Standard

ISO 937:1978

Tilbaketrukket

Merknad: Denne standarden har en ny utgave: ISO 937:2023

Forhåndsvisning

Rettelser og tillegg kjøpes separat.

Språk
Tjenester

Omfang

The method consists in digesting of a test portion with concentrated sulphuric acid, using copper(II) sulphate as a catalyst, to convert organic nitrogen to ammonia ions. Then alkalisation, distillation of the liberated ammonia into an excess of boric acid solution, titration with hydrochloric acid to determine the ammonia bound by the boric acid, and calculation of nitrogen content of the sample from the amount of ammonia produced.

Dokumentinformasjon

  • Standard fra ISO
  • Publisert:
  • Tilbaketrukket:
  • Utgave: 1
  • Versjon: 1
  • Varetype: IS
  • ICS 67.120.10
  • ISO TC ISO/TC 34/SC 6

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