ISO 11400:2021
Nickel, ferronickels and nickel alloys — Determination of phosphorus content — Phosphovanadomolybdate spectrophotometric method
This document specifies a spectrophotometric method for the determination of the phosphorus content in nickel, ferronickels and nickel alloys between 0,000 5 % (by mass) and 0,05 % (by mass).
Arsenic, chromium, hafnium, niobium, silicon, tantalum, titanium and tungsten interfere, but the interferences can be avoided by complexation or volatilization (for chromium). The lowest phosphorus content [0,000 5 % (by mass)] can only be reached in samples with low contents of these interfering elements.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and sample preparation
8 Procedure
8.1 Test portion
8.2 Blank test
8.3 Determination
8.3.1 Preparation of the test solution
8.3.2 Removal of chromium
8.3.3 Complexation
8.3.4 Colour development and extraction
8.3.5 Spectrophotometric measurement
8.4 Establishment of the calibration curve
8.5 Check test
9 Expression of results
9.1 Calculation
9.2 Precision
9.2.1 Laboratory tests
9.2.2 Statistical analysis
10 Test report
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and sample preparation
8 Procedure
8.1 Test portion
8.2 Blank test
8.3 Determination
8.3.1 Preparation of the test solution
8.3.2 Removal of chromium
8.3.3 Complexation
8.3.4 Colour development and extraction
8.3.5 Spectrophotometric measurement
8.4 Establishment of the calibration curve
8.5 Check test
9 Expression of results
9.1 Calculation
9.2 Precision
9.2.1 Laboratory tests
9.2.2 Statistical analysis
10 Test report
Bibliography