ISO 304-1985 “Determinarea tensiunii superficiale a surfactantului prin tragere peliculă lichidă”

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ISO (Organizația Internațională pentru Standardizare) este o alianță globală a organismelor naționale de standardizare (organismele membre ISO). Elaborarea standardelor internaționale se realizează de obicei prin intermediul comitetelor tehnice ISO. Fiecare instituție membră interesată de un subiect pe care a fost înființat un comitet tehnic are dreptul de a fi reprezentată în respectivul comitet. Organizațiile internaționale guvernamentale și neguvernamentale care au legătură cu ISO sunt, de asemenea, implicate în această activitate.

Draft international standards adopted by technical committees are circulated to member bodies for approval before being accepted as international standards by the ISO Council. They are approved under the ISO process, which requires at least 75 per cent approval from voting member bodies.

Standardul internațional ISO 304 was developed by the Technical Committee ISO/TC91, Surfactants.

The second edition cancelled and replaced the first edition (ISO 304-1978), which was a minor revision.

Users should note that, unless otherwise noted, all international standards are revised from time to time, and unless otherwise noted, any reference herein to any other international standard is meant to be the latest version.

ISO 304-1985 “Determinarea tensiunii superficiale a surfactantului prin tragere peliculă lichidă”

Introducere
Surface tension is a basic property of liquids in general, especially surfactant aqueous solutions.

in orice caz, in the case of surfactant solutions, measurements of this property do not allow any assumptions to be made about its decontamination, umectare, spumând, emulsifying activity, etc. De fapt, no relationship can be established between the properties of the surfactant and the surface tension of the solution.

1 Scope and domain of application
This standard specifies a test method for determining the surface tension of surfactants and aqueous or organic solutions containing one or more surfactants by drawing liquid membranes.

It is also suitable for surface tension measurement of pure liquids or solutions other than those described above.

Notă – A number of methods have been established to determine surface tension, ca:

A) Method of drawing liquid film by plate, stirrup or ring:

b) Methods for measuring the rise of liquid in capillary tubes;

c) maximum ball pressure method;

d) falling weight method;

e) Drop or handless ball method;

f) suspension droplet method;

g) Dynamic method based on flow characteristic measurement;

h) Methods for studying waves generated in capillary jets.

The draw-based liquid film approach has significant advantages in terms of simple procedures and commercial availability of highly automated equipment.

2 Reference Materials
ISO 862, Surfactants — Vocabular.

ISO 2456, SurfactantsWater used as a test solvent.

Doar secțiunea de informații standard este publică. Pentru a vedea conținutul complet, trebuie să achiziționați standardul prin canalele oficiale.

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