全文获取类型
收费全文 | 1241篇 |
免费 | 63篇 |
国内免费 | 198篇 |
专业分类
安全科学 | 38篇 |
废物处理 | 53篇 |
环保管理 | 57篇 |
综合类 | 518篇 |
基础理论 | 211篇 |
污染及防治 | 202篇 |
评价与监测 | 420篇 |
社会与环境 | 3篇 |
出版年
2024年 | 11篇 |
2023年 | 13篇 |
2022年 | 19篇 |
2021年 | 13篇 |
2020年 | 30篇 |
2019年 | 28篇 |
2018年 | 23篇 |
2017年 | 41篇 |
2016年 | 53篇 |
2015年 | 61篇 |
2014年 | 87篇 |
2013年 | 172篇 |
2012年 | 97篇 |
2011年 | 111篇 |
2010年 | 62篇 |
2009年 | 82篇 |
2008年 | 55篇 |
2007年 | 81篇 |
2006年 | 71篇 |
2005年 | 32篇 |
2004年 | 35篇 |
2003年 | 43篇 |
2002年 | 26篇 |
2001年 | 25篇 |
2000年 | 41篇 |
1999年 | 20篇 |
1998年 | 32篇 |
1997年 | 22篇 |
1996年 | 26篇 |
1995年 | 25篇 |
1994年 | 14篇 |
1993年 | 14篇 |
1992年 | 19篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1984年 | 1篇 |
排序方式: 共有1502条查询结果,搜索用时 15 毫秒
91.
采用固相萃取/高效液相色谱-三重四级杆质谱法同时测定医疗废水中的20种超痕量抗生素残留,通过优化试验条件,使方法在100μg/L~100μg/L范围内线性良好,方法检出限为024ng/L~122ng/L。空白水样和实际水样3个质量浓度水平的加标回收率分别为80.2%~108%和75.8%~114%,6次测定结果的RSD分别为2.4%~8.4%和1.7%~8.1%。将该方法用于测定重庆市2家三甲医院医疗废水中的超痕量抗生素残留,结果有11种抗生素检出,其余均为未检出。 相似文献
92.
The octanol–air partition coefficients (KOA) for PBB15, PBB26, PBB31, PBB49, PBB103 and PBB153 were determined as a function of temperature using a gas chromatographic retention time technique with 1,1,1-trichloro-2,2-bis (4-chlorophenyl) ethane (p,p′-DDT) as a reference substance. The internal energies of phase change from octanol to air (ΔOAU) were calculated for the six compounds and were in the range from 74 to 116 kJ mol−1. Simple regression equations of log KOA versus relative retention times (RRTs) on gas chromatography (GC), and log KOA versus molecular connectivity indexes (MCI) were obtained, for which the correlation coefficients (r2) were greater than 0.985 at 283.15 K and 298.15 K. Thus the KOA values of the remaining PBBs can be predicted by using their RRTs and MCI according to these relationships. 相似文献
93.
Gergely Vodila Mihály Molnár Mihály Veres Éva Svingor István Futó István Barnabás Sándor Kapitány 《Journal of environmental radioactivity》2009
Püspökszilágy Radioactive Waste Treatment and Disposal Facility (RWTDF) is a typical near-surface engineered repository designated to store low- and intermediate-level wastes from various institutes, research facilities and hospitals in Hungary. Two automatic combined 14C–tritium sampling units installed at the facility sample the air 2 m above surface. The one installed near the vaults detects tritium (T) activities two orders of magnitude higher than the far reference sampling unit. To localize the T emissions, 19 small absorption vapour samplers filled with silica gel were settled onto the ground surface. After the saturation of the silica gel, the water was recovered and its T concentration was measured with a low-background liquid scintillation counter. The absorption vapour samplers are cheap, simple and easy-to-use. We present the samplers and the T distribution map constructed from the data, which helps to localize the T emission. 相似文献
94.
Syam S. Andra Rupali Datta Sumathi K.M. Saminathan Stephan B.H. Bach 《Environmental pollution (Barking, Essex : 1987)》2009,157(7):2173-2183
Ethylenediamene tetraacetic acid (EDTA) has been used to mobilize soil lead (Pb) and enhance plant uptake for phytoremediation. Chelant bound Pb is considered less toxic compared to free Pb ions and hence might induce less stress on plants. Characterization of possible Pb complexes with phytochelatins (PCn, metal-binding peptides) and EDTA in plant tissues will enhance our understanding of Pb tolerance mechanisms. In a previous study, we showed that vetiver grass (Vetiveria zizanioides L.) can accumulate up to 19,800 and 3350 mg Pb kg−1 dry weight in root and shoot tissues, respectively; in a hydroponics set-up. Following the basic incubation study, a greenhouse experiment was conducted to elucidate the efficiency of vetiver grass (with or without EDTA) in remediating Pb-contaminated soils from actual residential sites where Pb-based paints were used. The levels of total thiols, PCn, and catalase (an antioxidant enzyme) were measured in vetiver root and shoot following chelant-assisted phytostabilization. In the presence of 15 mM kg −1 EDTA, vetiver accumulated 4460 and 480 mg Pb kg−1 dry root and shoot tissue, respectively; that are 15- and 24-fold higher compared to those in untreated controls. Despite higher Pb concentrations in the plant tissues, the amount of total thiols and catalase activity in EDTA treated vetiver tissues was comparable to chelant unamended controls, indicating lowered Pb toxicity by chelation with EDTA. The identification of glutathione (referred as PC1) (m/z 308.2), along with chelated complexes like Pb-EDTA (m/z 498.8) and PC1-Pb-EDTA (m/z 805.3) in vetiver root tissue using electrospray tandem mass spectrometry (ES-MS) highlights the possible role of such species towards Pb tolerance in vetiver grass. 相似文献
95.
A method for quality screening is suggested to detect volatile impurities in inorganic coagulants that are used for drinking water treatment. Static headspace gas chromatography with mass spectrometry detection (HS–GCMS) is sensitive and selective to detect volatiles in low concentrations. This study has discovered that volatile organic impurities are detectable in ferric and aluminium-based coagulants which are used for drinking water treatment. For ferric chloride, 2-propanol was detected at a level of 17–24 μg ml−1, acetone at 0.7–1.7 μg ml−1, 1,1,1-trichloroacetone at 0.02–0.04 μg ml−1, trichloromethane at 0.01–0.02 μg ml−1 and toluene at 0.01–0.12 μg ml−1. For ferric chloride sulfate, acetone was detected at a level of 0.12 μg ml−1, 1,1,1-trichloroacetone at 0.06–0.08 μg ml−1, trichloromethane at 0.13–0.23 μg ml−1, bromodichloromethane at 0.04–0.06 μg ml−1 and dibromochloromethane at 0.04–0.05 μg ml−1. For aluminium hydroxide chloride, only trichloromethane was detectable, but below the method detection limits (MDL). Although the concentrations of these impurities in commercial coagulants are low, this observation is important and should have impact on water industries for them to pay attention to the chemicals they are using for drinking water production. 相似文献
96.
作者把气相色谱仪(GC)与自行研制的光离子化检测器(PID)联用,实现了大气中痕量烃类化合物的直接测定,给出了仪器的构成和性能指标及测量结果. 相似文献
97.
采用离子色谱法同时测定白云石中高含量钙镁,该法与目前使用的络合滴定法相比,具有准确可靠、操作简便快速、无干扰等特点。对样品测定取得了满意的结果,氧化钙与镁瓣含量分别为31.99%和21.47%,相对标准偏差分别为0.81%和0.65%,平均回收率分别99.9%和102%。 相似文献
98.
99.
研究了大气中低分子量酮类化合物的气相色谱测定方法 ,进行了线性范围、精密度和准确度实验。结果表明 ,该方法具有简便快捷、准确灵敏的特点 ,适合于大气污染事故应急监测 相似文献
100.
串联四极杆质谱(GC-QqQ-MS/MS)测定土壤中的有机氯农药和多氯联苯 总被引:6,自引:1,他引:5
建立了用加速溶剂萃取仪(ASE)萃取、凝胶渗透色谱(GPC)净化、气相色谱/串联四极杆质谱多反应监测、同时测定土壤中17种有机氯农药和19种多氯联苯的方法.加标浓度在3.3μg/kg时的平均回收率在79.6%~93.2%之间,相对标准偏差在2.9%~13.0%之间,定量限在0.01~0.51μg/kg之间.在检测土壤样品中的有机氯农药和多氯联苯残留方面,Gc-QqQ-MS/MS相对于气相色谱/电子捕获检测器(GC-ECD)和GC-MS的选择离子检测(SIM)模式具有非常明显的优势,尤其是在低浓度水平的定性和定量方面. 相似文献