Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 409 - PROCESSING FACILITIES › Appendix 096-409-A - PREPARATION OF ODOR INTENSITY REFERENCING SCALE[1]

Current through 2024-29, July 17, 2024
This document describes the preparation of a 5-point odor
				  intensity referencing scale in general conformance with the static-scale method
				  outlined in ASTM Standard E544 - 10 "Standard Practices for Referencing
				  Suprathreshold Odor Intensity," ASTM International, West Conshohocken, PA,
				  2010, DOI: 10.1520/E0544-10,
www.astm.org
. This document
				  is not intended to address user health and safety practices associated with the
				  preparation of the odor intensity referencing scale. The appropriate health and
				  safety resources should be consulted, and recommended guidelines followed,
				  during scale preparation.
The scale is prepared with the reference odorant n-butanol
				  (n-BuOH) in accordance with the concentrations specified in Table 1. Supporting
				  rationale for the selection of n-butanol as the reference odorant is summarized
				  in Appendix X1 of ASTM E544.
Table 1: 5-Point Odor Intensity Referencing Scale
Level
n-butanol Concentration in Water (ppm)
1
150
2
300
3
600
4
1200
5
2400
The scale ranges from 1 to 5. Level 1 consists of 150 parts
				  per million (ppm) of n-butanol in distilled water. Subsequent levels (Levels 2
				  through 5) increase by a factor of 2 based on a volume to volume basis.
Level 1 - Jar 1: 150 ppm
				  n-BuOH
Using a 1 milliliter (mL) pipet, measure 150 microliters
				  (µL) of n-BuOH and add to 1,000 milliliter (mL) volumetric flask. Add
				  distilled water to the 1,000 mL mark. Replace top and shake to mix. Use
				  approximately 200 mL of the solution for Jar 1.
Level 2 - Jar 2: 300 ppm
				  n-BuOH
Using a 1 mL pipet, measure 300 µL of n-BuOH and add to
				  1,000 mL volumetric flask. Add distilled water to the 1,000 mL mark. Replace
				  top and shake to mix. Use approximately 200 mL of the solution for Jar
				  2.
Level 3 - Jar 3: 600 ppm
				  n-BuOH
Using a 1 mL pipet, measure 600 µL of n-BuOH and add to
				  1,000 mL volumetric flask. Add distilled water to the 1,000 mL mark. Replace
				  top and shake to mix. Use approximately 200 mL of the solution for Jar
				  3.
Level 4 - Jar 4: 1200 ppm
				  n-BuOH
Using a 1 mL pipet measure 1 mL of n-BuOH and add to 1,000 mL
				  volumetric flask; next using a 1 mL pipet measure 200 µL of n-BuOH and
				  add to the 1,000 mL volumetric flask for a total of 1200 µL of n-BuOH.
				  Add distilled water to the 1,000 mL mark. Replace top and shake to mix. Use
				  approximately 200 mL of the solution for Jar 4.
Level 5 - Jar 5: 2400 ppm
				  n-BuOH
Using a 2 mL pipet measure 2 mL of n-BuOH and add to 1,000 mL
				  volumetric flask; next using a 1 mL pipet measure 400 µL of n-BuOH and
				  add to the 1,000 mL volumetric flask for a total of 2400 µL of n-BuOH.
				  Add distilled water to the 1,000 mL mark. Replace top and shake to mix. Use
				  approximately 200 mL of the solution for Jar 5.
1Adapted from Tech Environmental,
				  Odor Intensity Referencing Scale, Preparation of Samples for Static-Scale
				  Method.