ISO 5522:1981
ISO 5522:1981
Status : Published (Under review)
This standard was last reviewed and confirmed in 2022. Therefore this version remains current.
Format Language
std 1 61 PDF
std 2 61 Paper
  • CHF61
Convert Swiss francs (CHF) to your currency


The method consists in acidifying and heating a test portion, entraining, in a current of nitrogen, the gas liberated, absorbing and oxidizing the gas by bubbling it through a neutral, dilute hydrogen peroxide solution, then determining the sulphuric acid thus formed using standard volumetric sodium hydroxide solution. Verification of the determination is described in the annexes A and B, respectively.

General information

  •  : Published
     : 1981-09
    : International Standard confirmed [90.93]
  •  : 1
     : 7
  • ISO/TC 34/SC 3
  • RSS updates

Read sample 

Preview this standard in our Online Browsing Plateform (OBP)

Life cycle

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)