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761.
MnO2-loaded D301 weak basic anion exchange resin has been used as adsorbent to simultaneously remove lead and cadmium
ions from aqueous solution. The e ects of adsorbent dosage, solution pH and the coexistent ions on the adsorption were investigated.
Experimental results showed that with the adsorbent dosage more than 0.6 g/L, both Pb2+ and Cd2+ were simultaneously removed at
pH range 5–6. Except for HPO4
2??, the high concentration coexistent ions such as Na+, K+, Cl??, NO3??, SO4
2?? and HCO3??, showed no
significant e ect on the removal e ciency of both Pb2+ and Cd2+ under the experimental conditions. The coexistence of Mg2+, Ca2+
caused the reduction of Cd2+ removal, but not for Pb2+. The adsorption equilibrium for Pb2+ and Cd2+ could be excellently described
by the Langmuir isotherm model with R2 > 0.99. The maximum adsorption capacity was calculated as 80.64 mg/g for Pb2+ and 21.45
mg/g for Cd2+. The adsorption processes followed the pseudo first-order kinetics model. MnO2-loaded D301 resin has been shown to
have a potential to be used as an e ective adsorbent for simultaneous removal of lead and cadmium ions from aqueous solution. 相似文献
762.
763.
石灰与磷肥对籽粒苋吸收镉的影响 总被引:9,自引:0,他引:9
籽粒苋(Amaranthus hypochondriacus L.)是我国广泛栽种的牧草,但具有富集重金属Cd的特性,探讨减少其吸收镉的方法技术,可以降低人畜受害风险.研究利用温室盆栽方法,比较了施用磷肥和石灰对降低籽粒苋Cd吸收量的影响.于含镉5 mg·kg-1的污染菜园土中,以粉末形式加入3 g·kg-1 Ca(OH)2,或以液态形式加入磷肥(0.326 g·kg-1 Ca(H2PO4)2)至P浓度80 mg·kg-1,该施用量为农业应用常规水平.播种籽粒苋,于60 d后收获,测定相关参数.结果表明,施用石灰使土壤pH上升1.7单位,土壤有效Cd下降至极低水平,从而大幅降低籽粒苋Cd吸收量,较对照下降约56%,但施石灰也使土壤供磷量下降,使籽粒苋的生物量也减少了约一半.施用石灰后,土壤的Ca与K供应量以及籽粒苋体内Ca与K含量均明显增加,Ca、K与Cd形成的竞争吸收也是施用石灰后籽粒苋Cd含量下降的一个原因.本地菜同土含有较高的有效磷,以常规农业磷肥施用量施用磷肥对籽粒苋吸收Cd没有明显影响,对生物量也没有明显影响,但适当提高施用量预期会有一定的效果.因而,对广州地区菜园土,使用合理的石灰施用量,可有效降低籽粒苋Cd吸收量. 相似文献
764.
我国南方主要酸沉降区土壤中铝的释放与缓冲作用 总被引:13,自引:0,他引:13
本文研究了我国南方酸沉降区主要土壤类型在模拟酸雨影响下淋溶液pH值及Al离子释放特点,结果表明,石灰土和滨海盐土的阳离子淋溶量低于阳离子交换量,土壤主要处于阳离子交换缓冲范围和碳酸盐-硅酸盐缓冲范围,Al释放量一般低于0.40mmol·kg^-1。 相似文献
765.
Di CUI Ang LI Tian QIU Rui CAI Changlong PANG Jihua WANG Jixian YANG Fang MA Nanqi REN 《Frontiers of Environmental Science & Engineering》2014,8(6):937-944
Bioaugmentation is an effective method of treating municipal wastewater with high ammonia concentration in sequencing batch reactors (SBRs) at low temperature (10℃). The cold-adapted ammonia- and nitrite- oxidizing bacteria were enriched and inoculated, respectively, in the bioaugmentation systems. In synthetic wastewater treatment systems, the average NH4+-N removal efficiency in the bioaugmented system (85%) was much higher than that in the unbioaugmented system. The effluent NH4+ -N concentration of the bioaugmented system was stably below 8 mg. L1 after 20 d operation. In municipal wastewater systems with bioaugmentation, the effluent NH4+- -N concentration was below 8 mg·L^-1 after 15 d operation. The average NH4+ -N removal efficiency in unbioaugmentation system (about 82%) was lower compared with that in the bioaugmentation system. By inoculating the cold-adapted nitrite-oxidizing bacteria (NOB) into the SBRs after 10 d operation, the nitrite concentration decreased rapidly, reducing the NO2 -N accumulation effectively at low temperature. The func- tional microorganisms were identified by PCR-DGGE, including uncultured Dechloromonas sp., uncultured Nitrospira sp., Clostridium sp. and uncultured Thauera sp. The results suggested that the cold-adapted microbial agent of ammonia-oxidizing bacteria (AOB) and NOB could accelerate the start-up and promote achieving the stable operation of the low-temperature SBRs for nitrification. 相似文献
766.
767.
零价铁对土壤中对氯硝基苯的还原作用 总被引:1,自引:0,他引:1
在常温常压下,利用零价铁(Fe0)还原土壤中的对氯硝基苯(p-CNB),研究反应产物随时间的变化以及反应条件对还原率的影响.实验结果表明,Fe0能够有效将土壤中的p-CNB还原成对氯苯胺(p-CAN),反应过程中先生成中间产物对氯亚硝基苯(p-CNSB),然后再进一步还原生成p-CAN.p-CNB还原率受到反应时间,土壤初始pH、温度、铁粉用量和土壤含水率等条件的影响.当p-CNB约为2.5×10-6mol/g,土壤初始pH为6.8,铁粉用量为50 mg,土壤含水率为75%时,在恒温生化培养箱中温度为(25±1)℃条件下,反应5 h后p-CNB还原率达到97.43%. 相似文献
768.
769.
Deng Fengxia Qiu Shan Zhu Yingshi Zhang Xiaoxiao Yang Jixian Ma Fang 《Environmental science and pollution research international》2019,26(12):11928-11939
Environmental Science and Pollution Research - The first application of a novel electro-Fenton (EF) for coking wastewater (CW) treatment at the original pH (6.80) by using tripolyphosphate (TPP)... 相似文献
770.
Chromosomal aberrations and DNA damage in human populations exposed to the processing of electronics waste 总被引:1,自引:0,他引:1
Qiang Liu Jia Cao Ke Qiu Li Xu Hong Miao Guang Li Fei Yue Fan Yong Cheng Zhao 《Environmental science and pollution research international》2009,16(3):329-338
Background, aim, and scope It has been known that the pollutants of electronic wastes (E-wastes) can lead to severe pollution to the environment. It
has been reported that about 50% to 80% of E-wastes from developed countries are exported to Asia and Africa. It has become
a major global environmental problem to deal with ‘E-wastes’. E-waste recycling has remained primitive in Jinghai, China.
This not only produces enormous environmental pollution but also can bring about toxic or genotoxic effects on the human body,
threatening the health of both current residents and future generations living in the local environment. The concentration
of lead in the blood of children in the E-waste polluted area in China is higher than that of the control area. But little
is known about the cytogenetic effect to human beings caused by the pollution of E-wastes. In the present study, experiments
have been performed to investigate the genetics of permanent residents of three villages with numerous E-waste disposal sites
and to analyze the harmful effects of exposure to E-wastes.
Materials and methods In total, 171 villagers (exposed group) were randomly selected from permanent residents of three villages located in Jinghai
County of Tianjin, China, where there has been massive disposal of E-wastes. Thirty villagers were selected from the neighboring
towns without E-waste disposal sites to serve as controls. Chromosomal aberrations and cytokinesis blocking micronucleus were
performed to detect the cytogenetic effect, dic + r (dicentric and ring chromosome), monomer, fragments (acentric fragments,
minute chromosomes, and acentric rings), translocation, satellite, quadriradial, total aberrations, and micronuclear rate
were scored for each subject. DNA damage was detected using comet assay; the DNA percentage in the comet tail (TDNA%), tail
moment (TM), and Olive tail moment (OTM) were recorded to describe DNA damage to lymphocytes.
Results The total chromosome aberration rates (5.50%) and micronuclear rates (16.99%) of the exposure group were significantly higher
than in the control group (P = 0.000). The percentage of DNA in the comet tail, tail moment, and Olive tail moment detected by comet assay showed that
there was a significant difference in DNA damage in the exposure group (P = 0.000). The chromosome aberration, micronucleus rate, and DNA damage observed in women were significantly higher than those
in men. Chromosome aberration and micronuclear rates of both smokers and non-smokers in the exposure group are obviously higher
than that in the control group (P = 0.000).
Discussion The use of outdated (and unsafe) ways to deal with E-wastes can lead to exposure to a variety of substances harmful to human
health. The components of pollution may enter the human body through the air, drinking water, and food chain to damage human
genetic material, resulting in genomic instability. The rates of chromosomal aberration, micronucleus formation, and the degree
of DNA damage in women in the group exposed to electronic waste were significantly higher than in men. The reason for this
may be concerned with the traditional lifestyle of the local residents or the difference of sensitivity to the exposure to
E-wastes or any others. Further investigations are needed to provide evidence to demonstrate this.
Conclusions Here, we report the obviously cytogenetic toxicity to the exposure population by the E-waste pollution for the first time.
E-waste pollution may be a potential agent of genetic mutation, and may induce cytogenetic damage within the general population
exposed to the pollution. These findings need to be considered, and steps should be taken to protect the current population
and future generations from the effects of pollution with E-wastes.
Recommendations and perspectives The above results remind us that the impact of E-waste recycling on environmental quality of Jinghai should be evaluated soon.
Moreover, it is urgent for the government to prohibit E-waste import and its processing by outdated ways. The future studies
such as pollutant details of drinking water, air, and soil in the area as well as epidemiological investigations on the harmful
effect to children must be performed eagerly. All the data available do provide a compelling case for immediate action in
both countries to address workplace health and safety and waste management.
Qiang Liu and Jia Cao contributed equally to this study and share the first authorship. 相似文献