BS EN ISO 21078-1:2008

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Preparation of the test sample
5 Number of determinations
6 Determination of boron(III) oxide by alkaline titrimetry
7 Determination of boron(III) oxide by azomethine H
   absorption spectrophotometry
8 Determination of boron(III) oxide by curcumin absorption
   spectrophotometry
9 Determination of boron(III) oxide by inductively coupled
   plasma atomic emission spectrometry (ICP-AES)
10 Expression of test results
11 Test report
Annex A (informative) - Interlaboratory test results

Describes methods of determining boron(3) oxide in refractory products and raw materials, in mass fractions of 0,01% or greater.

This part of ISO21078 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: alkaline titrimetry, which is applied to samples containing more than 0,5%by mass of boron(III) oxide; azomethine H absorption spectrophotometry, which is applied to samples containing from 0,01%by mass to 2,5%by mass of boron(III) oxide; 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; 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. NOTE1 The method can be extended to 30%boron(III) oxide using modified oxidic fluxes. NOTE2 Interlaboratory test results for this part of ISO21078 are given in AnnexA.