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971.
972.
山东省生态环境承载力评价指标体系探讨 总被引:3,自引:0,他引:3
将生态环境承载力划分为资源承载力、环境承载力、循环经济水平和经济社会支持能力四部分,结合山东省生态环境现状,根据指标体系建立的原则,选用了57项评价指标,分层次构建了山东省生态环境承载力评价指标体系.其中,资源承载力选用生物资源、水资源等5大类共10项指标;环境承载力选用地表水、近岸海域等5大类共9项指标;循环经济水平选用资源产出水平、资源消耗水平等4大类共18项指标;经济社会支持能力选用人口数量与素质水平、经济发展水平等7大类共20项指标. 相似文献
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975.
汽车尾气中多环芳烃(PAHs)成分谱图研究 总被引:26,自引:9,他引:26
采集并测定了不同型号、油品、里程数的汽车尾气中14种多环芳烃,对分析结果归一化处理后确定其多环芳烃成分谱图.研究表明,汽车在30rmin内排放的14种PAHs总浓度为41.53~121.1μg/m3;其中苯并(a)蒽(BaA)浓度最大,占总量的33.3%;萘(Naph)、苯并(ghi) (Bghip)、茚(1,2,3-cd)芘(In)分别为16.8%、12.9%和12.1%.相同里程数的柴油车排放PAHs总量大于汽油车;除BaA和Naph,柴油车主要排放苊(Ac)、芴(Fluor)、Bghip和In,而汽油车主要排放Bghip、In、苯并(k)荧蒽(BkF).柴油车排放3环PAHs的量大于汽油车,但5~6环PAHs的排放量小于汽油车;随着汽车里程数的增加,PAHs(特别是荧蒽(Flur)、芘(Py)、苯并(a)芘(BaP)、Bghip)的排放总量增加. 相似文献
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977.
Fangzhou Li Jiangshan Zhou Chun Du Wei Li Yinzhen Wang Guannan He Qinyu He 《环境科学学报(英文版)》2017,29(10):24-32
A one-step microwave irradiation method was used to deposit carbon and nitrogen co-doped TiO_2((C, N)-TiO_2) on commercial brick((C, N)-TiO_2/brick). The as-prepared samples were characterized by X-ray diffraction, ultraviolet–visible(UV–vis) diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy(SEM). A selective technique was also used to investigate the concentration of hydroxyl radicals during UV–vis irradiation of the Methyl Orange solution with the as-prepared samples. The C and N dopants enhanced visible light absorption and provided a longer lifetime for the photo-generated electron–hole pairs. The SEM images showed that the as-prepared sample is porous. The dark adsorption and photodegradation test for(C, N)-TiO_2/brick showed good photodegradation and good recyclability. The best photodegradation rate was 94% after 2 hr. The maximum degradation rate was maintained even after the 6th cycle. The good photocatalytic properties are attributed to the enhanced visible light absorption, enhanced pollutant adsorption arising from the porous structure of the(C, N)-TiO_2 thin film, and longer lifetime of the photo-generated electron–hole pairs.(C, N)-TiO_2/brick should have potential commercial applications in photodegradation processes because of its low cost, good photodegradation, and excellent recyclability. 相似文献
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979.
Methyl tert-butyl ether(MTBE), as a widely used gasoline additive, is suspected of being environmentally toxic. MTBE accumulates mainly in adipose tissue, but its effect on obesity or obesity-related metabolic disorders has not been well understood yet. Therefore, we examined the effect of MTBE on the adipose function and the related metabolic processes with both 3T3-L1 cell line and C57 BL/6 J mice model. We found that exposure to MTBE at the environmental relevant concentration(100 μmol/L) could significantly induce differentiation of preadipocyte and disturb insulin-stimulated glucose uptake of mature adipocyte.The in vivo observation in male mice showed a positive correlation of visceral white adipose tissue(vWAT) expansion and cell size increase with MTBE treatment in 14 weeks. Glucose tolerance and insulin sensitivity tests demonstrated that MTBE at 1000 μg/(kg·day)disturbed the systemic glucose metabolism in a gender-specific manner, which might be partly attributed to the alterations of gut microbiota community at genus level with respect to Akkermansia, Clostridium XlVb, and Megamonas. In summary, our study characterized the effect of MTBE on adipose tissue function and glucose homeostasis in vitro and in vivo, and revealed that systemic disorders of the glucose metabolism might be modulated by the related gut microbiota. 相似文献
980.