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91.
对2,4-二硝基苯肼吸附衍生-高效液相色谱(DNPH-HPLC)法和罐采样/气相色谱-质谱(GC-MS)法的测定条件进行优化,将两种方法测定环境空气中13种醛酮类化合物(OVOCs)的结果做比对分析。结果表明,HPLC法和GC-MS法均可实现一次进样13种OVOCs全分析,方法检出限分别为0.26μg/m3~1.39μg/m3和0.49μg/m3~1.10μg/m3,加标回收率分别为95.9%~111%和52.0%~138%。两种方法测定实际样品,检出组分的测定结果无显著性差异;HPLC法适合测定环境空气中低碳类(C1~C3)低浓度OVOCs,GC-MS法适合测定多碳类(C4~C8)低浓度OVOCs。 相似文献
92.
93.
甲基橙分光光度法测定环境空气及工业废气中游离溴 总被引:8,自引:0,他引:8
以0.005‰甲基橙溶液富集吸收,用分光光度法测定环境空气和工业废气中的游离溴,并对样品的采集、保存和最佳测定条件进行了研究。结果表明,方法的采样效率〉97%,线性良好,精密度和准确度均较高,方法灵敏,按20L采样体积计,方法的最低检出浓度为0.025mg/m^3。 相似文献
94.
泰山顶与济南市大气臭氧浓度变化规律研究 总被引:1,自引:1,他引:0
利用2003年7月至9月在泰山顶和济南市3个月的臭氧(O3)自动连续监测数据,对两地O3浓度的频率分布、日变化和日际变化等特征进行对照分析。实验结果表明,泰山顶O3小时平均浓度频率分布比较集中,济南市O3小时平均浓度频率分布比较分散。泰山顶各月O3小时平均浓度的平均值和日均值均高于济南市;泰山顶O3小时平均浓度的最大值低于济南市,而O3小时平均浓度的最小值要高于济南市。泰山顶O3小时平均浓度日变化规律与济南市O3小时平均浓度日变化规律有很大差别,泰山顶O3小时平均浓度日变化很平缓,最大值与最小值相差不大,济南市O3小时平均浓度一般在中午和午后浓度较高,早晨和夜晚较低。 相似文献
95.
An optimized approach for estimating benzene in ambient air within an air quality monitoring network
Benzene is a carcinogenic air pollutant for which European legislation has set an annual limit and criteria for the number of fixed monitoring sites within air quality networks(AQMN). However, due to the limited number of fixed sites for benzene measurement, exposure data are lacking. Considering the relationship between benzene levels and other variables monitored within an AQMN, such as NO2, O3, temperature, solar radiation, and accumulated precipitation, this study propo... 相似文献
96.
97.
Ambient concentrations of PM2.5 and PM10 are of concern with respect to effects on human health and environment. Increased levels of mortality and morbidity have been associated with respirable particulate air pollution. In India, it is not yet mandatory to monitor PM2.5 levels therefore very limited information is available on PM2.5 levels. To understand the fine particle pollution and also correlate with PM10 which are monitored regularly in compliance with ambient air quality standards. This study was carried out to monitor PM2.5, PM10, and NO2 for about one year in a residential cum commercial area of Mumbai city with a view to understand their correlation. The average PM2.5 concentration at ambient and Kerbsite was 43 and 69 μg/m3. The correlation coefficients between PM2.5 and PM10 at ambient and Kerbsite were 0.83 and 0.85 respectively thus indicating that most of the PM2.5 and PM10 are from similar sources. TSP, PM10 levels exceeded Central Pollution Control Board(CPCB) standard during winter season. PM2.5 levels also exceeded 24 hourly average USEPA standard during winter season indicating unhealthy air quality. 相似文献
98.
An Index to Measure Depreciation in Air Quality in Some Coal Mining Areas of Korba Industrial Belt of Chhattisgarh, India 总被引:1,自引:0,他引:1
Singh G 《Environmental monitoring and assessment》2006,122(1-3):309-317
The comparison with National Ambient Air Quality Standards does not always depict a true pic-ture of the Air Quality Status of a study area. As an alternative an index that measures depreciation in Air Quality on more realistic terms has been proposed and
applied to the ambient air monitoring data collected from some areas of Korba Coalfields in India. Results have been discussed in detail to illustrate the applica-tion of the proposed index and utility in bringing out more realistic air quality assessment. 相似文献
99.
100.
Measurements of carbonyls and C2–C6 non-methane hydrocarbons (NMHCs) were made in ambient air at a rural site at the summit of Whiteface Mountain (WFM) in New York State. Alkanes dominated in the samples, with ethane and propane making up about 55% of the total on a carbon-atom basis. Ethane, the longest-lived of the NMHCs, showed a mixing ratio in the range of 0.86–2.1 ppbv. Photochemical ageing analysis indicated an anthropogenic influence on the NMHC levels. The photochemical reactivity of the hydrocarbons, calculated in terms of propylene-equivalent concentration, was dominated by alkenes (propene and ethene), which accounted for 74% of the total NMHC sum. Air mass back-trajectories have been used to investigate the origin of the observed NMHCs and carbonyls. Higher concentrations were found when air masses arrived from the midwestern US corridor. Acetone was the most abundant species, comprising from 31% to 53% of the total detected carbonyls, followed by MEK (15–53%), HCHO (7–39%), and CH3CHO (7–19%). Average concentrations were determined to be 1.61 ppbv for CH3C(O)CH3, 1.40 ppbv for MEK, 1.16 ppbv for HCHO, and 0.49 ppbv for CH3CHO. The variations in carbonyl concentrations were observed to follow patterns similar to variations in O3 concentrations, typical of secondary products. Correlations and statistical analysis of the carbonyls and NMHCs were performed, and showed that most of the compounds derived from mixing and photochemical transformation of long-range transported pollutants from the major source areas. Ranking of the carbonyls with respect to removal of the OH radical showed HCHO to be the most important species, followed by CH3CHO, MEK, and CH3C(O)CH3. 相似文献