Method SM 2150B

Threshold Odor Test

This method is for the determination of odor from drinking water.  The sample is diluted with odor-free water until the least definitely perceptible odor is achieved.  The comparisons are made at aa temperature of 60°C.  The odor at the threshold point is expressed quantitatively by the threshold odor number (TON).

There is no absolute threshold odor concentration, because of inherent variation in individual olfactory capability.  A given person varies in sensitivity over time. Day-to-day and within-day differences occur.  Furthermore, responses vary as a result of the characteristic, as well as concentration, of odorant.  This threshold method is applicable to samples ranging from nearly odorless natural waters to industrial wastes with threshold numbers in the thousands.


(Standard Methods)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   24 hours from sample collection to analysis.
Preservatives:   Cool samples to 4°C.
Required Preps:   500mL Glass bottle with Teflon-lined lid
Collection Method:   Grab sampling
Analytical Methodology:   Manual

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.