全文获取类型
收费全文 | 157篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 8篇 |
环保管理 | 39篇 |
综合类 | 24篇 |
基础理论 | 26篇 |
污染及防治 | 49篇 |
评价与监测 | 7篇 |
社会与环境 | 4篇 |
出版年
2023年 | 2篇 |
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 2篇 |
2013年 | 18篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 9篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 4篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 12篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 6篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 1篇 |
1978年 | 2篇 |
1972年 | 1篇 |
1971年 | 5篇 |
排序方式: 共有160条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
A. H. Fensom P. F. Benson M. J. Crees Marie Ellis C. H. Rodeck R. W. Vaughan 《黑龙江环境通报》1983,3(2):127-130
Homocystinuria due to cystathionine β-synthase deficiency was excluded in a fetus at 23 weeks' gestation by demonstrating activity of the enzyme in fetal lymphocytes after stimulation by phytohaemagglutinin. Fetal blood sampling was carried out because two determinations of enzyme activity on cultured amniotic cells gave low, not fully diagnostic values. 相似文献
106.
Spurgeon DJ Lawlor A Hooper HL Wadsworth R Svendsen C Thomas LD Ellis JK Bundy JG Keun HC Jarup L 《Environmental pollution (Barking, Essex : 1987)》2011,159(12):3425-3432
The relationship of measured or modelled Cd concentrations in soil, house dust and available to plants with human urinary Cd concentrations were assessed in a population living around a Cd/Pb/Zn smelter in the UK. Modelled air concentrations explained 35% of soil Cd variation indicating the smelter contributed to soil Cd loads. Multi-variate analysis confirmed a significant role of biological and life-style factors in determining urinary Cd levels. Significant correlations of urinary Cd with soil, house dust and modelled plant available Cd concentrations were not, however, found. Potential reasons for the absence of clear relationships include limited environmental contact in urban populations; the role of undefined factors in determining exposure; and the limited spatial scope of the survey which did not sample from the full pollution gradient. Further, the absence of any significant relationship indicates that environmental measures provide limited advantage over atmospheric model outputs for first stage human exposure assessment. 相似文献
107.
Xianjun Xie Thomas M. Johnson Yanxin Wang Craig C. Lundstrom Andre Ellis Xiangli Wang Mengyu Duan 《Chemosphere》2013,90(6):1878-1884
Iron isotope compositions of various Fe pools in aquifer sediments were measured at a known As-contaminated site in the Datong Basin, China. The δ56Fe values of HCl-extracted poor-crystalline Fe(III) range widely from ?0.41‰ to 0.36‰. We interpret the low Fe(II)/FeExtractable ratios (<50%) and the negative correlation between Fe(II)/FeExtractable and δ56Fe values in HCl-extracted poor-crystalline Fe to be best explained by redox cycling of Fe induced by microbial Fe(III) reduction. However, the high Fe(II)/FeExtractable ratios (?70%) and positive correlation between Fe(II)/FeExtractable and δ56Fe values for HCl-extracted poor-crystalline Fe indicates production of sulfides (FeSs). The δ56Fe values of crystalline Fe(III) extracted by reductant appears to be comparatively small varying from ?0.01‰ to 0.24‰, which is consistent with the δ56Fe values for ferric oxides/hydroxides having undergone microbial Fe(III) reduction. The Fe isotope composition of various Fe pools shows the transformation between crystalline Fe(III) and poor-crystalline crystalline Fe(III) and the secondary Fe(II) phases has already occurred or is occurring in aquifer sediments. More importantly, there is a significant difference in the As concentrations in crystalline Fe(III) oxides/hydroxides and HCl-extracted Fe phases. The concentrations of As range from 1.6 to 29.9 mg kg?1 and from 0.6 to 3.0 mg kg?1, for crystalline Fe(III) and HCl-extracted Fe phases respectively. Accordingly, the transformation of Fe minerals induced by microbial Fe(III) reduction can contribute to the mobilization of As. This study is the first to examine the Fe isotope compositions in high As aquifer sediments; the results show that the Fe isotope would be an important tool in demonstrating the enrichment of As in groundwater. 相似文献
108.
J. C. Lorimor L. N. Mielke L. F. Elliott J. R. Ellis 《Journal of the American Water Resources Association》1972,8(5):999-1005
ABSTRACT. A study of nitrate concentration in the groundwater beneath a beef cattle feedlot near Central City, Nebraska was started in 1968. An intensive 3-day pumping study was conducted at the feedlot at the start of 1970 irrigation system. Little nitrate concentration was found in the ground-water coming from beneath the feedlot. Pumping caused a slight increase in nitrate concentration over the average concentration for the previous 2 years. 相似文献
109.
Key methodological aspects are presented for a study of concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), and organochlorine pesticides in the serum of a sample of the New Zealand population aged 15 years and older. The study took advantage of the sampling frame and sample collection and interview processes of the National Nutrition Study (NNS). An additional blood sample for this organochlorines study was collected by the NNS and questions added to the NNS questionnaire. Serum was obtained from the blood and, based on responses to questions in the questionnaire, samples with possible occupational exposure to organochlorines were excluded. Remaining samples providing at least 2 ml of serum were pooled within 80 strata defined according to geographic area, age group, sex and ethnicity. A minimum number of five individual serum samples was required for pooling within a stratum. Within strata with sufficient samples, two or three pooled samples were created for variance calculation. Eligible for inclusion in the study were 2497 individual serum samples. Sixty strata had sufficient serum samples for pooling and chemical analysis. This was the first study of organochlorine compounds with a national population-based sample. Two factors that made the study feasible deserve emphasis. First, being able to "piggy-back" on another study. Second, pooling of samples to reduce analytic expenses. It is hoped that the methods used in this study will form the basis for other studies investigating organochlorine concentrations in national populations. 相似文献
110.
Previous workers have shown that selenium is only partially trapped on a filter during air sampling. In some cases, these losses have been attributed to volatilization of selenium dioxide. Our results demonstrate that selenium dioxide, in the presence of moist air, is completely recovered (apparently as selenious acid aerosols) and that the previous shortfalls must be due to other selenium species as yet unidentified. Selenious acid aerosols in our study were formed by volatilizing selenium dioxide (approximately 3 mg) into a stream of moist ambient air (relative humidity, greater than 50%), and trapped on glass fiber filters using a high-volume air sampler. Selenium(IV) was ultrasonically extracted from the filter with water and analyzed by atomic absorption spectrometry. Selenious acid aerosols were trapped on the filters with high efficiency (105 +/- 5 percent) using a 50 minute sampling period. With an extended sampling period (24 hours) the recovery was 103 +/- 6 percent. 相似文献