共查询到14条相似文献,搜索用时 203 毫秒
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扩散法被动式挥发性有机化合物个体监测器的研制 总被引:4,自引:0,他引:4
研制了一种以单层活性炭颗粒作为吸收介质的被动式挥发性有机化合物个体监测器。空气中挥发性有机化合物依据分子扩散原理传质到采样器中,并吸附到活性炭上。采样后,取出活性炭吸附层,用二硫化碳洗脱,再用气相色谱法定性和定量。对监测器进行了实验室性能评价和现场验证。结果表明,采样器在风速20~150cm/s,相对温度10%~80%,温度-10~35℃范围内使用,采样速率分别为60ml/min(苯)、54ml/min(甲苯)、54ml/min(氯仿)和49ml/min(对-二甲苯),相对标准差小于5%。在现场与有泵活性炭管采样相比较,本个体监测器测定空气中挥发性有机化合物的总不确定度分别为12%(苯)、12%(甲苯)、26%(对-二甲苯)和16%(氯仿),可适用于室内空气污染和个体接触量的监测。 相似文献
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低浓度挥发性有机化合物被动式个体采样器的研究 总被引:1,自引:0,他引:1
研制了扩散式挥发性有机化合物(VOCs)个体采样器,适用于对环境空气中和非职业性个体接触VOCs的监测。在风速10~260cm/s,相对湿度为30%~80%,温度为10~30℃的范围内使用,采样速率分别为苯:25.74ml/min,甲苯:25.16ml/min,四氯乙烯:25.85ml/min,对-二甲苯:8.16ml/min,苯乙烯:6.47ml/min。与主动式活性炭纤维(ACF)管采样法比较,本个体采样器测定空气中靶VOCs的总不确定度均在±25%以内。 相似文献
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扩散法被动式个体采样器的设计原理、试验装置和性能评价方法 总被引:7,自引:1,他引:6
介绍了被动式个体采样器的设计原理实验装置和性能评价方法。分别测定了对10种主要室内气体污染物[SO2、NO2、CO2、NH3、HCHO、HF、C6H6、C6H5·CH3、C6H4·(CH3)2、CHCl3]的采样速率(单面采样50~140ml/min,双面增加一倍),相对标准差<10%,与有动力的标准方法相比较,总不确定度<±25%。这种采样器体积小似一枚徽章,重量轻仅10g,使用方便。现场验证和使用表明,可适用于室内空气污染和个体接触量的监测。 相似文献
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本文报道一种简便、快速而灵敏的空气中硝基苯的示波极谱测定法。在EDTA-NaOH碱性介质中,硝基苯在-0.63伏(Vs.SCE)处产生一灵敏的二阶导数还原峰,峰电流与硝基苯的含量在0~25.0μg/10ml范围内呈良好线性关系。以(1+9)乙醇作吸收液,直型多孔玻板吸收管作采集器,以0.5L/min流速采样5~10min。取一定量样液加碱后可立即测定。本法检出下限为0.05μg/10ml,加标回收率为94.2~108.0%,平均值为100.0%。相对标准差为2.4~6.4%,合并相对标准差为5.5%。经气相色谱法验证,本法结果与之无显著性差异。 相似文献
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车间空气中丙炔醇用硅胶管(溶剂解吸型)采样,纯水解吸,10%FFAP/chromosorbW AW色谱柱分离,氢焰离子化检测器检测。色谱条件为柱长2m、内径3mm的不锈钢柱。柱温110℃,汽化室温180℃,载气(N2)流量50ml/min。在上述色谱条件下,丙炔醇的保留时间2.09min。直线回归方程为Y=1243.4R=0.9999,在5-50μg/ml范围内呈线性关系。检出限为1.45*10^ 相似文献
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目的研制测定空气中甲醛的被动式个体采样器。方法根据费克第一扩散定律设计新型被动式个体采样器,并对采样器的性能指标进行评价。结果在温度为10~40℃,湿度为20%~40%,风速为50~600 cm/s的范围内,被动式采样器测定空气中甲醛采样流量为104.05 ml/min,最大吸附容量为0.275 1 mg,最短采样时间为30 min,用前稳定性30 d,样品稳定性≥14 d,精密度RSD为5.34%。结论研制的个体采样器可以作为一种测定空气中甲醛的新型采样仪器。 相似文献
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M Berglund M Vahter G Bylin 《Journal of exposure analysis and environmental epidemiology》1992,2(3):295-307
A passive (filter badge) sampler for personal NO2 exposure measurements was tested in a laboratory setting (exposure chamber), and in the field--outdoors, during periods of high relative humidity (mean 85%) and low temperature (-5 to +10 degrees C), and indoors, in an ice-hockey arena--using chemiluminescence as a reference method. Parallel measurements of NO2 in the exposure chamber (concentration range 100-825 micrograms NO2/m3) for 15, 30, and 60 min sampling periods, showed good agreement between methods. The concentrations obtained with passive samplers were 78 to 122% (mean 94%, SD +/- 11, N = 39) of those obtained with chemiluminescence, using a sampling rate (K'OG) of 0.14 cm/sec. The detection limits were 320, 160, and 80 micrograms NO2/m3 for 15, 30, and 60 minutes of sampling, respectively. Outdoors (concentration range 15-102 micrograms NO2/m3, concentrations obtained with passive samplers were consistently lower than concentrations obtained with chemiluminescence (mean 79%, SD +/- 9.3%, range 61-95%, N = 25), using the K'OG of 0.14 of cm/sec (Passive samplerNO2 = 0.67ChemilumNO2 + 4.5). A better agreement between concentrations obtained with passive samplers and chemiluminescence was achieved with a K'OG of 0.11 cm/sec (mean 100%, SD +/- 12%, range 78-121%, Passive samplerNO2 = 0.84 ChemilumNO2 + 6.4). Indoors (concentration range 210-3895 micrograms NO2/m3), concentrations obtained with passive samplers were 70 to 113% (mean 90%, SD +/- 16%) of the concentrations obtained with chemiluminescence (Passive samplerNO2 = 1.00ChemilumNO2 - 93) using a K'OG of 0.10 cm/sec. Duplicate samples collected indoors N = 18) and outdoors (N = 31) showed a variability (coefficient of variation, or CV) of less than 6%. It was concluded that the passive sampler is useful for measuring personal daily exposure as well as peak exposure. It is necessary to determine sampling rates for various environmental conditions. 相似文献
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目的:建立豆类中嘌呤含量测定的高效液相色谱法(HPLC)。方法:采用10%(v/v)高氯酸溶液在100℃水浴中水解样品60 min,样品液调节pH值,过滤后,进行色谱分析。色谱柱为Agilent ZORBAX Eclipse XDB-C18(250×4.6 mm,5μm),柱温25℃,流动相为0.007 mol/L KH2PO4(pH=4.0),流速1.0 ml/min,紫外检测器254 nm处检测,进样量为20μl。结果:在0.1 mg/L~25 mg/L的浓度范围内,各嘌呤的响应峰面积与浓度呈良好线性相关,r>0.9997,相对标准偏差<8.74%,样品加标回收率为85.9%~104.3%。结论:该方法测定豆类中嘌呤含量,具有简便快速、结果准确可靠、重现性好等优点。不同豆类的嘌呤总含量在58.2~158.1 mg/100 g之间。 相似文献