GB/T 223.62-1988: Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content

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Scope

In 0.65~1.63mol/l nitric acid medium, phosphorus and ammonium molybdate generate
phosphorus-molybdenum heteropoly acid, which is extracted by butyl acetate; use
stannous chloride to reduce and back-tract the phosphorus-molybdenum heteropoly
acid into aqueous phase; then measure the absorbance at the wavelength of 680nm.
The extraction solution contains the following amounts of elements like 2.5µg of
zirconium, 20µg of arsenic, 25µg of niobium, tantalum, 50µg of titanium, 500µg of
cerium, 1.5mg of tungsten, 2mg of steel, 3mg of cobalt, 5mg of chromium, aluminum,
and 50mg of nickel; which shall not interfere with the determination.
When the above limits are exceeded, the arsenic shall be removed by hydrochloric
acid, and hydrobromic acid; vanadium shall be reduced by ferrous; zirconium shall be
covered by hydrofluoric acid; after oxidizing into high price, the chromium shall be
removed by hydrochloric acid; in the EDTA ammoniacal solution, the tungsten shall
take beryllium as carrier, and precipitate the phosphorus; niobium, titanium, zirconium,
tantalum shall use copper and iron reagents, and chloroform to extract and remove.

Basic Data

Standard ID	GB/T 223.62-1988 (GB/T223.62-1988)
Description (Translated English)	Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H11
Classification of International Standard	77.08
Word Count Estimation	5,574
Date of Issue	2/5/1988
Date of Implementation	2/1/1989
Older Standard (superseded by this standard)	GB 223.3-1981
Issuing agency(ies)	National Bureau of Standards
Summary	This standard applies to pig iron, iron, carbon steel, alloy steel, high temperature alloys, precision determination of phosphorus content of the alloy. Measurement range 0. 001% to 0. 05%.