Odours in Asphalt: Analysis of the Release of H2S from Bitumen by a Mass Spectrometric Residual Gas Analyser

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-07-15 DOI:10.3390/mps7040055

Marcello Monteleone, Giuseppe Di Luca, Marcello Filomia, A. Fuoco, A. Figoli, J. C. Jansen

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Abstract

During the production and laying phases of hot-mixing asphalt (HMA), various volatile organic compounds (VOCs) and noxious gases such as H2S 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 H2S 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 H2S 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 H2S-specific signals at m/z 33 (HS+) and at m/z 34 (H2S+) 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 H2S in nitrogen allows semi-quantitative H2S 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 H2S signal drops about 80% in two minutes, confirming the good response of the method, even with a very complex matrix.

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沥青中的气味：用质谱残余气体分析仪分析沥青中释放的 H2S

在热拌沥青（HMA）的生产和铺设阶段，各种挥发性有机化合物（VOC）和有害气体（如 H2S）会释放到大气中。这些排放物是一个严重的环境问题，对人类健康构成威胁，并使工人和居民受到不友好气味的影响。这项研究的目的是开发一种快速灵敏的分析方法，用于检测热沥青粘结剂排放的 H2S，这种粘结剂通常用于沥青生产、加工、处理和道路建设的各个阶段。该方法包括分析从装有熔融沥青的烧瓶中挥发出来的 H2S，使用氮气作为载气，将挥发性化合物导入配备四极质谱仪的残余气体分析仪。分析是根据 m/z 33（HS+）和 m/z 34（H2S+）处的 H2S 特定信号实时进行的，直接在样品上进行，无需费力和昂贵的预处理，响应时间短（<6 秒）。使用氮气中 1000 ppm 的 H2S 标准混合物进行校准，可实现半定量 H2S 检测。通过使用商用气味抑制剂淬灭硫化合物的释放，对该方法的灵敏度和快速性进行了评估。在两分钟内加入 0.1% 的添加剂后，H2S 信号在两分钟内下降了约 80%，这证实了该方法即使在基质非常复杂的情况下也能做出良好的反应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.