GB/T 13747.5-2019Methods for chemical analysis of zirconium and zirconium alloys - Part 5: Determination of aluminium content - Chronic azurol-S-tetradrcylpyridine chloride spectrophotometry (English PDF)

Foreword

GB/T 13747 Methods for Chemical Analysis of Zirconium and Zirconium Alloys is divided into 27 parts:

---Part 1: Determination of Tin Content - Potassium Iodate Titration and Phenylfluorone-polyethylene Glycoloctyl Phenyl Ether Spectrophotometry;

---Part 2: Determination of Iron Content - 1,10-phenanthroline Spectrophotometric Method;

---Part 3: Determination of Nickel Content - Dimethylglyoxime Spectrophotometric Method;

---Part 4: Determination of Chromium Content - Diphenylcarbazide Spectrophotometric Method;

---Part 5: Determination of Aluminum Content - Chrome Azurol-S- tetradecylpyridine Chloride Spectrophotometry;

---Part 6: Determination of Copper Content - 2,9-Dimethyl-1,10-phenanthroline Spectrophotometry;

---Part 7: Determination of Manganese Content - Potassium Periodate Spectrophotometric Method;

---Part 8: Determination of Cobalt Content - Nitroso-R-salt Spectrophotometry;

---Part 9: Determination of Magnesium Content - Flame Absorption Spectrometric Method;

---Part 10: Determination of Tungsten Content - Thiocyanate Spectrophotometric Method;

---Part 11: Determination of Molybdenum Content - Thiocyanate Spectrophotometry;

---Part 12: Determination of Silicon Content - Molybdenum Blue Spectrophotometric Method;

---Part 13: Determination of Lead Content - Polarography;

1 Scope

GB/T 13747.5-2019 is the Chinese national standard on methods for chemical analysis of zirconium and zirconium alloys - part 5: determination of aluminium content - chronic azurol-s-tetradrcylpyridine chloride spectrophotometry, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 4 June 2019 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 May 2020. Classification: ICS 77.120.99, CCS H14. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Part of GB/T 13747 stipulates the determination method of aluminum content in zirconium and zirconium alloys. This Part is applicable to the determination of aluminum content in zirconium sponge, zirconium and zirconium alloys. The range of determination is: 0.0025% ~ 0.10%.

2 Principle

Use sulfuric acid and ammonium sulfate to dissolve specimen. Use N-benzoyl-N- phenylhydroxylamine trichloromethane solution to extract and separate the main element zirconium, and interference elements: hafnium, iron and titanium. After the separation, use o-phenanthroline and ascorbic acid to mask the residual iron. In acetic acid-sodium acetate medium (pH 5.8), aluminum and chronic azurol-S- tetradecylpyridine chloride form colored complex. At the wavelength of 630 nm, use a spectrophotometer to measure its absorbance. If the sample contains a small amount of uranium and thorium, sodium carbonate solution may be added during color- developing, so as to eliminate the influence.

3 Reagents

Unless it is otherwise stipulated, the analysis shall merely adopt reagents that are confirmed to be analytically pure and secondary laboratory water.

3.1 Ammonium sulfate (excellent grade of purity).