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161.
162.
乐果降解菌LGX1的筛选及其降解特性研究 总被引:1,自引:0,他引:1
通过富集培养,从连续施用农药乐果的土壤中分离得到一株具有较强降解有机磷农药乐果能力的细菌菌株LGX1,通过菌落形态观察及细菌的16SrDNA测序,对其进行了鉴定,同时初步研究了其降解性能。结果表明:该菌株为蜡状芽孢杆菌(Bacillus cereus),在接种量为20%,乐果初始质量浓度为100mg·L-1,外加碳源葡萄糖质量分数为2%,温度为35℃,初始pH值为4时该菌株对乐果的降解能力最强;并且能在以辛硫磷、毒死蜱和三唑磷为唯一碳源的基础盐培养基中生长,且均比在以乐果为唯一碳源的基础盐培养基中生长的OD600值要高,初步推断菌株LGX1对有机磷农药的降解有一定的广谱性。 相似文献
163.
Sequential extraction was used to study operationally determined chemical forms (exchangeable, carbonate, reducible metal, oxidisable metal and the residual fractions) of the metals Cd, Cu, Zn and Pb in sediments from 12 sample sites collected from the north-western part of the Red Sea, where improper recreational facilities have resulted in diverse impacts on the coastal environments fronting some of the recreation projects. The results showed that the average percentage of each phase was different among metal types; the residual binding fraction was the most important phase for binding Zn and to a lesser degree Cu. The reducible fraction was the second most important phase for Zn and Cu. For Pb, the fractions bounded to the residual fractions and the reducible phases are equal and exhibited the highest percentages. By contrast, the carbonate fraction was predominant for Cd. The percentages of Cd, Cu, Zn and Pb associated with the carbonate and exchangeable fractions, which are potentially the most harmful to the environment, were calculated and assessed at different sampling sites of the studied sediments. According to the Risk Assessment Code (RAC), the results reveal that Cd is the only metal that poses a high risk to the environment. 相似文献
164.
ABSTRACTSeven volcanic rocks samples were collected from Southern Qinghai to analyze chemical speciation and migration behavior of heavy metals by sequential chemical extraction procedure and column leaching test. The geo-accumulation index, ecological risk index and the risk assessment code were applied to assess the heavy metal pollution and potential environmental effects in this area. Results revealed that the total concentrations of heavy metals did not exceed the background values in soil of this area. Most of the samples produced acid rock drainage. The order of heavy metal migration and transformation sequence in the volcanic rocks of Zhiduo region was Cd?>?Pb?>?As?=?Cu?=?Zn?=?Mn based on the geo-accumulation index and Cd caused heavy pollution, which was also confirmed by the leaching test. Moderate potential ecological risk posed by heavy metals occurred in the study area based on the potential ecological risk index. Cd contributed to most of ecological risk while the remaining heavy metals (except As) exerted medium to high risks to the environment according to the risk assessment code evaluation results. In summary, volcanic rocks possessed potential risks to the surroundings due to potential release of heavy metals. Cd that caused the pollution should be paid special attention. 相似文献
165.
朱清明 《中国安全生产科学技术》2012,8(3):193-197
对一艘船舶而言,由于其货物、人员、贸易航线具有流动性、危险性和隐蔽性等特点,存在着不同程度被恐怖主义利用和攻击的威胁风险,并且一旦发生保安事件所带来的后果非常严重,包括人命伤害、财产损失、环境破坏,甚至引起社会恐慌等,因此,船舶保安已成为国际航运界关注的焦点。本文根据风险管理原理,结合ISPS规则要求,确定船舶保安风险管理流程,并对船舶面临的保安威胁进行辩识分析,提出旨在降低船舶可能遭受恐怖威胁的保安措施,以指导航运企业保安工作的开展。 相似文献
166.
刘增青 《中国安全生产科学技术》2012,8(4):180-182
通过对现行住宅及消防相关规范规定、条文解释的比照与分析,结合即将出台《建筑设计防火规范》、《高层民用建筑设计防火规范》合并的拟修订《建筑设计防火规范》稿及相关规定,根据住宅火灾危害表征及建设工程消防设计审核实践工作经验总结,提出对于高层住宅建筑消防车通道设置,建议可按现行《住宅建筑规范》规定执行,同时充实了新的消防登高车操作面、坡度、场地大小等要求,使得高层住宅消防车通道要求具体化。 相似文献
167.
This study investigates the partitioning of metals in surface sediments from the Dan River drainage basin, the source of drinking water for the South to North Water Transfer Project, China, to determine their bioavailability and associated levels of risk. Sediment samples were collected from 99 sites along the Dan River, and the concentration of each element fraction was determined using sequential extraction and inductively coupled plasma-mass spectrometry. The residual fraction was the major phase for most metals sampled. Among the non-residual fractions, greater proportions of Zn, Mn and Cd were transported in in the available phase, whereas Ba, Sb, Pb and As were mainly found in the reducible phase. The oxidisable phase was important for the transport of Ni, Co, Cr and Cu in sediments. This analysis of sediments from the Dan River basin indicates a very high risk of pollution from Cd, Co, Mn, Sb and Zn. Combined with the sediments with extremely high concentrations, the Dan, Laoguan and Yinhua rivers, which have been affected by ore-mining activities, pose a very high risk to the surrounding areas and should be the subject of future studies. 相似文献
168.
本文分析了特种设备安全技术规范的含义、法律地位和作用,介绍了欧盟指令中基本安全要求的主要内容以及和标准的关系等,重点论述了特种设备安全与风险的关系、特种设备基本安全要求的范围、本质安全的含义、特种设备损伤机理和失效模式分析的要求,提出了特种设备基本安全要求的确定原则。 相似文献
169.
安全投入问题 总被引:1,自引:2,他引:1
陈森尧 《中国安全科学学报》1992,2(2):26-34
论述了生产特征与安全投入的关系以及安全投入的属性、体系和内涵,提出需求和能力决定安全投入的一些建议。 相似文献
170.