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Investigated item	Odour concentration in ouE/m³ , determined by sensory measurement of odour concentration of an odour sample supplied in a sampling bag.
Identification	The odour sample bags were labelled individually. The label showed the identification of the bag. This identification is referenced within the results.
Method	The odour concentration measurements were performed according to the European Standard EN13725:2003 ‘Air quality – Determination of odour concentration by dynamic olfactometry’, and according to those parts as described in the internal procedure QD01: ‘Procedure for olfactometry based on EN13725:2003’. The odour perception characteristic of the panel within the presentation series for the samples was analogous to that for the butanol calibration. The forced-choice method of presentation was used and at least two rounds are presented to determine the panel threshold. Sample bags are manufactured from PET, Nalophane and are not re-used.
Measuring range	The dilution range of the olfactometer is 1:76000 to 1:8. The lower limit of detection is 30 ouE/m3. If the concentration of the odour sample exceeded the higher dilution factors the odour sample may have been pre-diluted. If samples are pre-diluted in the laboratory this is specified under the column Pre-dilution factor Z in Table 1.
Environment	The measurements were performed in an air- and odour conditioned room, at a temperature of T 25C and with a fluctuation of less than ±3°C. The CO2 concentration is 0.15%. The laboratory is stationary and permanent.
Measurement dates and times	The measuring dates and times are specified together with the results in Table 1.
Results	The measurement results are presented in Table 1 of this certificate.
Uncertainty	The confidence limits for a value x for one measurement according to EN13725, with a cover factor k = 2 are: x2.21-1 x x2.21. It is assumed that this uncertainty, based on verification with reference gases, is transferable to environmental samples. The most recent interlaboratory comparison result is A = 0.166.
Traceability	The measurements have been performed using standards for which the traceability to (inter)national standards has been demonstrated. The assessors are individually selected to comply with fixed criteria and are monitored in time to keep within the limits set. The results from the assessors are traceable to primary standards (PSM’s) of n-butanol in nitrogen.
Altrincham, 17 November, 2015,
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Table 1 Measurement results

Analysis file	Sample ID	Client Reference	Analysis result	Pre-dilution factor Z	Odour concentr-ation	Date and time of sampling	Date and time of analysis	Number of valid panel members	Number of valid ITE values	Remarks
[ouE.m-3]	[ouE.m-3]