NTA 9065, the Dutch standard on dynamic olfactometry accepted for public consultation

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NTA9065 drafts   The Dutch standard NTA 9065 on Odour Measurement and Calculation was first published in 2012. Now 8 years later, a revision of this standard is ready for public comments until the 1st of June 2020.  The text provides requirements and instructions for the standard procedure for conducting odour testing in the Netherlands and it has been divided in 2 parts: NTA 9065 Part 1 dealing with planning, execution and reporting of odour investigations and NTA 9065 Part 2 dealing with sampling and analysis.

   The NTA 9065:2012 has had a short life. However, due to new European developments in the field of odour testing, and the reformulation of the requirements with regard to odour sampling and odour analysis for the purpose of accreditation, the Dutch Standardization body decided to start a procedure to revise it. After an intensive work of all committee members, the draft is ready for comments. These are some of the important points in the NTA 9065.

  In order to better distinguish which part of the NTA falls under accreditation, it was decided to split the NTA into two parts:

  • Air quality - Odour measurements - Part 1: Planning, execution and reporting of odour investigations:
  • Air quality - Odour measurements - Part 2: Sampling and analysis:

Part 1 describes the design, execution and reporting of odour testing, describing a preferred method from which it is possible to deviate in specific situations.Part 2 describes the requirements for odour sampling and odour analyses, where the main text contains the methods that may fall under accreditation and the appendices contain alternative methods.

  After a quick overview to the draft of the part 2 of this standard, these are some relevant news for odour managers in the Netherlands:

  1. At least three samples must be taken per source and the flow rate must be measured also three times.
  2. Sampling time to withdraw a sample is at least 30 min.
  3. When changing the source to be sampled, the sampling train must be effectively cleaned or replaced by demonstrably clean parts.
  4. Field blanks should be taken to check if the sampling train is odour-free.
  5. Maximum allowed odour concentration of the field blank is 80 ouE/m3
  6.  Sampling hoods are no longer valid to sample active area sources. Either you cover everything up and sample, or you cover partially at least 50% of the total area.
  7.  Only the forced choice method is allowed for analysis
  8. A minimum of 6 panel members are required for olfactometric analysis.
  9. A factor 2 is taken as permissible measurement uncertainty.
  10. Labs are required participate in proficiency tests annually.
  11. Design criteria for Wind tunnel are specified in an informative annex. As this annex is informative, no specific design for wind tunnels is mandatory.

 An important aspect to consider is that following the points 1 to 4, total time to sample a source will be over 4 hours per source considering setting equipments, flushing bags, 30 min sampling time, taking triplicates, measuring three times flow, cleaning or replacing equipment and getting a field blank.

We have asked an odour expert to detail in a text some of the relevant changes in part 1.  Very important concepts such as the odour load are introduced in this standard, and they need a more detailed explanation. There are many more relevant aspects of part 1 for odour managers, but this post is already too long.

   The Netherlands have a very active group of odour experts that have been working for years in standardization. Quite often they set criteria that are later incorporated in other standards such as the EN 13725. That is why, this standard is relevant for odour managers.

  If you know a bit of Dutch or you use an online translation tool, it is possible to access the draft and comment it by registering here until 1 June 2020. 


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