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试验了废水中的丙溴磷气相色谱分析方法。以大口径毛细管柱分离废水中的丙溴磷,分别采用氮磷检测器(NPD)和电子捕获检测器(ECD)检测,得到了良好的分离效果和较高的灵敏度,方法检测限为0.002mg/L(绝对检测量最低可达2pg,NPD)和0.0008mg/L(绝对检测量最低可达0.8pg,ECD)。该方法中,采用双柱双检测器,排除了误检和其他物质的干扰,保证了分析结果的可靠性。 相似文献
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毛细管气相色谱法测定环境空气中的氯仿 总被引:3,自引:0,他引:3
用活性炭采样管富集环境空气中的氯仿,以二硫化碳为解吸剂,经毛细管柱GC/ECD测定样品中的氯仿,以保留时间定性,峰高定量. 相似文献
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气相色谱法测定环境空气中的卤代烃 总被引:4,自引:0,他引:4
用活性炭采样管富集环境空气中的卤代烃,以二硫化碳为解吸剂,经毛细管柱GC/ECD测定样品中的卤代烃,以保留时间定性,峰面积定量. 相似文献
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微波萃取-双ECD气相色谱法测定土壤中的多氯联苯 总被引:2,自引:0,他引:2
建立了利用微波萃取和双ECD联用技术,对土壤中多氯联苯(PCB)的分析方法,通过对回收率、重现性及精密度的测定,其结果均优于传统索氏萃取方法。利用微波萃取可快速、准确、有效地测定土壤中PCB。 相似文献
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水中酚类优先监测物的气相色谱测定法 总被引:1,自引:1,他引:1
介绍测定环境水质中重点酚类污染物的色谱法,应用衍生化的前处理方法,分别采用填充柱和毛细管柱分离,氢焰检测器(FID)和电子捕获检测器(ECD)测定使用美国EPA的质量控制样品(QC),确定了方法的精密度和准确度. 相似文献
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硝基苯类国内外一般均采用有机溶剂萃取后气相色谱法分析,在GC条件选择上用FID、ECD两种检测器和填充柱、毛细柱两种柱型.溶剂萃取法虽然富集倍数大,但选择性较差.给GC分离带来困难且所用的芳烃溶剂毒性较 相似文献
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介绍了世界上一些发达国家的空气污染预报的做法和采取的措施,阐述了我国开展空气质量预报的方针和方法,指出了周报是预报的基础工作。叙述了我国空气质量周报的污染参数的选取、污染指数的分级及其浓度限值和污染指数计算及确定,分析并总结了开展城市空气质量周报所发挥的效用是提高公众的环保意识,加大了治理污染的力度,转变了环境监测的职能,促进了环境监测事业的发展 相似文献
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锅炉烟尘测试中锅炉负荷率的计算方法探讨 总被引:1,自引:1,他引:0
GB5468 -91规定 ,锅炉烟尘测试时 ,必须对锅炉的运行负荷进行测试 ,而实际监测过程中 ,许多锅炉房不具备测试的计量条件 ,为了解决这一问题 ,文章提出利用烟气量和空气过剩系数计算锅炉负荷率。在实际监测工作中 ,该方法方便、易于操作 ,所得结果和标准规定方法所得结果有很好的一致性 相似文献
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实验室质量管理体系内部审核的实施 总被引:3,自引:0,他引:3
在实施GB/T15481-2000 idt ISO/IEC17025:1999标准《检测和校准实验室能力的通用要求》的过程中,通过实验室质量管理体系内部审核的实践与系统分析,识别出内部审核实施阶段的关键环节,提出召开首次会议、收集审核证据、确定审核发现和召开末次会议的技术方法,对提高内部审核的质量和有效性、获得可靠的审核结论具有重要意义。 相似文献
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This study assesses the efficiency of various physico-chemical, biological and other tertiary methods for treating leachate.
An evaluation study on the treatability of the leachate from methane phase bed (MPB) reactor indicated that at an optimum
hydraulic retention time of 6 days, the efficiency of the reactor in terms of biological oxygen demand (BOD) and chemical
oxygen demand (COD) removal was 91.29 and 82.69%, respectively. Recycling of the treated leachate through the municipal solid
waste layers in the leachate recycling unit (LRU) resulted in a significant increase in the biodegradation of organics present
in the leachate. Optimum BOD and COD removal efficiencies were achieved at the third recycle; additional recycling of the
leachate did not produce any significant improvement. Physico-chemical treatment of the leachate demonstrated that alum and
lime (Option 2) were more economical than coagulants lime and MgCO3. A cost analysis of the economics of the various treatments revealed that the alternative treatment consisting of a MPB bed
followed by a LRU and aerated lagoon is the most cost-effective treatment. However, the alternative consisting of a MPB followed
by the LRU and a soil column, which is slightly more costly, would be the most appropriate treatment when adequate land is
readily available. 相似文献
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实验室质量管理体系内部审核的策划 总被引:2,自引:0,他引:2
在实施GBT15481-2000(idtISOIEC17025:1999)标准《检测和校准实验室能力的通用要求》的过程中,通过实验室质量管理体系内部审核的实践与系统分析,识别出内部审核策划阶段的关键环节,提出审核范围确定、审核计划和抽样方案制订的技术方法,为有序高效地实施内部审核提供了行动指南。 相似文献
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Alexis Lugo-fernández Pasquale F. Roscigno 《Environmental monitoring and assessment》1999,55(2):319-346
Substantial amounts of NOx (146 000 t/y) and total hydrocarbons (294 000 t/y) are released to the marine atmosphere by the large number of oil and gas operations over Federal waters of the Gulf of Mexico (GOM). Under appropriate meteorological conditions these emissions react to form ozone (0–54 g/m3 over-water) which can affect the marine environment. Using a dry deposition model, this work examines the amount of ozone derived from oil and gas offshore operations and deposited in the sea surface of the Gulf of Mexico, and assesses its impact on the neuston of the sea-surface microlayer. Surface integrated estimates of ozone deposited from oil and gas operations over the sea surface ranges from 400 kg to 1800 kg which results in sea surface concentrations of 15 g/m3. This estimate and the actual toxic ozone levels suggest no acute, toxic impacts to the neuston. However, indirect effects may occur through changes to the pelagic foodwebs and organic carbon pathways. Another potential pathway for ozone impacting the environment is through the production of bromate. Based on the concentrations and time scales (11–139 days) only sublethal effects appear to occur, but uncertainties associated with this assessment need to be further studied. From an ecological perspective, the environmental impacts and risks of NOx and VOC discharges from offshore platforms need to be assessed for neuston and other components of the marine ecosystem. 相似文献
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液氯泄漏事件的环境安全防护距离与监测布点方法 总被引:1,自引:0,他引:1
以大气湍流扩散模型为基础,结合大气环境基本资料和氯气的性质,提出了氯气泄漏突发事件的应急防护范围,为发生类似事件时的人群撤离范围和布点监测、监控范围,提出了一种思路,供大家参考. 相似文献
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环境监测是环境管理的基础性工作,污染源监测报告(数据)的有效性是保证环境执法严肃、公正的重要条件,也是是守法企业展示良好社会形象的基本保证。依照国家的相关规定,并结合行业技术规范的要求,探讨污染源监测报告的有效期问题,以利于相关各方严肃、科学、合理地使用污染源监测数据。 相似文献