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Related Concept Videos

Olfaction01:25

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
Titration of a Weak Base with a Strong Acid01:20

Titration of a Weak Base with a Strong Acid

The titration curve of a weak base like ammonia with a strong acid like hydrochloric acid is the mirror image of the titration curve of a weak acid with a strong base.
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...

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Related Experiment Video

Updated: Jul 19, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
06:27

Fast and Accurate Exhaled Breath Ammonia Measurement

Published on: June 11, 2014

Odor and irritation thresholds for ammonia: a comparison between static and dynamic olfactometry.

Monique A M Smeets1, Patricia J Bulsing, Sanneke van Rooden

  • 1Department of Clinical and Health Psychology, Utrecht University, P.O. Box 80.140, 3508 TC Utrecht, the Netherlands. m.a.m.smeets@fss.uu.nl

Chemical Senses
|September 28, 2006
PubMed
Summary

Dynamic olfactometry shows higher reliability for measuring ammonia odor and irritation thresholds compared to static methods. Both methods provide comparable results, but dynamic olfactometry is more consistent for odor assessments.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Sensory Science

Background:

  • Odor assessment is crucial for environmental regulations and emissions control.
  • Standardized methods are needed for reliable odor threshold determination.
  • Olfactometry, including static and dynamic techniques, is used for these measurements.

Purpose of the Study:

  • To compare the test-retest reliability and comparability of static and dynamic olfactometry for ammonia.
  • To evaluate dynamic olfactometry against static methods for odor and irritation threshold determination.

Main Methods:

  • Ammonia vapor odor detection thresholds (ODTs) and lateralization thresholds (LTs) were measured twice within two weeks for 24 females.
  • Both static and dynamic olfactometry methods were employed.
  • Data were analyzed for significant differences and test-retest reliability (correlation coefficients).

Main Results:

  • No significant differences were found in mean ODTs (2.6 ppm) or LTs between static and dynamic methods (P=0.07 for LTs).
  • Dynamic olfactometry demonstrated higher test-retest reliability for both ODTs (r=0.61) and LTs (r=0.86) compared to static olfactometry (r=0.14 for ODTs, r=0.45 for LTs).

Conclusions:

  • Dynamic olfactometry offers superior test-retest reliability for ammonia odor and irritation threshold measurements.
  • While comparable, the choice of method depends on psychometric, practical, and economic factors.