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Sensory evaluation in test chambers: Influences of direct and indirect assessment

机译：试验箱中的感官评估：直接和间接评估的影响

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The release of volatile organic compounds from building products may influence the perceived air quality in the indoor environment. Consequently, building products need to be assessed for the acceptability of emitted odors. The standard ISO 16000-28 describes the evaluation of perceived odor in test chambers with trained panelists, being calibrated with diluted acetone. For the direct odor assessment, ISO 16000-28 requires an air flow of 0.6-1.0 l/s at the chamber outlet. To meet these conditions under normal air exchange rates, the minimum chamber volume is about 3 m(3). If smaller chambers are used, air must be collected into containers for an indirect assessment. Procedures for the handling of the containers are provided in the ISO standard. Nevertheless, the indirect assessment method has a number of pitfalls and drawbacks. Experiments with sampling-container materials such as Nalophan (TM) and Tedlar (R) and different sampling techniques (continuous vs. discontinuous) have shown that the composition of sampled air might be influenced by the container material due to sink effects and leakage. The recoveries of the target VOCs in the sampling container decreased in dependence of decreasing vapor pressure and increasing octanol/air distribution coefficient.1-butanol and 1-hexanol have high recovery rates in Nalophan (TM) containers. These substances therefore appeared to be suitable for investigations into the synergistic odor effect. It could be shown that mixtures of 1-butanol and 1-hexanol have no clear additive effect in the sensory evaluation. This calls into question the practical relevance of an odor guide-value concept based on individual substance evaluations.
机译：建筑产品中挥发性有机化合物的释放可能会影响室内环境中的感知空气质量。因此，需要评估建筑产品散发气味的可接受性。 ISO 16000-28标准描述了由受过专门培训的小组成员对测试室中感知到的气味的评估，并用稀释的丙酮进行​​了校准。为了直接进行气味评估，ISO 16000-28要求箱室出口的空气流量为0.6-1.0 l / s。为了在正常空气交换率下满足这些条件，最小腔室容积约为3 m（3）。如果使用较小的腔室，则必须将空气收集到容器中以进行间接评估。 ISO标准中提供了处理容器的程序。但是，间接评估方法存在许多缺陷和弊端。使用Nalophan（TM）和Tedlar（R）等采样容器材料进行的实验以及不同的采样技术（连续与不连续）表明，由于下沉效应和泄漏，采样空气的成分可能会受到容器材料的影响。样品容器中目标VOC的回收率随蒸汽压的降低和辛醇/空气分配系数的增加而降低。1-丁醇和1-己醇在Nalophan（TM）容器中的回收率很高。因此，这些物质似乎适合研究协同气味效应。可以证明1-丁醇和1-己醇的混合物在感觉评估中没有明显的加和作用。这使基于单个物质评估的气味指导值概念的实际相关性产生疑问。

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