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Glavni meni

ISO 4326:1980

Non-ionic surface active agents — Polyethoxylated derivatives — Determination of hydroxyl value — Acetic anhydride method
1. 3. 1980.

Опште информације

90.93     1. 11. 2024.

ISO

ISO/TC 91

Međunarodni standard

71.100.40  

francuski   engleski  

Kupovina

Objavljen

Jezik na kome želite da primite dokument.

Apstrakt

The hydroxyl group is esterified by acetic anhydride in pyridine solution. The excess of acetic anhydride is hydrolized with water. The acidity which appears during the esterification and the acetic acid formed during the hydrolysis are neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volume od sodium hydroxide solution used for the titration of the blank and of the test solution.

Životni ciklus

TRENUTNO

OBJAVLJEN
ISO 4326:1980
90.93 Odluka o potvrđivanju standarda
1. 11. 2024.

Nacionalna preuzimanja

SRPS ISO 4326:1992  
ISS

Nejonske površinski aktivne materije - Polietoksilovani derivati - Određivanje hidroksilnog broja - Metoda sa anhidridom sirćetne kiseline (identičan sa ISO 4326:1980)

90.93   Odluka o potvrđivanju standarda

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