soil (KL), and Bhoran soil (BSL) at all f s values for both the cosolvent systems as was anticipated from the K and K D values. The K and K D values also confirmed that carbaryl adsorption was higher in methanol–water mixture than acetone–water mixture and decreased with increasing f s values. The frontal R f values obtained from soil TLC studies were inversely proportional to the K and K D values for both the cosolvent systems. The higher K and K D values and lower R f values in methanol–water mixtures relative to acetone–water mixtures for all the soils indicated that acetone had a greater potential for ground water contamination compared to methanol. The adsorption data were used to evaluate the cosolvent theory for describing adsorption of carbaryl in acetone–water and methanol–water mixtures. The aqueous phase partition coefficients, K DW (mol g?1), normalized with respect to f oc for carbaryl was evaluated by extrapolating f s → 0. 相似文献
607.
Pollution of water bodies by trace metals is an established problem and several studies have been conducted to deal with it. South Africa is amongst those countries whose water systems are most affected as a result of intensive mining activities. This research was dedicated to the development of an insoluble chelating polymer for use as an adsorbent for abstraction of metal ions from mining and industrial wastewaters. Polyethylenimine (PEI), well known for its metal chelating potential, was cross-linked by epichlorohydrin (ECH) in order to convert it into a water-insoluble form for direct use as an adsorbent. The binding affinity of the cross-linked polyethylenimine (CPEI) to heavy metal ions was assessed as well as its ability to be regenerated for re-use. CPEI exhibited good complexation ability to metal ions with high affinity to Cr and most divalent metal ions. The observed order of complexation was: Cr?>?Zn>?Fe?>?Ni?>?Mn?>?Pb. On the other hand, it showed very poor ability to bind oxo-anions such as SeO3 2? and AsO2 ? which has been attributed to the unavailability of suitable functional groups to interact with these ions. 相似文献
608.
609.
A heteropolyacid Zr(IV) tungstate-based cation exchanger has been synthesized. An amorphous sample, prepared at pH 1.2 and having a Na+ ion exchange capacity of 0.92?meq?g?1, was selected for further studies. Its physicochemical properties were determined using Fourier transform infrared spectrometer, X-ray diffraction, thermogravimetric, and scanning electron studies. To understand the cation exchange behavior of the material, distribution coefficients (K d) for metal ions in various solvent systems were determined. Some important binary separations of metal ions, namely Mg2+–Bi3+, Cd2+–Bi3+, Fe3+–Bi3+, Th4+–Bi3+, and Fe3+–Zn2+, were achieved on such columns. The practical utility of these separations was demonstrated by separating Fe3+ and Zn2+ ions quantitatively in commercial pharmaceutical formulation. The cation exchanger has been successfully applied also for the treatment of industrial wastewater and a synthetic mixture. All the results suggests that Zr(IV) tungstate has excellent potential for the removal of metals from aqueous systems using packed columns of this material. 相似文献
610.
Laboratory studies were conducted to determine the adsorption/desorption equilibrium of carbofuran between four divergently textured soils and distilled water and an aqueous solution of 0.01?mol?L?1 β-cyclodextrin using a batch equilibrium technique. The determined adsorption isotherms for silt loam soils were of L-shaped, for sandy loam soil S-shaped, in agreement with a Freundlich isotherm. In the presence of β-cyclodextrin, the adsorption of carbofuran to the four soils was lower than with distilled water. Positive hysteresis was observed in all soils with distilled water, negative hysteresis when using a solution of β-cyclodextrin as desorbent. The results indicate the potential use of β-cyclodextrin for remediation of pesticide-contaminated soils. 相似文献