全文获取类型
收费全文 | 1112篇 |
免费 | 124篇 |
国内免费 | 544篇 |
专业分类
安全科学 | 92篇 |
废物处理 | 54篇 |
环保管理 | 122篇 |
综合类 | 875篇 |
基础理论 | 245篇 |
污染及防治 | 233篇 |
评价与监测 | 136篇 |
社会与环境 | 19篇 |
灾害及防治 | 4篇 |
出版年
2024年 | 3篇 |
2023年 | 28篇 |
2022年 | 35篇 |
2021年 | 46篇 |
2020年 | 47篇 |
2019年 | 69篇 |
2018年 | 43篇 |
2017年 | 56篇 |
2016年 | 69篇 |
2015年 | 71篇 |
2014年 | 70篇 |
2013年 | 109篇 |
2012年 | 123篇 |
2011年 | 117篇 |
2010年 | 96篇 |
2009年 | 105篇 |
2008年 | 83篇 |
2007年 | 96篇 |
2006年 | 87篇 |
2005年 | 71篇 |
2004年 | 54篇 |
2003年 | 57篇 |
2002年 | 30篇 |
2001年 | 45篇 |
2000年 | 41篇 |
1999年 | 31篇 |
1998年 | 17篇 |
1997年 | 20篇 |
1996年 | 18篇 |
1995年 | 10篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1991年 | 8篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1985年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有1780条查询结果,搜索用时 281 毫秒
951.
非甲烷总烃在监测过程中,废气样品保存容器的选择和保存时间的长短对分析结果有重要影响。研究结果表明:使用玻璃注射器保存样品,应在8 h内完成分析;使用泰德拉惰性气袋保存样品,保存时间可延长至48 h,如废气中主要组分为沸点高于150℃的高沸点化合物,则应在8 h内完成非甲烷总烃的测定。 相似文献
952.
GC-MS/MS法测定石油污染土壤中的多环芳烃 总被引:1,自引:0,他引:1
采用丙酮-正己烷混合溶液(体积比为1∶1)提取石油污染土壤样品中10种典型多环芳烃,用GC-MS/MS法测定。通过优化前处理和测定条件,使方法在0.100 mg/L~10.0 mg/L范围内线性良好,方法检出限为5.00μg/kg~15.8μg/kg。土壤样品加标回收试验6次测定结果的RSD为0.1%~16.6%,加标回收率为43.1%~109%。将该方法用于测定湖南某石化项目周边的实际土壤,结果表明该地区不同点位土壤中多环芳烃测定值为未检出~300μg/kg,在国家标准规定的范围内。 相似文献
953.
954.
研究了陕北主要石油勘探开发地区地表水的水质状况,分析了pH、矿化度(全盐量)、硬度、六价铬、砷、镉、铅、氨氮、挥发酚、石油类、化学需氧量(COD)、氯化物、硫酸盐、硝酸盐氮、总磷、氰化物、氟化物等17个指标,结果显示砷、镉、铅、氟化物、硝酸盐、氰化物、氟化物的Pi值均小于1;挥发酚、总磷、石油类、氨氮、COD、六价铬、硫酸盐、矿化度、氯化物、硬度均超标。研究区东部和西部地表水呈现出不同的污染特征,通过分析不同区域污染物来源,提出了污染防治对策与建议。 相似文献
955.
研究了基于生产排放全过程、多相、多类污染物并举的污染源识别特征成分谱建立技术。首先建立污染源排放完整图谱,包括原辅料、中间物质、产品、各工艺废水污染物、水处理设施进口和出口污染物等。然后从排放完整图谱中解析出特征污染物。对于废水中的常规污染物和金属污染物,采用与受纳水体浓度相比较的方式得到污染源识别特征污染物,建议将浓度超过受纳水体1倍的污染物定为特征污染物。对于有机污染物,将质量分数之和大于90%的污染物集定为特征有机污染物,并按照有机物类别进行分类。最后开发建立动态的水污染源排放数据库。应用该技术建立了石化行业典型企业的排放特征成分谱,发现这些特征组分具有很好的代表性,为水污染源的识别提供了基础数据。 相似文献
956.
天津城郊土壤中PAHs含量特征及来源解析 总被引:4,自引:1,他引:3
以天津市郊环城四区为研究对象,系统采集了环城四区95个表层土壤样品,利用高效液相色谱仪对16种PAHs进行分析测定,结果表明,西青、东丽、津南和北辰土壤中16种PAHs的总量范围分别为62.6~1 994.9、36.1~4 074.7、20.1~2 502.5、22.1~707.7μg/kg;平均含量分别为445.8、841.8、509.5、242.5μg/kg。四区中都以高环多环芳烃为主,西青、东丽、北辰和津南高环多环芳烃分别占多环芳烃总比例的45.4%、42.2%、38.8%和38.7%。空间分析的结果表明,靠近天津市市区样点土壤中多环芳烃的含量要明显高于远离市区土壤中多环芳烃的含量。利用环数PAHs的相对丰度和比值法对天津市郊环城四区土壤中多环芳烃的污染来源进行了解析,研究区土壤监测样点的PAHs主要来自燃烧源,少部分来自石油类来源或几种污染源的共同复合累加的作用。 相似文献
957.
Wayland M Headley JV Peru KM Crosley R Brownlee BG 《Environmental monitoring and assessment》2008,136(1-3):167-182
An immense volume of tailings and tailings water is accumulating in tailings ponds located on mine leases in the oil sands
area of Alberta, Canada. Oil sands mining companies have proposed to use tailings- and tailings water-amended lakes and wetlands
as part of their mine remediation plans. Polycyclic aromatic hydrocarbons (PAHs) are substances of concern in oil sands tailings
and tailings water. In this study, we determined concentrations of PAHs in sediments, insect larvae and adult insects collected
in or adjacent to three groups of wetlands: experimental wetlands to which tailings or tailings water had been purposely added,
oil sands wetlands that were located on the mine leases but which had not been experimentally manipulated and reference wetlands
located near the mine leases. Alkylated PAHs dominated the PAH profile in all types of samples in the three categories of
wetlands. Median and maximum PAH concentrations, especially alkylated PAH concentrations, tended to be higher in sediments
and insect larvae in experimental wetlands than in the other types of wetlands. Such was not the case for adult insects, which
contained higher than expected levels of PAHs in the three types of ponds. Overlap in PAH concentrations in larvae among pond
types suggests that any increase in PAH levels resulting from the addition of tailings and tailings water to wetlands would
be modest. Biota-sediment accumulation factors were higher for alkylated PAHs than for their parent counterparts and were
lower in experimental wetlands than in oil sands and reference wetlands. Research is needed to examine factors that affect
the bioavailability of PAHs in oil sands tailings- or tailings water-amended wetlands. 相似文献
958.
959.
The population counts of hydrocarbon-utilising yeasts weremonitored at six sampling stations in the Benin City municipalarea over a four-week period. Although the population countswere relatively constant in each locality, the highest countsoccurred in areas heavily polluted by domestic and industrialeffluents. A total of thirty-five hydrocarbon-degrading yeastswere isolated from soil at the sampling stations usingn-hexadecane as sole carbon source. The isolates were identifiedas belonging to the genera Candida (27 strains), Endomycopsis (4 strains). All the organisms grew on long-chainn-alkane, kerosene, diesel oil and crude oil but failed to growon short-chain n-alkane, aromatic and alicyclic hydrocarbons.Measurement of growth attributes of the isolates usingn-hexadecane, diesel oil and crude oil as substrates showed thatthe Candida species were better utilizers of hydrocarbonsubstrates relative to Endomycopsis and Schizosaccharomyces species. 相似文献
960.
Effects of an Oil Spill on Soil Physico-Chemical Properties of a Spill Site in a Typic Udipsamment of the Niger Delta Basin of Nigeria 总被引:2,自引:0,他引:2
Physico-chemical analysis of soil samples at an oil spill site in a Typic Udipsamment of the Niger Delta Basin of Nigeria showed that the total hydrocarbon content of top soil layers ranged from 18.6 to 23.6 ppm in the heavy impact zone and the oil had penetrated to a depth op 8.4 m. The concentration of hydrocarbons in the medium impact zone ranged from 10.04 to 10.38 ppm while hydrocarbons were not detected in 85% of samples from the unimpacted reference zone. Heavy metal concentration measurements in the soil revealed a significant build-up (P < 0.05) of lead, copper and zinc in the heavy impact zone. Other quality parameters including electrical conductity, exchangeable cations, total nitrogen and available phosphorus in impacted soils were relatively low, while the total organic carbon was high compared with the reference site. Textural class of soil from the different depths showed a predominantly brown sand at the topsoil, loamy sand and grey coarse sand at medium depths, and grey coarse sand and greyish sandy clay at greater depths. 相似文献