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121.
通过对水中氮的内循环及氮支出的叙述,分析了屠宰废水经SBR法处理后氨氮升高的原因,并提出了改进措施。 相似文献
122.
S.M.A.D. Zayed I.Y. Mostafa Madiha M. Parghaly H.S.H. Attaby Yousr M. Adam Pathia M. Mahdy 《Journal of environmental science and health. Part. B》2013,48(2):253-267
Abstract 3H‐Trifluralin was synthesized by condensation of 3H‐4‐chloro‐3,5‐dinitro‐α, α, α‐trifluorotoluene with di‐n‐propylamine. After incubation of trifluralin with Aspergillus carneus, Fusarium oxysporum and Trichoderma viride for 10 days, a small percentage (less than 10%) of unchanged herbicide was recovered in the extractable fraction. This indicates a fairly rapid degradation of the herbicide by the fungal species. Other than trifluralin, the culture medium contained at least five labelled products: 2, 6‐dinitro‐N‐n‐propyl‐α, α, α‐tri‐fluoro‐p‐toluidine; 2, 6‐dinitro‐α, α, α‐trifluoro‐p‐toluidine; 2‐amino‐6‐nitro‐α, α,‐trifluoro‐p‐toluidine, 2, 6‐dinitro‐4‐trifluoromethyl phenol and a major polar product which constituted more than 50% of the total extractable transformation products. A pathway, which similates that of aerobic degradation of the herbicide in soil, is suggested for the microbiological degradation of trifluralin. 相似文献
123.
For decades, toxaphene had been used as a major chloropesticide. Degradation of the multicomponent mixture in the environment was mainly reported to be due to anaerobic dechlorination and hydrodechlorination. Little was known about oxidative transformation processes and the potential hydroxylated metabolites were not available as standard compounds. For this reason we synthesized hydroxylated polychlorobornanes by the UV-induced photochlorination of 2-endo-bornyl acetate with sulfuryl chloride followed by hydrolysis of the acetate moiety. The released polychlorinated 2-endo-hydroxybornanes were slightly higher chlorinated the longer the reaction was maintained. After 8 h, the main products were pentachlorinated hydroxybornanes followed by hexa- and heptachlorinated homologues. Traces of octachlorinated hydroxybornanes were also observed. The GC/ECNI-MS spectra of the products were characterized by the molecular ions and the [M-Cl]− fragment ions. The molecular ions of the polychlorinated hydroxybornanes are isobaric with those of polychlorinated biphenyls. E.g. hexachlorohydroxybornanes (C10H12Cl6O) and hexachlorobiphenyls (C12H4Cl6) show the molecular ion at m/z 358. Based on fractionation experiments on silica with the synthesis products it might be possible that OH-CTTs if present in samples will elute into a more polar fraction usually discarded or not collected. Both problems might explain why these compounds have not been more frequently described in the scientific literature. 相似文献
124.
A. H. El‐Sebae M. H. Salem M. R. S. El‐Assar E. E. Enan 《Journal of environmental science and health. Part. B》2013,48(5):439-451
Abstract The present study was carried out to investigate the effect of Curacron (profenofos), Sumicidin (fenvalerate) and Dimilin (di‐fluobenzuron) on the in vitro rate of protein and RNA synthesis by rabbit liver and muscle tissues. The synthesis of protein and RNA were significantly stimulated in the liver and inhibited in the muscle by graded doses of these insecticides. Profenofos showed maximum effect on protein synthesis in both tissues at a dose of 0.2 μg/mL, while the maximum effect on RNA synthesis occurred at 0.2 μg/mL in the liver and at 2 μg/mL in the muscle. Fenvalerate caused maximum stimulation in both liver protein and RNA synthesis at a dose of 2 μg/mL, and maximum inhibition in the muscle at 10 and 0.2 μg/mL for protein and RNA synthesis respectively. The maximum effect of Dimilin on both tissues was reached at 5 μg/mL for protein synthesis and at 0.2 μg/mL for RNA synthesis. The effect of Dimilin on RNA synthesis was more pronounced in both tissues than its effect on protein synthesis, but this trend was reversed in the case of profenofos and fenvalerate. Present data also showed antagonism between these insecticides on the rate of protein and RNA synthesis. 相似文献
125.
Yuxin Lu Xiang Li Cagnetta Giovanni Bo Wang 《Frontiers of Environmental Science & Engineering》2023,17(7):89
126.
电器实验室在对电器产品实施安全性能检测的过程中,实验室本身存在着安全和环境污染问题。如何对实验室的日电器实验室在对电器产品实施安全性能检测的过程中,实验室本身存在着安全和环境污染问题。如何对实验室的日常运作进行安全和环境的有效监控,对于保护实验室仪器设备和生命财产安全,以及试验人员的健康,具有重要的意义。
电器实验室安全和环境问题涉及但不限于防火、防烫伤、防暴、防触电、防机械伤害、防淋水、防盗、限制区域的禁入、仪器设备的保护、试验负荷控制、环境温度、湿度、电网电压、谐波畸变、噪音、有毒有害气体、电磁渡污染等诸多方面。本文针对电器实验室存在的一些主要安全和环境问题,从经济和技术可行性方面研究有效解决方法,并提出一种利用现代科技实现远程综合监控的方案。 相似文献
127.
面对严峻的大气污染防治形势,国务院《大气污染防治行动计划》(简称国家"大气十条")明确了到2017年大气污染防治的阶段性目标。在借鉴国外有关空气质量达标管理经验的基础上,提出组织实施"大气十条",需要以空气质量持续改善为目标,围绕空气质量达标管理这条主线,完善配套的政策、法规、标准、技术以及评估、考核等一系列方法和制度体系。 相似文献
128.
探究林业生态保护与天然林保护的具体措施 总被引:1,自引:0,他引:1
在我国长期的发展与建设过程中,林业生态保护与天然林保护在很长的一段时期内被忽视,部分地区的环保设施与政策严重影响了当地甚至是全国的林业生态环境状况。 相似文献
129.
中国是一个电子电器生产大国,广东又是国内家电等电子电嚣产品生产和出口的大省,是全球最大的制造基地和出口基地之一.随着家电等电子电器产品的无铅化要求,我国电子电器生产商将面临严峻的考验.本文对此进行了分析,提出了应对措施. 相似文献
130.