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GB/T 223.49-1994Methods for chemical analysis of iron, steel and alloy--Extraction separation-chlorophosphonazo mA spectro-photometric method for the determination of the total rare earth content (English PDF)

钢铁及合金化学分析方法萃取分离-偶氮氯膦mA分光光度法测定稀土总量

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

September 26, 1994

Implementation date

June 1, 1995

Scope

GB/T 223.49-1994 is the English-translated version of 钢铁及合金化学分析方法萃取分离-偶氮氯膦mA分光光度法测定稀土总量.

GB/T 223.49-1994 is the Chinese standard "Methods for chemical analysis of iron, steel and alloy--Extraction separation-chlorophosphonazo mA spectro-photometric method for the determination of the total rare earth content".

Its scope clause reads: This Standard specifies the PMBP - extraction separation - chlorophosphonazo mA spectrophotometric method for the determination of the total rare earth content.

This standard is applicable to determination of total rare earth content in carbon steel, alloy steel, high temperature alloy and precision alloy. Determination range: 0.0010%~0.20%. Its clauses include subject content and application scope; principle.

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Document preview — GB/T 223.49-1994

National Standard of the People's Republic of China

ICS: 77.080
Classification: H 11

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Subject Content and Application Scope
2 Principle
3 Reagent
4 Analytical Procedures
5 Calculation of Analysis Results
6 Precision
Appendix A Source Data of Precision Test (Additional)

1 Subject Content and Application Scope

This Standard specifies the PMBP - extraction separation - chlorophosphonazo mA spectrophotometric method for the determination of the total rare earth content.

This standard is applicable to determination of total rare earth content in carbon steel, alloy steel, high temperature alloy and precision alloy. Determination range: 0.0010%~0.20%.

2 Principle

Where pH is about 2, extraction separation of iron shall be conducted with acetylacetone - trichloromethane. Where pH is 5.5, with the existence of ammonium thiocyanate and sulfosalicylic acid, PMBP-benzene is applied to extract rare earth to be separated from other coexisting elements. Back extraction is applied with diluted hydrochloric acid. Chlorophosphonago mA and rare earth generate blue coordination compound, and measure the absorbance at the wavelength of 670 nm at spectrophotometer.

Take the color development curve of gadolinium with a given amount of oxalic acid and Zn-EDTA as the working curve to determine the total rare earth content.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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