Monteleone Marcello, Di Luca Giuseppe, Filomia Marcello, Fuoco Alessio, Figoli Alberto, Jansen Johannes Carolus
Institute on Membrane Technology, National Research Council of Italy (CNR-ITM), via P. Bucci 17/C, 87036 Rende, Italy.
Department of Chemistry & Chemical Technologies, University of Calabria, via P. Bucci, 87036 Rende, Italy.
Methods Protoc. 2024 Jul 15;7(4):55. doi: 10.3390/mps7040055.
During the production and laying phases of hot-mixing asphalt (HMA), various volatile organic compounds (VOCs) and noxious gases such as HS are released into the atmosphere. These emissions are a serious environmental problem, a risk to human health, and expose workers and residents to unfriendly odours. The aim of this study was the development of a fast and sensitive analytical method to detect the HS emitted from hot bituminous binder that is generally used in the various stages of asphalt production, processing, handling and during road construction. The method consisted in the analysis of evolved HS from a flask with molten bitumen, using nitrogen as a carrier gas to lead the volatile compounds into a residual gas analyser equipped with a quadrupole mass spectrometer. The analysis was performed following the HS-specific signals at / 33 (HS) and at / 34 (HS) in real time, directly on the sample without laborious and expensive pre-treatments and with short response times (<6 s). Calibration with a standard mixture of 1000 ppm of HS in nitrogen allows semi-quantitative HS detection. The sensitivity and rapidity of the method were evaluated by quenching the release of sulphur compounds with commercial odour-suppressing agents. Upon addition of 0.1% of additive in two minutes, the HS signal drops about 80% in two minutes, confirming the good response of the method, even with a very complex matrix.
在热拌沥青（HMA）的生产和铺设阶段，各种挥发性有机化合物（VOCs）和诸如硫化氢等有害气体被排放到大气中。这些排放是一个严重的环境问题，对人类健康构成风险，还会让工人和居民接触到难闻的气味。本研究的目的是开发一种快速且灵敏的分析方法，以检测在沥青生产、加工、处理的各个阶段以及道路建设过程中普遍使用的热沥青结合料所释放的硫化氢。该方法包括对装有熔融沥青的烧瓶中逸出的硫化氢进行分析，使用氮气作为载气将挥发性化合物导入配备四极杆质谱仪的残余气体分析仪中。分析是通过实时跟踪硫化氢在质荷比/33（硫化氢）和质荷比/34（硫化氢）处的特定信号来进行的，直接对样品进行分析，无需繁琐且昂贵的预处理，响应时间短（<6秒）。用氮气中1000 ppm硫化氢的标准混合物进行校准可实现半定量硫化氢检测。通过用市售气味抑制剂抑制硫化合物的释放来评估该方法的灵敏度和快速性。在两分钟内添加0.1%的添加剂后，硫化氢信号在两分钟内下降约80%，证实了该方法即使在非常复杂的基质中也具有良好的响应。
