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Identification of Odor-Active Organic Sulfur Compounds in Gypsum Products

机译：石膏产品中气味活性有机硫化合物的鉴定

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摘要

Gypsum is widely used in building products, e.g., as drywall, stucco or constituent in mortar, because it is easy to handle and it is assigned creating a good indoor air quality. Odor analysis of a gypsum product with a sulfurous off-odor by means of gas chro-matography-olfactometry compared to two unobtrusive commercial gypsum products revealed - apart from typical odor compounds previously found in building products like aldehydes, ketones and acids - various organic sulfur compounds as odorants at very small concentrations (<1 μg/m~3) not allowing structural identification. Gypsum deposits naturally contain impurities and elemental sulfur, which can react in nature due to tectonic pressure and temperature or during production with organic compounds, e.g., from beater additives, to form organic sulfur compounds. Odor analysis of a gypsum raw material and its semi-processed product from a Chinese deposit with a very intense sulfurous off-odor revealed high concentrations of organic sulfur compounds, which were identical in analytical, chromatographic and sensory properties to the unidentified sulfur compounds of the commercial products and are therefore suitable for structural identification of those unknowns. In this way, a number of sulfides, disulfides, thiols and aromatic sulfur compounds could be identified as contributing to the odor of gypsum products.
机译：石膏被广泛用于建筑产品中，例如用作干墙，灰泥或砂浆中的成分，因为它易于处理并且具有良好的室内空气质量。通过气相色谱-嗅觉法对含硫异味的石膏产品进行气味分析，与两种不引人注目的商业石膏产品进行对比分析，结果表明，除了以前在醛，酮和酸等建筑产品中发现的典型气味化合物外，还有各种有机硫浓度极低（<1μg/ m〜3）的化合物作为气味剂，无法进行结构鉴定。石膏沉积物自然含有杂质和元素硫，它们由于构造压力和温度或在生产过程中与有机化合物（例如来自搅拌器添加剂）的反应而自然反应形成有机硫化合物。对来自中国矿床的石膏原料及其半成品的气味分析显示出强烈的亚硫臭味，发现高浓度的有机硫化合物，其分析，色谱和感官特性与未鉴定的硫磺化合物相同。商业产品，因此适用于这些未知物的结构鉴定。这样，可以确定许多硫化物，二硫化物，硫醇和芳族硫化合物都有助于石膏产品的气味。

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