Ferroboron - Determination of boron content - Alkalimelry method
WARNING - Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health measures and to ensure compliance with any national regulatory conditions.
1 Scope
This document specifies the method for the determination of boron content in ferroboron by alkalimelry titration.
This document is applicable to the determination of boron content in ferroboron. The determination range (mass fraction) is 3.00% ~ 26.00%.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4010 Ferroalloys sampling and preparation of samples for chemical analysis
GB/T 6379.1 Accuracy (trueness and precision) of measurement methods and results - Part 1: General principles and definitions
GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 12806 Laboratory glassware - One-mark volumetric flasks
GB/T 12808 Laboratory glassware - One mark pipettes
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Principle
The sample is melted and decomposed with anhydrous sodium carbonate or sodium potassium carbonate-sodium peroxide, then leached with water, and subjected to dry filtering to separate iron, manganese, nickel, etc. Take a portion of the filtrate and add citric acid to mask aluminium. Adjust the test solution pH to 6.9 according to the indication of the acidity meter, add mannitol, and titrate with sodium hydroxide standard solution pH to 6.9, indicating the endpoint.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Sampling and sample preparation
8 Analytical procedures
9 Calculation and representation of result
10 Precision
11 Test report
Annex A (Normative) Flow chart of procedure for acceptance of sample analysis results
Annex B (Informative) Original data of precision test
