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EVS-EN ISO 21078-1:2008

Determination of boron(III) oxide in refractory products - Part 1: Determination of total boric oxide in oxidic materials for ceramics, glass and glazes

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Kehtiv alates 07.03.2008
Alusdokumendid
ISO 21078-1:2008; EN ISO 21078-1:2008
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Standardi ajalugu

Staatus
Kuupäev
Tüüp
Nimetus
07.03.2008
Põhitekst
This part of ISO 21078 specifies methods of determining boron(III) oxide in refractory products and raw materials, in mass fractions of 0,01 % or greater. It is applicable to the determination of total boron(III) oxide in oxidic materials for ceramics, glass and glazes. The determination of boron(III) oxide is carried out using one of the following four methods: a) alkaline titrimetry, which is applied to samples containing more than 0,5 % by mass of boron(III) oxide; b) azomethine H absorption spectrophotometry, which is applied to samples containing from 0,01 % by mass to 2,5 % by mass of boron(III) oxide; c) curcumin absorption spectrophotometry (rothocyanine method), which is applied to samples containing from 0,01 % by mass to 1,0 % by mass of boron(III) oxide; d) inductively coupled plasma atomic emission spectrometry (ICP-AES), which is applied to samples containing from 0,01 % by mass to 15 % by mass of boron(III) oxide.
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