Odor assessment includes standard practices for measuring odor parameters such as concentration, intensity, persistence, and character descriptors. Internationally accepted statistical concepts and methods used for odor assessment provide reliable analytical data. Odor parameters are routinely measured under controlled laboratory conditions by trained assessors (members of the sensory panel).
Environmental engineers, designers, industrial hygienists, researchers, and others use odor assessments in their work for forensic investigations, product development, product validation, and building material acceptability. Odor assessments are also used in indoor air quality studies.
The first step in odor evaluations is thresholds. Odor samples are evaluated and quantified to determine odor concentration (odor intensity) using a device called an olfactometer with an odor panel. These odors are evaluated in accordance with the standards of the American National Standards Institute (ANSI) and the American Society for Testing and Materials (ASTM). In particular, the internationally followed standard for olfactometry is “ASTM E679-91 Standard Practice for Determining Odor and Taste Thresholds by Forced Choice Increasing Concentration Series Limit Method”.
The odor persistence of a sample can be determined quantitatively. Persistence is a term used in conjunction with intensity. The perceived intensity of an odor varies with its concentration. However, the rate of change between intensity and concentration is not the same for all odors. This rate of change is called the odor persistence.
The dose-response function of an odorant is determined from measurements of the intensity of the odor sample at full strength and at several dilution levels above the threshold level. Values plotted as logarithms of intensity and dilution ratio represent the dose-response function. The slope indicates persistence.
Smell is the distance from which you can smell the perfume or the size the perfume's scent reaches and expresses the power of the perfume to spread in that place. Persistence is called the scent life and means how long the perfume stays on the skin and clothes.
The permanence of the scent depends on various factors. For example,
Fragrance longevity is essentially the amount of time that a scent remains perceptible on the user's skin. It is not an easy and straightforward time frame for all perfumes.
The longevity of a perfume begins in the earliest stages of oil development. The primary factor in how a perfume performs after application and why some perfumes linger on your skin aromatically longer than others is the ratio of the fragrance oil blend used. Citrus notes evaporate more quickly from the skin, while amber and musk notes significantly increase the longevity of a perfume. The blend of certain fragrance notes can increase longevity.
The second factor is the potential use of a fixative. A fixative is a base ingredient or blend used in perfumes to help the scent last longer on the skin. The essential oil in a blend can act as a fixative while contributing to the overall scent impression. Fragrance fixatives can also be safe synthetic materials that both enhance the first impression and increase longevity.
Among the numerous tests, measurements, analyses and evaluations our organization has carried out for businesses in various sectors, it also provides odor permanence testing services with its trained and expert staff and advanced technological equipment.
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