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11.
GB/T 18204.26《公共场所空气中甲醛测定方法》中的酚试剂分光光度法,其方法原理是空气中甲醛与酚试剂反应生成嗪,嗪在酸性溶液中被高铁离子氧化形成蓝绿色化合物。根据颜色深浅,比色定量。两步反应在室温较低时作用不完全。吸光度随时间延长而逐渐加大。文章经过不同室温实验提出,在室温低于23℃时,两步反应应在恒温水浴43℃保温10min。室温达到23℃时可不必加热。 相似文献
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通过对1例住宅装修中甲醛超标引起户主外周血贫血病例的分析,评价甲醛对人体健康的危害,简述室内空气污染物对人体健康的危害。 相似文献
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MnxCe1- xO2(x: 0.3–0.9) prepared by Pechini method was used as a catalyst for the thermal catalytic oxidation of formaldehyde(HCHO). At x = 0.3 and 0.5, most of the manganese was incorporated in the fluorite structure of Ce O2 to form a solid solution. The catalytic activity was best at x = 0.5, at which the temperature of 100% removal rate is the lowest(270°C). The temperature for 100% removal of HCHO oxidation is reduced by approximately 40°C by loading 5 wt.% Cu Oxinto Mn0.5Ce0.5O2. With ozone catalytic oxidation, HCHO(61 ppm) in gas stream was completely oxidized by adding 506 ppm O3 over Mn0.5Ce0.5O2 catalyst with a GHSV(gas hourly space velocity) of 10,000 hr-1at 25°C. The effect of the molar ratio of O3 to HCHO was also investigated. As O3/HCHO ratio was increased from 3 to 8, the removal efficiency of HCHO was increased from 83.3% to 100%. With O3/HCHO ratio of 8, the mineralization efficiency of HCHO to CO2 was 86.1%. At 25°C, the p-type oxide semiconductor(Mn0.5Ce0.5O2) exhibited an excellent ozone decomposition efficiency of 99.2%,which significantly exceeded that of n-type oxide semiconductors such as Ti O2, which had a low ozone decomposition efficiency(9.81%). At a GHSV of 10,000 hr-1, [O3]/[HCHO] = 3 and temperature of 25°C, a high HCHO removal efficiency(≥ 81.2%) was maintained throughout the durability test of 80 hr, indicating the long-term stability of the catalyst for HCHO removal. 相似文献
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Yaodong Guo Zhaoying Di Xiaonan Guo Ying Wei Runduo Zhang Jingbo Jia 《环境科学学报(英文版)》2023,35(3):135-147
Pt catalysts with nitrogen-doped graphene oxide (GO) as support and CeO2 as promoter were prepared by impregnation method,and their catalytic oxidation of formaldehyde (HCHO) at room temperature was tested.The Pt-CeO2/N-rGO (reduced GO) with a mass fraction of 0.7% Pt and 0.8%CeO2 exhibited an excellent catalytic performance with the 100% conversion of HCHO at room temperature.Physicochemical characterization demonstrated that nitrogendoping greatly increased the... 相似文献
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针对水质中甲醛测定时试剂水、pH值、乙酰丙酮试剂、加热温度和显色时间等影响因素进行了讨论,并提出了减小空白值的对策. 相似文献
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装饰材料所致的室内空气污染 总被引:25,自引:0,他引:25
对商业、工业、住宅等不同功能区和不同室内燃料的厨房、卧室、教室等室内房间,作了空气中甲醛的本底值调查。调查表明,甲醛浓度范围为0.0007-0.0125mg/m^3。对15户普通家庭装潢户的调查表明,经装潢后1年以上测得的甲醛,总烃、苯、甲苯平均浓度分别为0.02、0.50、0.76、1.25mg/m^3。氯乙烯、苯乙烯未测出。其中甲醛平均浓度高出本底值20倍,为前苏联建议的日平均浓度的1.6倍。 相似文献