Reference number
ISO 9388:1992
ISO 9388:1992
© ISO 2024
International Standard
ISO 9388:1992
Nickel alloys — Determination of phosphorus content — Molybdenum blue molecular absorption spectrometric method
Edition 1
1992-08
1992-08
ISO 9388:1992
17080
Published
(Edition 1, 1992)
This publication was last reviewed and confirmed in 2020.
Therefore this version remains current.
Abstract
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.
General information
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Status: PublishedPublication date: 1992-08Stage: International Standard confirmed [90.93]
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Edition: 1Number of pages: 6
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Technical Committee :ISO/TC 155ICS :77.120.40
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