全文获取类型
收费全文 | 589篇 |
免费 | 4篇 |
国内免费 | 77篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 1篇 |
环保管理 | 70篇 |
综合类 | 174篇 |
基础理论 | 89篇 |
污染及防治 | 221篇 |
评价与监测 | 84篇 |
社会与环境 | 27篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 4篇 |
2022年 | 13篇 |
2021年 | 4篇 |
2020年 | 10篇 |
2019年 | 10篇 |
2018年 | 9篇 |
2017年 | 15篇 |
2016年 | 23篇 |
2015年 | 14篇 |
2014年 | 18篇 |
2013年 | 65篇 |
2012年 | 31篇 |
2011年 | 84篇 |
2010年 | 34篇 |
2009年 | 54篇 |
2008年 | 61篇 |
2007年 | 37篇 |
2006年 | 34篇 |
2005年 | 14篇 |
2004年 | 17篇 |
2003年 | 17篇 |
2002年 | 14篇 |
2001年 | 14篇 |
2000年 | 12篇 |
1999年 | 6篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1988年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1973年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有670条查询结果,搜索用时 375 毫秒
661.
662.
苏州河沉积物中的硅藻及其污染指示作用 总被引:6,自引:0,他引:6
阐述了苏州河的北新泾处状沉积物中的硅藻丰度、种类及其数量的变化,优势种属的相对含量的变化。整段沉积物中上、中、下层硅藻的丰度、种类相对很少,苏州河一期污水截流工程建成后,水质有所改善,有利于藻类生长和繁殖,沉积下来的硅藻也增多。结果表明,该柱状沉积物中的硅藻变化能有效地反映苏州河的污染变迁趋势;苏州河的水质污染以前极其严重,近年来有所改善,其主要污染类型为有机污染。 相似文献
663.
东海特定海区柱状沉积物中磷的存在形态及其环境指示意义 总被引:5,自引:0,他引:5
对国家海洋二所1998年5月调查过程中采自长江口外特定海区的柱状沉积物样品进行了系统的总磷及各形态磷分析。邻近长江口,杭州湾的MESO站位,总磷(TP)、铁结合态磷(Fe-P)和有机磷(OP)增色高于其它站位,表明来自长江、钱塘江水系的污染物已对东海海域的环境造成了一定影响。在垂直方向上,各站位TP、OP和Fe-P的含量自下而上增高,此外,Fe-P和OP由于还原溶解与生物降解等作用,倾向于进入孔隙水,参与海洋磷的再循环。吸附态磷(Ad-P)与钙结合态磷(Ca-P)的含量向上递减,与成岩期自生磷灰石的沉淀,以及磷的吸附-解吸附再平衡有关。 相似文献
664.
大气汞在土壤中转化及其与土壤汞富集的相关性 总被引:18,自引:0,他引:18
通过现场调查与模拟试验相结合的方法,研究了大气汞对土壤汞富集的影响及其进入土壤后的形态转化。 相似文献
665.
666.
Heavy metal pollution status in surface sediments of Swan Lake lagoon and Rongcheng Bay in the northern Yellow Sea 总被引:1,自引:0,他引:1
The national ‘Shandong Peninsula Blue Economic Zone Development Plan’ compels the further understanding of the distribution and potential risk of metals pollution in the east coast of China, where the rapid economic and urban development have been taken off and metal pollution has become a noticeable problem. Surface sediments collected from the largest swan habitat in Asia, the Swan Lake lagoon and the surrounding coastal area in Rongcheng Bay in northern Yellow Sea, were analyzed for the total metal concentrations and chemical phase partitioning of five heavy metals (Cu, Zn, Pb, Cd, and Cr). Metal contents in the studied region have increased significantly in the past decade. The speciation analyzed by the sequential extraction showed that Zn and Cr were present dominantly in the residual fraction and thus of low bioavailability, while Cd, Pb and Cu were found mostly in the non-residual fraction thus of high potential availability, indicating significant anthropogenic sources. Among the five metals, Cd is the most outstanding pollutant and presents high risk, and half of the surface sediments in the studied region had a 21% probability of toxicity based on the mean Effect Range-Median Quotient. At some stations with comparable total metal contents, remarkably different non-residual fraction portions were determined, pointing out that site-specific risk assessment integrating speciation is crucial for better management practices of coastal sediments. 相似文献
667.
Cheng S 《Environmental science and pollution research international》2003,10(4):256-264
GOAL, SCOPE AND BACKGROUND: As one of the consequences of heavy metal pollution in soil, water and air, plants are contaminated by heavy metals in some parts of China. To understand the effects of heavy metals upon plants and the resistance mechanisms, would make it possible to use plants for cleaning and remediating heavy metal-polluted sites. METHODS: The research results on the effects of heavy metals on plants and resistant mechanisms are compiled from Chinese publications from scientific journals and university journals, mostly published during the last decade. RESULTS AND DISCUSSION: Effects of heavy metals on plants result in growth inhibition, structure damage, a decline of physiological and biochemical activities as well as of the function of plants. The effects and bioavailability of heavy metals depend on many factors, such as environmental conditions, pH, species of element, organic substances of the media and fertilization, plant species. But, there are also studies on plant resistance mechanisms to protect plants against the toxic effects of heavy metals such as combining heavy metals by proteins and expressing of detoxifying enzyme and nucleic acid, these mechanisms are integrated to protect the plants against injury by heavy metals. CONCLUSIONS: There are two aspects on the interaction of plants and heavy metals. On one hand, heavy metals show negative effects on plants. On the other hand, plants have their own resistance mechanisms against toxic effects and for detoxifying heavy metal pollution. RECOMMENDATIONS AND OUTLOOK: To study the effects of heavy metals on plants and mechanisms of resistance, one must select crop cultivars and/or plants for removing heavy metals from soil and water. More highly resistant plants can be selected especially for a remediation of the pollution site. The molecular mechanisms of resistance of plants to heavy metals should be studied further to develop the actual resistance of these plants to heavy metals. Understanding the bioavailability of heavy metals is advantageous for plant cultivation and phytoremediation. Decrease in the bioavailability to farmlands would reduce the accumulation of heavy metals in food. Alternatively, one could increase the bioavailability of plants to extract more heavy metals. 相似文献
668.
采用顺序提取的方法对南京市典型河流和湖泊水域的沉积物进行重金属化学形态研究,分析了Cu、Zn、Pb、Cd、Ni、Cr 6种重金属元素在不同水体沉积物中各个形态赋存的含量分布特征。结果表明,6种元素生物有效性排序为:Cd PbZn Cu Ni Cr,其中Cd和Pb以弱酸提取态和可还原态为主要存在形态,其不仅会对上覆水体产生二次污染,对水生动植物也具有较强的危害性。另外,通过结果间接反映出受人类生产生活影响大的水体,受污染的程度更高,各种金属元素赋存的形态也更易迁移转化,在环境治理方面更应受到重视。 相似文献
669.
异丙醇增感电感耦合等离子体质谱法直接测定土壤和沉积物中硒 总被引:3,自引:0,他引:3
提出了沸水浴混合酸法消解,以异丙醇为增感剂,电感耦合等离子体质谱直接测定土壤和沉积物中硒的方法。实验表明2mol/L硝酸-4mol/L盐酸混酸能有效溶出土壤和沉积物中各种形态的硒。相对于1%硝酸基体,4%(V/V)异丙醇基体中硒的ICP-MS响应值提高了12.1倍;而且4%(V/V)异丙醇基体可有效抑制硒的质谱干扰。ICP发射功率和雾化气流速是影响异丙醇在ICP-MS测定过程增敏效应的主要因素。以78硒为测定同位素,方法检出限为0.005mg/kg,实际样品测定精密度均小于5%。用于测定土壤和沉积物国家标准样品并对其消解液进行加标回收实验,结果令人满意。 相似文献
670.