Odor Threshold Measurement by Dynamic Olfactometry: Significant Operational Variables

Dravnieks, Andrew; Jarke, Frank H.

doi:10.1080/00022470.1980.10465182

Cited by 44 publications

(18 citation statements)

References 5 publications

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“…Earlier work by Andrew Dravnieks had already led to concern over the wide variability of olfactometry results. The underlying causes were identified as early as 1980, in a paper (Dravnieks & Jarke 1980) that listed all the major issues that were later addressed in EN13725.…”

Section: Proficiency Testing For Olfactometrymentioning

confidence: 99%

Proficiency testing as the key element in implementing EN13275 olfactometry

Harreveld¹,

Mannebeck²,

Maxeiner³

2009

Water Science and Technology

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The technical standard for dynamic olfactometry EN13725:2003 is now widely applied in testing of odours for environmental management purposes. Many laboratories working in this field apply QA/QC systems according to ISO17025 and are accredited under international accreditation, e.g. European Accreditation and NATA (Australia). One of the key elements of the EN13725 standard is the requirement to attain defined levels of statistical performance parameters, in particular Precision under repeatability conditions r and Accuracy A. For the reference odour n-butanol laboratories can establish these performance characteristics in-house, through internal QA/QC measurements. However, the real proof of the pudding is to demonstrate compliance with the requirements in externally organised blind proficiency testing. Proficiency testing for olfactometry has been used since the mid 1980s in the Netherlands and Germany. Currently international proficiency tests are organised by private firm Olfatec, under EN ISO/IEC 17020:2004 accreditation. In 2007 the most recent test was held, with 29 laboratories participating in the extended proficiency test using n-butanol. Of the participating laboratories 12 fully complied with the statistical performance criteria of EN13725. This result confirms that the EN13725 performance criteria are attainable in practice. It also shows that the majority of laboratories claiming to work according to EN13725 actually fail to do so on the key issue of the performance characteristics, a key element of the EN13725 standard. Even more worrying is that among the laboratories that fail to attain the required performance, many are accredited under ISO17025. Of 36 accredited laboratories for olfactometry in Europe only 12 have demonstrated compliance in 2007. This situation may create a false sense of security among users of the data produced, trusting that they can apply uncertainties according to EN13725 while in fact the uncertainty can be larger. It is therefore very important that corrective actions are implemented, and that the accreditation organisations monitor the implementation and also ensure that all laboratories claiming to work according to EN13725 under ISO17025 accreditation actually are able to attain the minimum criteria for precision and accuracy in successive proficiency tests. For users of olfactometry results it must be absolutely clear that a laboratory working according to EN13725 under ISO17025 accreditation will deliver results with a defined and satisfactory uncertainty. Such laboratories must be able to consistently pass proficiency tests for olfactometry. Accreditation bodies are the key guardians of this reasonable expectation..

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Section: Proficiency Testing For Olfactometrymentioning

confidence: 99%

Proficiency testing as the key element in implementing EN13275 olfactometry

Harreveld¹,

Mannebeck²,

Maxeiner³

2009

Water Science and Technology

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“…A sensory test using an air dilution method has been adopted recently by researchers as a method for identifying the cause of odor in wide open spaces. The odor threshold of indoor dust was measured by using a triangle odor bag method in order to determine the threshold concentration of the odor [1,4,6,[8][9][10][11][12][13]. Table 1 details the procedure for the air dilution sensory test method in Korea [1][2][3].…”

Section: Measurement Of Odor Threshold and Removal Of Stenchmentioning

confidence: 99%

Analysis and removal of the stench emitted from indoor dust

Kim

Jung

Sunwoo

et al. 2010

Korean J. Chem. Eng.

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The offensive odor produced from indoor dust accumulated inside a vacuum cleaner is quite unpleasant to the user. In this study, the odor of dust samples prepared under various conditions was examined using an olfactory method that employs the human sense of smell. In addition, the odorous compounds were analyzed by GC-MS. The odor intensity of the dust collected inside the vacuum cleaner increased in proportion to not only the humidity and temperature of the dust, but also to the cleaning period of the container where indoor dust was accumulated. GC/MS confirmed aldehydes to be the main odorous compounds. The dilution ratio at which the stench of the indoor dust was not detected was determined by using the triangle odor bag method.

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“…Plotted as a straight line on a log-log scale, the result is a linear equation specific for each odor sample. Figure 3 is an example of an odor persistency graph (Dose-Response Graph) [Dravnieks 1980]. The odorant concentration (Dose), expressed as the log of the dilution ratio, and the odor intensity (Response), expressed as the log of n-butanol PPM, produces the log-log plot with negative slope.…”

Section: Odor Persistencymentioning

confidence: 99%

Odor Testing Biosolids for Decision Making

McGinley¹,

McGinley²

2002

proc water environ fed

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The measurement of odors from wastewater treatment facilities is usually a requirement for compliance monitoring, planning, site expansion, and review of operational practices. These odor measurements are often focused on the "front end" of the facility, i.e. head works, primaries, and aeration processes. Sometimes attention is also placed on digesters and dewatering processes. However, the odor of the biosolids material is often overlooked as a parameter in decision-making at the wastewater treatment facility.

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Odor Threshold Measurement by Dynamic Olfactometry: Significant Operational Variables

Cited by 44 publications

References 5 publications

Proficiency testing as the key element in implementing EN13275 olfactometry

Proficiency testing as the key element in implementing EN13275 olfactometry

Analysis and removal of the stench emitted from indoor dust

Odor Testing Biosolids for Decision Making

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