YS/T 244.2-2008Chemical analysis methods of high purity aluminium. Part 2: Determination of silicon content by extraction-molybdenum blue photometric method (English PDF)

Foreword

YS/T 244 "Chemical analysis methods of high purity aluminum" is divided into nine sections.

--- Part 1. phenanthroline - thiocyanate spectrophotometric determination of iron content;

--- Part 2. molybdenum blue extraction and spectrophotometric determination of silicon content;

--- Part 3. Two-antipyrine DAM - spectrophotometric determination of titanium content thiocyanate;

--- Part 4. Butyl Rhodamine B spectrophotometric determination of gallium content;

--- Part 5. Determination of copper, zinc and lead content anodic stripping voltammetry;

--- Part 6. Catalytic manganese - sulfuric acid system through the determination of silver content;

--- Part 7. dithizone extraction and spectrophotometric determination of cadmium content;

--- Part 8. crystal violet extraction and spectrophotometric determination of indium content;

--- Part 9. Determination of impurities by inductively coupled plasma mass spectrometry.

This is Part 2.

The partial replacement of YS/T 244.2-1994 "Determination of silicon content of high purity aluminum for chemical analysis of molybdenum blue extraction." this part is YS/T 244.2-1994 revision. Compared with YS/T 244.2-1994, the main changes are as follows.

--- Reducing agent ascorbic acid increased;

--- Added "repeatability" clause;

--- Increase the "quality assurance and control" clause.

The non-ferrous metal part by the National Standardization Technical Committee and centralized.

This part of the Fushun Aluminum Co., Ltd., China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting.

This part of the Fushun Aluminum Co. drafted.

1 Scope

This section specifies the determination method of high purity silicon content.

This section applies to the determination of high purity silicon content. Measurement range. ~ 0.00010% 0.00080%.

2 Method summary

The sample is dissolved with sodium hydroxide, sulfuric acid, acidity 0.2mol/L ammonium molybdate is formed when silicon and silicon molybdenum heteropoly acid, and then increase the acidity to 3.6mol/L, with a reducing agent solution is reduced to silicon molybdenum blue to n-amyl alcohol extracted wavelength spectrophotometer measuring the absorbance at 800nm degree. High purity aluminum impurities present do not interfere with the determination.

3 Reagents

Reagent preparation and analysis of water are deionized water and then purified by distillation quartz distiller.

3.1 ethanol, pure class distinctions.

3.2 n-amyl alcohol.

3.3 sulfuric acid (1 + 1), pure class distinctions.

3.4 hydrochloric acid (1 + 3), pure class distinctions.

3.5 ammonium molybdate solution (100g/L) pure class distinctions. This storage is a solution in a polyethylene bottle.