全文获取类型
收费全文 | 82篇 |
免费 | 7篇 |
国内免费 | 48篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 1篇 |
环保管理 | 1篇 |
综合类 | 69篇 |
基础理论 | 38篇 |
污染及防治 | 20篇 |
评价与监测 | 4篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 2篇 |
2019年 | 2篇 |
2018年 | 8篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 9篇 |
2014年 | 3篇 |
2013年 | 22篇 |
2012年 | 12篇 |
2011年 | 9篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 3篇 |
2007年 | 11篇 |
2006年 | 10篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1990年 | 1篇 |
1986年 | 1篇 |
排序方式: 共有137条查询结果,搜索用时 281 毫秒
1.
Tributyltin(TBT), an organometal used as an antifouling biocide, has been reported to induce masculinization of fish. Benzo [a]pyrene (BaP), a widespread carcinogenic polycyclic aromatic hydrocarbon, has been reported that its microsomal metabolites can produce an estrogenic response when tested in vitro. This study was therefore designed to examine the potential in vivo influence of TBT, BaP and their mixture on sex hormone levels in serum of Sebastiscus marmoratus, which were given 2 separate intraperitoneally (ip) injections(a single injection every 7 d) of TBT(0.5, 1, 5 and 10 mg/kg), BaP(0.5, 1, 5 and 10 mg/kg), or both in combination(0.5, 1, 5 and 10 mg/kg); control fish received olive oil vehicle only. Six days after the 2nd injection, serum samples were collected and analyzed for sex hormone levels and alkali labile protein phosphorus (ALPP), which is related to the yolk precursor protein vitellogenin. The pollutants at all doses significantly reduced serum testosterone, estradiol and ALPP content after 2 injections compared with the corresponding controls. The reduction of the estradiol levels should be response for the decrease of the vitellogenin levels. The results in the present study suggested that aromatase seems not the major target acted by TBT and BaP in fish. This study demonstrated that TBT or BaP exposure both inhibit the reproductive potential in female Sebastiscus marmoratus. Combined effect of TBT and BaP on the serum testosterone, estradiol and ALPP was not antagonism from the anticipation. 相似文献
2.
The peroxynitrite/porphyrin biomimetic system was established to investigate the effects of peroxynitrite on benzo[a]pyrene (B[a]P) metabolism. Three model systems consisting of different iron porphyrins were compared, and the results showed that the peroxynitrite/T(p-Cl)PPFeCl system was the highest catalytic efficiency in the metabolism of B[a]P. We analyzed the B[a]P metabolites produced from this system by RP-HPLC method and firstly identified the formation of nitrobenzo[a]pyrenes which are the special metabolites of B[a]P induced by peroxynitrite. 相似文献
3.
4.
在微波无极灯下将烯氧基瓜环固载到巯基硅胶(MSG)上,制得固载化瓜环(ACB[6]-SG).通过红外光谱表征固载产物,并研究固载化瓜环对磺胺间甲氧嘧啶(SMM)的吸附性能.结果表明,SMM在固载化瓜环上的吸附基本在2 min内即可达到平衡;Henry方程和Freundlich方程均能较好地拟合SMM在固载化瓜环和巯基硅胶上的等温吸附曲线,但是SMM在固载化瓜环上的吸附主要是在瓜环中的分配,而SMM在巯基硅胶上的吸附则主要是多分子层的表面吸附作用;SMM在固载化瓜环上的平衡吸附量远大于在巯基硅胶上的平衡吸附量;SMM在两者上的吸附过程是一个放热过程,温度越低吸附效果越好. 相似文献
5.
土壤中多环芳烃的SPMD辅助解吸行为研究 总被引:2,自引:0,他引:2
为了开发一种表征土壤中憎水性有机污染物解吸及生物有效性的新方法,建立了半透膜被动采样装置(SPMD)研究土壤中有机污染物解吸行为的方法,利用SPMD分析了多环芳烃菲、芘和苯并[a]芘在3种不同性质土壤中的辅助解吸行为.结果表明,SPMD是一种很好地表征土壤中憎水性有机污染物解吸及生物有效性的手段. SPMD辅助解吸多环芳烃的效率与土壤有机质及多环芳烃性质有关.随着土壤有机质含量的降低,土壤中菲和芘的SPMD解吸率逐渐升高,对于10 mg/kg染毒水平,当土壤有机质含量由18.68%降低到0.3%时,2种化合物的解吸率分别由56.45%和48.28%上升到接近100%;但是对于苯并[a]芘,粘土表现出明显的滞留能力,在有机质含量(0.3%)很低、粘土含量(39.05%)较高的3号土壤中,苯并[a]芘的解吸率仅有66.97%.不同多环芳烃SPMD辅助解吸率差别很大,随着土壤有机质含量的降低,以及污染物浓度的提高,菲和芘的解吸差异逐渐缩小,而苯并[a]芘与上述2种多环芳烃的差异很大,主要是由于苯并[a]芘具有高度亲脂性,并且分子较大,造成其容易滞留在粘土的微孔及有机质的致密结构中. 相似文献
6.
WU Yu-qiong WANG Chong-gang WANG Yun ZHAO Yang CHEN Yi-xin ZUO Zheng-hong 《环境科学学报(英文版)》2007,19(9):1129-1135
It has been reported that there is an interaction between Benzo[a]pyrene (BaP), a widespread carcinogenic polycyclic aromatic hydrocarbon, and tributyltin (TBT), an organometal used as an antifouling biocide. This study was therefore designed to examine the potential in vivo influence of BaP, TBT and their mixture on splenic antioxidant defense systems of Sebastiscus marmoratus. The fish were exposed to water containing environmentally relevant concentrations of BaP, TBT and their mixture. Spleens were collected for biochemical analysis after exposure for 7, 25, 50 d and after recovery for 7, 20 d. Cotreatment with BaP and TBT for 7 d potentiated the induction of glutathione peroxidase (GPx) activity by BaP or TBT alone. The cotreatment for 25 and 50 d resulted in inhibition of GPx activity, which was similar to the effect of TBT. Splenic glutathione S-transferase (GST) activities were significantly elevated in S. marmoratus exposed to BaP starting from 7 d and remained high up to 25 d. However, no further activity change was found with prolonged exposure. Cotreatment of BaP and TBT primarily inhibited the GST activity, which was similar to the effect of TBT. Cotreatment with BaP and TBT for 25 or 50 d potentiated the depletion of GSH (glutathione) by BaP or TBT alone. MDA (malondialdehyde) contents in spleen of S. marmoratus were not significantly altered compared with the control during the test period. Spleen, as an immune organ, is sensitive to exposure of BaP or TBT. It should have an effective mechanism to counteract oxidative damage. Antioxidative defense systems in spleen of S. marmoratus should be considered as potential biomarkers. Short-term exposure of BaP or TBT could result in induction of antioxidant defense system. A significant decrease of these indices, such as GSH, GST, GPx might indicate more severe contamination. 相似文献
7.
8.
蚯蚓细胞色素P450酶系对土壤中芘或苯并[a]芘的响应 总被引:1,自引:0,他引:1
以赤子爱胜蚓(Eisenia fetida)为受试生物,通过人工污染草甸棕壤微宇宙试验方法,研究了暴露于不同环境浓度芘或苯并[a]芘(添加量分别为0.12、0.24、0.48、0.96 mg·kg~(-1))污染的土壤中14 d后,蚯蚓体内细胞色素P450(CYPs)酶系,如CYPs总量、CYP1A1及CYP2C9活性的变化.结果显示,芘或苯并[a]芘暴露导致蚯蚓CYPs总量、CYP1A1及CYP2C9活性的变化不同.其中,CYPs总量与CYP1A1活性对芘的响应趋势相似:试验3 d后,0.96 mg·kg~(-1)芘导致二者都显著高于对照水平;14 d后,都显著低于对照水平;CYP1A1活性对芘的响应更为敏感.CYPs总量与CYP2C9活性对苯并[a]芘的响应趋势相似:暴露初期,苯并[a]芘最高暴露剂量(0.96 mg·kg~(-1))导致二者都显著低于对照水平;试验结束后,苯并[a]芘最低暴露剂量(0.12 mg·kg~(-1))导致二者都显著高于对照水平,最高剂量暴露导致二者都显著低于对照水平,CYP2C9活性对苯并[a]芘的响应更为敏感.因此,推断CYPs亚酶对污染物的响应具有选择性且亚酶的响应敏感度高于CYPs总量.将CYPs总量与CYP1A1活性结合,或与CYP2C9活性结合分别诊断土壤芘污染或并[a]芘污染,较为准确有效. 相似文献
9.
KERSTIN DERZ BURKHARD SCHMIDT SUSANNE SCHWIENING INGOLF SCHUPHAN 《Journal of environmental science and health. Part. B》2013,48(5):471-484
The microbial degradation of 14C-pyrene and 14C-benzo[a]pyrene by a bacterial mixed culture was studied within a mixture of the PAHs phenanthrene, anthracene, pyrene, fluoranthene, and benzo[a]pyrene as sole carbon source in the different culture systems: (i) liquid medium, (ii) soil slurry (surface and grinding influence), and (iii) soil. The fate of these two labeled compounds was followed in these systems with an emphasis on mineralization to carbon dioxide, extractability, and adsorption to humic materials and formation of unextractable residual. Mineralization showed the most obvious differences: soil slurries achieved the best results both concerning the extent of mineralization and the time required. The highest extent of pyrene mineralization (54% within 21 days) was observed in soil slurries; in liquid media, pyrene mineralization was slower, but reached approximately the same extent (54% in 150 days); in soils, mineralization reached only 36% of added pyrene after 160 days. Benzo[a]pyrene was mineralized in a mixture of PAHs in soil slurries to an extent of 34% within 70 days, whereas mineralization in liquid medium and soil occurred in the range of 5% (70 days). Mineralization of benzo[a]pyrene in sand slurries was lower compared to soil slurries (19% in sand slurries vs. 32% in soil slurries within 50 days). 相似文献
10.
运用空气质量模型CMAQ模拟评估民用燃煤减排政策对京津冀大气中BaP污染状况的改进效果,模拟包括作为基准情景的2014年和低消减和高消减2个减排情景.模拟结果表明:基准情景下,京津冀BaP年均浓度为2.54ng/m3,超过国家空气质量标准(1ng/m3),呈现1月 > 4月 > 10月 > 7月的季节变化特点,反映出冬季供暖燃煤的影响;京津冀南部BaP浓度高于北部,推测原因是南部BaP排放量较高.1月削减民用燃煤排放量对降低该地区BaP浓度和沉降量效果最显著,低削减和高削减下,北京、保定、廊坊BaP浓度分别比基准情景降低30%和40%以上;4、7、10月削减民用燃煤排放量对该地区BaP浓度和沉降量的变化影响不大.京津冀民用燃煤联防联控能更加有效地降低该地区BaP浓度. 相似文献