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排序方式: 共有1400条查询结果,搜索用时 31 毫秒
761.
Yixiang Cai Zhiyong Yan Yingjuan Ou Boshang Peng Lihua Zhang Jihai Shao Yiqing Lin Jiachao Zhang 《环境科学学报(英文版)》2022,34(1):240-248
This research investigated the effects of ciprofloxacin(CIP)(0.5, 5, and 20 mg/L) on SBR systems under different carbon source conditions. Microbial community abundance and structure were determined by quantitative PCR and high-throughput sequencing, respectively.The biodegradation production of CIP and possible degradation mechanism were also studied. Results showed that CIP had adverse effects on the nutrient removal from wastewater.Compared with sodium acetate, glucose could be more effective... 相似文献
762.
水泥工业清洁生产与环境保护初探 总被引:2,自引:0,他引:2
水泥工业是个能耗高、污染物排放量大的重污染行业,其对环境的污染主要是粉尘污染。在水泥厂实施清洁生产的潜力很大,不仅可以降低能耗、物耗,减少污染物的排放,同时,由于加强了管理,有助于提高生产效率,提高产品质量,降低生产成本,增强市场竞争力,可产生明显的经济、环境和社会效益 相似文献
763.
浅析新疆平原水库的环境地质问题 总被引:1,自引:0,他引:1
文章从新疆平原水库的特点及其作用出发,阐明了平原水库较适宜新疆的自然地理和经济状况;同时也分析了平原水库存在的环境地质问题及其治理措施,并强调病险库治理的迫切性 相似文献
764.
水体中农药与氢氧基的反应活性及持久性的关系 总被引:1,自引:0,他引:1
在自然水体光化学反应中。.OH是一活跃的自由基,本文阐述了一种测定0膛药与.OH反应速率的方法及体系,测定了十种中国,美国水田常用农药与.OH的反应速率;在室内及中国,美国稻田条件下,测定了几种具代表性常用农药的降解速率,并与.OH反应速率进行比较。 相似文献
765.
石墨探针直接收集、石墨探针炉原子吸收法测定APM中痕量银 总被引:1,自引:0,他引:1
本文采用一定气孔性的石墨探针直接收集大气颗粒物(APM),然后用石墨探针炉原子吸收法直接测定收集在探针上的APM中痕量银。实验表明:峰面积吸光度与银的浓度在0—120ng·ml~(-1)范围内呈线性关系,银的特征量为6.75pg,检测限(3σ)为11.74pg,RSD(n=11)为3.92%,分析标准物质NBS1648(城市颗粒物),其回收率和RSD(n=5)分别为90.2—105.0%和6.0%,证明此法准确、灵敏、快速、简便。 相似文献
766.
The impacts of bisphenol A (BPA) on abalone (Haliotis diversicolor supertexta) embryonic development 总被引:1,自引:0,他引:1
The effects of bisphenol A (BPA) on abalone (Haliotis diversicolor supertexta) embryonic development were investigated by exposing the fertilized eggs to four different concentrations of BPA (0.05, 0.2, 2 and 10 μg mL−1). Toxicity endpoints including the embryo development parameters, the physiological features and the expression profile of several reference genes (prohormone convertase 1, PC1; cyclin B, CB; and cyclin-dependent kinase 1, CDK1) were assessed. The results showed that BPA could markedly reduce embryo hatchability, increase developmental malformation, and suppress the metamorphosis behavior of larvae. The possible toxicological mechanisms hidden behind of these effects (i.e. disturbing the embryogenesis) might result from three aspects: (1) BPA disturbance the cellular ionic homeostasis and osmoregulation of abalone embryos by changing the Na+-K+-ATPase and Ca2+-Mg2+-ATPase levels; (2) BPA induced oxidative damage of embryos by significantly alterating the peroxidase (POD) activities and the malondialdehyde (MDA) production; and (3) the RT-PCR analysis further demonstrated that BPA perturbed the cellular endocrine regulation and cell cycle progression by down-regulating the PC1 gene, as well as over-expressing the CB and CDK1 genes. This is the first comprehensive study on the developmental toxicity of BPA to the marine abalone at morphological, physiological and molecular levels. The results in this study also indicated that the embryo tests can contribute to the ecological risk assessment of the endocrine disruptors in marine environment. 相似文献
767.
Chen J Chen TB Gao D Lei M Zheng GD Liu HT Guo SL Cai L 《Waste management (New York, N.Y.)》2011,31(1):65-70
Hydrogen sulfide (H2S) production patterns and the influence of oxygen (O2) concentration were studied based on a well operated composting plant. A real-time, online multi-gas detection system was applied to monitor the concentrations of H2S and O2 in the pile during composting. The results indicate that H2S was mainly produced during the early stage of composting, especially during the first 40 h. Lack of available O2 was the main reason for H2S production. Maintaining the O2 concentration higher than 14% in the pile could reduce H2S production. This study suggests that shortening the interval between aeration or aerating continuously to maintain a high O2 concentration in the pile was an effective strategy for restraining H2S production in sewage sludge composting. 相似文献
768.
Cui N Zhang X Xie Q Wang S Chen J Huang L Qiao X Li X Cai X 《Environmental pollution (Barking, Essex : 1987)》2011,159(2):609-615
Transformation products usually differ in environmental behaviors and toxicological properties from the parent contaminants, and probably cause potential risks to the environment. Toxicity evolution of a labile preservative, bronopol, upon primary aquatic degradation processes was investigated. Bronopol rapidly hydrolyzed in natural waters, and primarily produced more stable 2-bromo-2-nitroethanol (BNE) and bromonitromethane (BNM). Light enhanced degradation of the targeted compounds with water site specific photoactivity. The bond order analysis theoretically revealed that the reversible retroaldol reactions were primary degradation routes for bronopol and BNE. Judging from toxicity assays and the relative pesticide toxicity index, these degradation products (i.e., BNE and BNM), more persistent and higher toxic than the parent, probably accumulated in natural waters and resulted in higher or prolonging adverse impacts. Therefore, these transformation products should be included into the assessment of ecological risks of non-persistent and low toxic chemicals such as the preservative bronopol. 相似文献
769.
770.
Waterbird Population Changes in the Wetlands at Chongming Dongtan in the Yangtze River Estuary,China 总被引:1,自引:0,他引:1
Zhijun Ma Yong Wang Xiaojing Gan Bo Li Yinting Cai Jiakuan Chen 《Environmental management》2009,43(6):1187-1200
We studied the changes in wetland habitats and waterbird communities between the 1980s and the 2000s at Chongming Dongtan,
a Ramsar site in the Yangtze River estuary, an ecologically important region. This region is an important stopover site for
shorebirds along the East Asian–Australasian flyway and is extensively used by waterfowl. A net loss of 11% of the wetland
area was estimated during study periods at Chongming Dongtan. The change was dependent on wetland types: while the area of
artificial habitats such as paddy fields and aquacultural ponds more than doubled, more than 65% of natural habitats including
sea bulrush (Scirpus mariqueter) and common reed (Phragmites australis) marshes were lost over the two decades. An exotic plant species introduced from North America, smooth cordgrass (Spartina alterniflora), occupied 30% of the vegetated intertidal zone by the 2000s. Although waterbird species richness did not change between
the 1980s (110) and the 2000s (111), 13 species found in 1980s were replaced by 14 newly recorded species. Moreover, there
were more species with declining trends (58) than with increasing trends (19). The population trends of species were affected
by residential status and habitat types. Transients, wintering migrants, and habitat specialists were more likely to show
declining trends compared to those breeding at Dongtan (including year-round and summer residents) and habitat generalists.
Furthermore, species associated mainly with natural wetlands were more likely to decline than those associated mainly with
artificial wetlands. These patterns suggest that the loss and change of wetland habitats at Chongming Dongtan adversely affected
local population dynamics and might have contributed to the global decline of some waterbird species. Because Chongming Dongtan
provides stopover and wintering habitats for many migratory waterbirds, protection and restoration of natural wetlands at
Chongming Dongtan are urgently needed. 相似文献