Institute of Environmental Engineering, Polish Academy of Sciences, 34 M. Skłodowska-Curie St., 41-819 Zabrze, Poland.
Int J Environ Res Public Health. 2020 Jul 17;17(14):5180. doi: 10.3390/ijerph17145180.
The present study describes the effects of temperature and humidity on the level of water absorption by filter blanks most popularly used for gravimetric analyzes of particulate matter (PM) and the effects of those on the accuracy of its weight measurements. The main parts of the research quantified the effect of temperature and humidity conditions on water contents quartz fiber (Q), fiberglass (G), PTFE, and nylon (N) filters. Supplementary studies were conducted to estimate the effects of temperature, humidity and material on mass loss/gain and the shape of water retention. All chemical analyses of water contents were performed by the Karl Fischer titration method. The results indicate that quartz filters are the most susceptible to the variations in water contents under changing humidity levels and therefore, less suitable to high accuracy determinations of PM mass compared to nylon or glass filters; PTFE performed the best due to their hydrophobicity. For PM water contents determinations, the best choice of filter media is PTFE. Although many other factors determine the choice of filter type for PM analyses, the present study is an important contribution to knowledge of assessing the suitability of different types of filter material for specific measurements.
本研究描述了温度和湿度对最常用于重量分析颗粒物（PM）的滤空白的吸水率的影响，以及这些因素对其重量测量精度的影响。研究的主要部分量化了温度和湿度条件对石英纤维（Q）、玻璃纤维（G）、PTFE 和尼龙（N）过滤器含水量的影响。补充研究旨在估计温度、湿度和材料对质量损失/增益和水分保持形状的影响。所有水分含量的化学分析均采用卡尔费休滴定法进行。结果表明，石英滤器在湿度变化下对水分含量的变化最敏感，因此与尼龙或玻璃滤器相比，不太适合高精度测定 PM 质量；由于其疏水性，PTFE 的性能最好。对于 PM 水分含量的测定，PTFE 是最佳的滤材选择。尽管许多其他因素决定了 PM 分析中滤器类型的选择，但本研究对评估不同类型的滤料在特定测量中的适用性提供了重要的知识贡献。
