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Field Sampling Method for Quantifying Odorants in Humid Environments

机译：潮湿环境中气味定量的现场采样方法

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摘要

Most air quality studies in agricultural environments use thermal desorption analysis for quantifying semivolatile organic compounds (SVOCs) associated with odor. The objective of this study was to develop a robust sampling technique for measuring SVOCs in humid environments. Test atmospheres were generated at ambient temperatures (23 ± 1.5 ℃) and 25, 50, and 80% relative humidity (RH). Sorbent material used included Tenax, graphitized carbon, and carbon molecular sieve (CMS). Sorbent tubes were challenged with 2, 4, 8,12, and 24 L of air at various RHs. Sorbent tubes with CMS material performed poorly at both 50 and 80% RH due to excessive sorption of water. Heating of CMS tubes during sampling or dry-purging of CMS tubes post sampling effectively reduced water sorption with heating of tubes being preferred due to the higher recovery and reproducibilrty. Tenaxtubes had breakthrough of the more volatile compounds and tended to form artifacts with increasing volumes of air sampled. Graphitized carbon sorbent tubes containing Carbopack X and Carbopack C performed best with quantitative recovery of all compounds at all RHs and sampling volumes tested. The graphitized carbon tubes were taken to the field for further testing. Field samples taken from inside swine feeding operations showed that butanoic acid, 4-methylphenol, 4-ethylphenol, indole, and 3-methylindole were the compounds detected most often above their odor threshold values. Field samples taken from a poultry facility demonstrated that butanoic acid, 3-methylbutanoic acid, and 4-methylphenol were the compounds above their odor threshold values detected most often, relative humidity, CAFO, VOC, SVOC, thermal desorption, swine, poultry, air quality, odor.
机译：农业环境中的大多数空气质量研究都使用热脱附分析来量化与气味相关的半挥发性有机化合物（SVOC）。这项研究的目的是开发一种可靠的采样技术来测量潮湿环境中的SVOC。在环境温度（23±1.5℃）和25％，50％和80％的相对湿度（RH）下产生测试气氛。所用的吸收剂材料包括Tenax，石墨化碳和碳分子筛（CMS）。在各种相对湿度下，用2、4、8、12和24 L的空气挑战吸收剂管。由于水的过度吸附，含CMS材料的吸附管在50％和80％RH下均表现不佳。在采样过程中对CMS管进行加热或在采样后进行CMS管的干式清洗可有效降低吸水率，由于较高的回收率和可重复性，优选对管进行加热。 Tenaxtubes突破了挥发性较大的化合物，并随着空气采样量的增加而倾向于形成假象。包含Carbopack X和Carbopack C的石墨化碳吸附剂管在所有RH和测试样品量下定量回收所有化合物的情况下表现最佳。石墨化碳管被带到现场进行进一步测试。从猪饲喂内部进行的田间采样显示，丁酸，4-甲基苯酚，4-乙基苯酚，吲哚和3-甲基吲哚是最常检测到的高于其气味阈值的化合物。从家禽场获得的田间样品表明，丁酸，3-甲基丁酸和4-甲基苯酚是高于其气味阈值的最常检测到的化合物，相对湿度，CAFO，VOC，SVOC，热脱附，猪，家禽，空气质量，气味。

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