International Standard
ISO 9388:1992
Nickel alloys — Determination of phosphorus content — Molybdenum blue molecular absorption spectrometric method
Reference number
ISO 9388:1992
ISO 9388:1992
Edition 1
1992-08
1992-08
© ISO 2024
International Standard
p
ISO 9388:1992
17080
Published
(Edition 1, 1992)
This standard 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
-
Status: PublishedPublication date: 1992-08Stage: International Standard confirmed [90.93]
-
Edition: 1Number of pages: 6
-
Technical Committee :ISO/TC 155ICS :77.120.40
- RSS updates
Life cycle
Got a question?
Check out our FAQs
Customer care
+41 22 749 08 88
Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)