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排序方式: 共有94条查询结果,搜索用时 31 毫秒
1.
活性炭性质对其吸附水中硝基苯性能的影响 总被引:1,自引:0,他引:1
通过对活性炭进行HNO3氧化及热处理改性,研究了活性炭性质对其吸附硝基苯性能的影响.以低温液氮(N2/77 K)吸附测定活性炭的比表面积和孔容、孔径分布;以Boehm滴定、零电荷点pHPZC的测定及元素分析定量表征活性发表面含氧官能团变化.结果表明:经改性后,活性炭比表面积及总孔容略有减小,表面性质发生较大变化.改性活性炭对硝基苯的吸附容量明显改变,吸附容量大小依次为:AC1′>AC0′>AC0>AC1.经硝酸氧化后,比表面积下降、存在过多表面含氧官能团是导致AC1吸附硝基苯能力降低的主要原因;而AC1'表面适量酚羟基所提供的氢键吸附是其对硝基苯吸附量增加的主要原因. 相似文献
2.
序列间歇式好氧活性污泥法处理生物制药废水研究 总被引:7,自引:0,他引:7
本研究采用好氧SBR法处理生物制药废水。试验结果表明,废水中不需另加氮磷营养物质,当进水CODCr为911~3280mg/L时,在曝气16h条件下,出水CODCr在350mg/L以下,BOD5在80mg/L以下,SS在150mg/L以下,皆达到生物制药工业废水二级排放标准。本文还对好氧SBR法的有机物降解动力学过程进行了研究。 相似文献
3.
通过对拆除前、拆除中、拆除后以及大修整个过程实施全方位安全技术管理,实现了全面的管理目标.取得了良好的社会效益和经济效益。 相似文献
4.
个人防护装备-鞋类检测方法、安全鞋、防护鞋和职业鞋4项国际新标准的简介与浅析 总被引:1,自引:0,他引:1
佘启元 《中国个体防护装备》2005,(4):23-28
1前言 国际标准化委员会(ISO)和欧洲标准化委员会(CEN)于2004年8月同时公布了个人防护装备——鞋类检测方法、安全鞋、防护鞋和职业鞋4项新标准,代替原来的8项标准。这是首次由ISO/TC94/SC3个人安全防护服和装备技术委员会足保护分技术委员会与CEN/TC161欧洲标准化委员会足腿保护技术委员会间的技术协作制定的标准,并采用统一标准名称、编号和年号。 相似文献
5.
Qin Hangdao Yang Yingchang Shi Wei She Yuanbin 《Environmental science and pollution research international》2021,28(21):26558-26570
Environmental Science and Pollution Research - Magnetic nanostructured MnFe2O4 with different morphologies, synthesized via chemical co-precipitation and hydrothermal method, was assayed as... 相似文献
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7.
张社 《中国安全科学学报》1992,2(1):57-61
安全性评价作为安全管理科学的一种方法,已在机电行业广泛开展,并取得一定成效,但通过实践,发现它仍有不足之处。就进一步完善“安全性评价标准”(下称“标准”)谈述见解,并力求以生产工具本质安全化的观点,编制了“产品设计安全性评价检查表”,试用此法,杜绝事故隐患。 相似文献
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9.
Analysis of trace dicyandiamide in stream water using solid phase extraction and liquid chromatography UV spectrometry 总被引:1,自引:0,他引:1
An improved method for trace level quantification of dicyandiamide in stream water has been developed. This method includes sample pretreatment using solid phase extraction. The extraction procedure (including loading, washing, and eluting) used a flow rate of 1.0 mL/min, and dicyandiamide was eluted with 20 mL of a methanol/acetonitrile mixture (V/V = 2:3), followed by pre-concentration using nitrogen evaporation and analysis with high performance liquid chromatography–ultraviolet spectroscopy (HPLC–UV). Sample extraction was carried out using a Waters Sep-Pak AC-2 Cartridge (with activated carbon). Separation was achieved on a ZIC®-Hydrophilic Interaction Liquid Chromatography (ZIC-HILIC) (50 mm × 2.1 mm, 3.5 μm) chromatography column and quantification was accomplished based on UV absorbance. A reliable linear relationship was obtained for the calibration curve using standard solutions (R2 > 0.999). Recoveries for dicyandiamide ranged from 84.6% to 96.8%, and the relative standard deviations (RSDs, n = 3) were below 6.1% with a detection limit of 5.0 ng/mL for stream water samples. 相似文献
10.
Jiangping Wu Ying Zhang Xiaojun Luo Yazhe She Lehuan Yu Shejun Chen Bixian Mai 《环境科学学报(英文版)》2012,24(2):183-194
Accelerated industrialization and urbanization, and unregulated disposal of waste of electric and electronic equipment (e-waste) in China have caused environmental pollution of brominated flame retardants (BFRs). This review summarized the levels, trends, and bioaccumulation characteristics of polybrominated diphenyl ethers (PBDEs) and other potential alternative BFRs including hexabromocyclododecanes (HBCDs), 1,2-bis(2,4,6-dibromophenoxy) ethane (BTBPE) and decabromodiphenylethane (DBDPE) in wildlife from China. PBDE levels in wildlife from China were generally higher than those from other parts in Asia, and were comparable to those from Europe but were lower than those from North America. However, wildlife from the e-waste recycling sites in South China and East China contained much higher PBDEs compared to other reports around the world, suggesting the heavy contamination of PBDEs in these regions. The alternative BFRs were also detected in wildlife, revealing that the animals are exposed to these chemicals, in addition to PBDEs. Temporal trends indicated by levels in marine mammals from South China suggested that PBDE levels increased from the beginning of 1990s to 2000s, but decreased from the middle of 2000s, followed by relatively steady levels. In contrast, HBCDs were found to be continuously increasing from 1997 to 2007, indicating the increasing usage of HBCDs in China in recent years. Compared to PBDE profiles found in other parts, aquatic species and birds from China contained relatively higher contributions of BDE-28 and 209, respectively, suggesting the possible different usage pattern of PBDEs. Future works including keeping monitoring at a reasonable scale and frequency to make sure levels near urban centers indicative of population do not increase are needed. Additionally, focus effort on e-waste recycling regions to look for impacts and to determine if regulation/controls are resulting in lower environmental contamination, and incorporation of sentinel species in monitoring efforts are recommended. 相似文献