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ISO 9388:1992

Nickel alloys — Determination of phosphorus content — Molybdenum blue molecular absorption spectrometric method

Publication date:   Aug 27, 1992

General information

90.93 Standard confirmed   Jun 5, 2020

ISO

ISO/TC 155 Nickel and nickel alloys

International Standard

77.120.40   Nickel, chromium and their alloys

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Scope

Phosphorus content can be determined in the range of 0,001 % (m/m) to 0,025 % (m/m). Cr(III) and silica cause interference which is eliminated. The principle is dissolution of a test portion in a mixture of nitric and hydrochloric acids, fuming with sulfuric acid, oxidation of Cr(III) to Cr(VI), precipitation of Fe(III) phosphate and redissolution of the precipitate, addition of boric, tartaric and sulfamic acids, formation and extraction of molybdophosphoric acid, reduction of the heteropoly acid to molybdenum blue and back-extraction into an aqueous phase, measurement of the absorbance of the aqueous solution at 700 nm.

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PUBLISHED
ISO 9388:1992
90.93 Standard confirmed
Jun 5, 2020