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901.
不同土壤重金属复合污染的有效态离子冲量表征 总被引:4,自引:0,他引:4
选择红壤、黄棕壤和潮土为对象,依据中国土壤环境质量二级和三级标准确定土壤重金属铜、锌、镉的污染浓度,通过生物盆裁试验研究在重金属Cu、Zn、Cd复合污染条件下牧草(黑麦草、紫花苜蓿)体内重金属含量和土壤中重金属有效态含量的相关性,结果表明,在3种不同性质的污染土壤上,牧草体内重金属的离子冲量与其对应土壤中重金属有效态的离子冲量之间均存在明显的相关性。校正土壤pH、牧草品种等因素后,土壤有效态离子冲量可以有效表征不同土壤-牧草系统的重金属复合污染。 相似文献
902.
beta-Carboline-3-carboxylic acid methylamide (FG 7142), an anxiogenic agent, has been detected in human urine. The urinary excretion level of FG 7142 in non-smokers was found to be 0.503 +/- 0.25 ng per day (mean +/- S.D., n=10), while that in smokers was found to be 2.418 +/- 0.384 ng per day (n=10). This suggests that humans are exposed to FG 7142 and that smokers are exposed to higher levels of FG 7142 than non-smokers. Considering the previous findings that FG 7142 is present in cigarette smoke, indoor and outdoor air and smoke condensate of tree leaves, humans may be exposed to FG 7142 via the airways and lungs, although we cannot exclude the possibility of exposure via foodstuffs. Results of animal experiments suggest that FG 7142 which enters the bloodstream is excreted into the urine via the kidneys within 24 h in an unchanged form. Therefore, monitoring the level of FG 7142 in urine may be useful for monitoring the exposure level of FG 7142. 相似文献
903.
904.
AA3自动分析仪测定地表水中的NO2-N、NO3-N+NO2-N、NH3-N、PO4^3- 总被引:9,自引:0,他引:9
使用Bran+Luebbe AutoAnalyzer 3自动分析仪,同时测定地表水中的NO2-N、NO3-N+NO2-N、NH3-N、PO4^3-4个项目,结果显示相对标准偏差均〈1%,回收率在92%~108%之间,检测限较低,且系统运行稳定,能够满足地表水监测的要求。 相似文献
905.
906.
本文所研究江段的有机污染物主要来自两岸工业排放的废水、生活污水、工业废弃物及生活垃圾。污染源主要位于右岸,上游右岸沉积物中有机污染物的总浓度高于左岸,下游两岸沉积物中有机污染物的总浓度趋于一致。两岸沉积物中污染物总浓度随距离的变化规律如下: 右岸:C=92.044S~(-0.3028) R=-0.962 左岸:C=9.231e~(-0.0058) R=0.946 在该江段沉积物中共检出51种有机污染物。其中致癌、可疑致癌、致突变化合物25种,占检出化合物的49%。淤泥质沉积物中有机污染物的存在量60.67吨,岸边滩及心滩土壤中存在量138.2吨。 相似文献
907.
Removal of arsenic(V) from aqueous solutions was evaluated with the following three different sorption materials: coal-based activated carbon 12 x 40 (activated carbon), iron(II) oxide (FeO)/activated carbon-H, and iron oxide. The apparent characteristics and physical chemistry performances of these adsorbents were investigated by X-ray diffraction, nitrogen adsorption, and scanning electronic microscope. Also, batch experiments for arsenic removal were performed, and the effects of pH value on arsenic(V) removal were studied. The results suggest that the main phases of the iron oxide surface are magnetite, maghemite, hematite, and goethite; fine and uniform iron oxide particles can cover activated carbon surfaces and affect the surface area or pore structures of activated carbon; adsorption kinetics obey a pseudo-first-order rate equation; and adsorption capacities of adsorbents are affected by the values of pH. The optimum value of pH for iron oxide lies in a narrow range between 4.0 and 5.5, and arsenic(V) removal by FeO/activated carbon-H is ideal and stable in the pH range 3 to 7, while activated carbon has the lowest adsorption capacity in the entire pH range. Also, the adsorption characteristics of FeO/activated carbon-H composites and virgin activated carbon match well the Langmuir adsorption model, while those of iron oxide fit well the Freundlich adsorption model. 相似文献
908.
909.
910.
Xiaodong Zou Zhemin Shen Tao Yuan Shan Yin Jingping Cai Liping Chen Wenhua Wang 《Atmospheric environment (Oxford, England : 1994)》2006,40(40):8068-8073
In this paper, a shifted power-law model, based on the wind profile model, had been supposed to simulate concentration gradient of nitrogen dioxide (NO2) with distance from a highway. Field experiments were performed for NO2 gradients from a highway in Shanghai by using passive samplers. The shifted power-law model was fitted well with experimental results of field experiments both in this study and in the literature. The results not only verified the validity of shifted power-law relationship between NO2 concentration and the distance from a highway, but also partially demonstrated that there were some significant similarities between wind profile and air pollutants concentration profile near highway. With known concentration of chosen reference point and appropriate value of the parameter k, the model could be practically applied for predicting the NO2 distributions near a highway. The methods of determining the parameter k were also discussed for further detailed studies. 相似文献