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YS/T 575.3-2007 PDF English

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YS/T 575.3-2007: Methods for chemical analysis of bauxite. Part 3: Determination of silicon dioxide content. Molybdenum blue photometric method
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YS/T 575.3: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
YS/T 575.3-2007100 Add to Cart Auto, 9 seconds. Methods for chemical analysis of bauxite. Part 3: Determination of silicon dioxide content. Molybdenum blue photometric method  
YS/T 575.3-2006199 Add to Cart 2 days Methods for chemical analysis of bauxite. Determination of silicon dioxide content. Molybdenum blue photometric method Obsolete

Similar standards

GB/T 8719   YB/T 042   YS/T 575.7   

YS/T 575.3-2007: Methods for chemical analysis of bauxite. Part 3: Determination of silicon dioxide content. Molybdenum blue photometric method


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YST575.3-2007
NON-FERROUS METAL INDUSTRY STANDARD ICS 71.100.10 Q 52 Replacing YS/T 575.3-2006 Methods for Chemical Analysis of Bauxite - Part 3.Determination of Silicon Dioxide Content - Molybdenum Blue Photometric Method Issued on. NOVEMBER 14, 2007 Implemented on. MAY 01, 2008 Issued by. National Development and Reform Commission

Table of Contents

Foreword... 3 1 Scope... 6 2 Method Principle... 6 3 Reagents... 6 4 Apparatus... 7 5 Specimen... 7 6 Analysis Procedures... 7 7 Calculation of Analysis Results... 8 8 Precision... 9 9 Quality Assurance and Control... 9

Foreword

YS/T 575-2007 Methods for Chemical Analysis of Bauxite is a modification to YS/T 575-2006 (formerly GB/T 3257-1999). It has 24 parts in total. --- Part 1.Determination of aluminum oxide content - EDTA titrimetric method; --- Part 2.Determination of silicon dioxide content - Gravimetric-molybdenum blue photometric method; --- Part 3.Determination of silicon dioxide content - Molybdenum blue photometric method; --- Part 4.Determination of iron oxide content - Potassium titrimetric method; --- Part 5.Determination of iron oxide content - Orthophenanthroline photometric method; --- Part 6.Determination of titanium dioxide content - Diantipyrylmethane photometric method; --- Part 7.Determination of calcium oxide content - Flame atomic absorption spectrophotometric method; --- Part 8.Determination of magnesium oxide content - Flame atomic absorption spectrophotometric method; --- Part 9.Determination of potassium oxide, sodium oxide content - Flame atomic absorption spectrophotometric method; --- Part 10.Determination of manganese oxide content - Flame atomic absorption spectrophotometric method; --- Part 11.Determination of chromium oxide content - Flame atomic absorption spectrophotometric method; --- Part 12.Determination of vanadium pentoxide content - N-benzoyl-N- phenylhydroxylamine photometric method; --- Part 13.Determination of zinc content - Flame atomic absorption spectrophotometric method; --- Part 14.Determination the total content of rare earth oxide Tribromo-arsenazo photometric method; --- Part 15.Determination of gallium oxide content - Rhodamine B-extraction photometric method; --- Part 16.Determination of phosphorus pentoxide content - Molybdenum blue spectrophotometric method; --- Part 17.Determination of sulfur content - Direct combustion-iodometric method; --- Part 18.Determination of total carbon content - Non-aqueous titrimetric method after combustion; --- Part 19.Determination of the loss on ignition - Gravimetric method; --- Part 20.Preparation of pre-dried sample; --- Part 21.Determination of organic carbon content titrimetric method; --- Part 22.Determination of hydroscopic moisture in analytical samples - Gravimetric method; --- Part 23.Determination of element contents X-ray fluorescence spectrometric method; --- Part 24.Determination of carbon content and sulfur content - Infrared absorption method. This Part is Part 3. This Part replaces YS/T 575.3-2006 (formerly GB/T 3257.3-1999). This Part revises YS/T 575.3-2006.Compared with YS/T 575.3-2006, this Part has the major changes as follows. --- Adjust the concentrations of ammonium molybdate solution and sulfuric acid- oxalic acid-ferrous ammonium sulfate solution; --- Improve the melting method of silicon dioxide standard solution; --- Specify the storage time of the sulfuric acid-oxalic acid-ferrous ammonium sulfate mixed solution; --- Specify the storage time after adding acid-oxalic acid-ferrous ammonium sulfate mixed solution; --- Changed the concentration and amount of added hydrochloric acid when drawing the working curve; --- Modify the wavelength of the silicon dioxide; --- Unify the drying temperature of the sample to 110°C±5°C; --- Add the precision. This Part was proposed by and under the jurisdiction of National Technical Committee on Non-ferrous Metals of Standardization Administration of China. Chief drafting organization of this Part. China Aluminum Corporation Zhengzhou Research Institute. Drafting organization of this Part. China Aluminum Corporation Guizhou Branch. Chief drafting staffs of this Part. Wang Baosheng, Lin Xingming, and Li Yunliang. This Part shall be interpreted by National Technical Committee on Non-ferrous Metals of Standardization Administration of China. The historical edition replaced by this Standard is as follows. --- YS/T 575.3-2006 (formerly GB/T 3257.3-1999). Methods for Chemical Analysis of Bauxite - Part 3.Determination of Silicon Dioxide Content - Molybdenum Blue Photometric Method

1 Scope

This Part specifies the determination of silicon dioxide content in bauxite. This Part is applicable to the determination of silicon dioxide content in bauxite; the measurement range. ≤15.00%.

2 Method Principle

The specimen was melted with alkali, leached with hydrochloric acid; add ammonium molybdate to form silicon molybdenum heteropoly acid; and then reduced to molybdenum blue by ferrous iron. Use a spectrophotometer to measure the absorbance at a wavelength of 700 nm.

3 Reagents

3.1 Sodium hydroxide. 3.2 Hydrochloric acid (1+1). 3.3 Hydrochloric acid (1+99). 3.4 Hydrochloric acid (1+3). 3.5 Ammonium molybdate solution (100g/L). Filter it, if necessary; if there are more precipitates, then re-prepare the solution. 3.7 Silicon dioxide standard solution. take 0.1000g of silicon dioxide (99.99%), which was burned at 1000°C for 2h and cooled in advance, into platinum crucible; add 3g of anhydrous sodium carbonate and stir evenly.

4 Apparatus

Spectrophotometer.

5 Specimen

Grind the specimen by a mortar and pass through a 74µm sieve; dry the ground specimen at 110°C±5°C for 2h; place it into a desiccator; cool off to the room temperature for later-use.

6 Analysis Procedures

6.1 Specimen Take 0.25g of specimen (5); accurate to 0.0001g. 6.2 Measurement times The same specimen shall be measured for twice; and take their average value. 6.3 Blank test Take the blank test with the specimen. 6.4 Measurement 6.5 Drawing of working curve Separately take 0.00mL, 0.50mL, 1.00mL, 2.00mL, 3.00mL, 4.00mL, 5.00mL, 6.00mL, 7.00mL, 8.00mL of silicon dioxide (3.7) into 100mL volumetric flasks. Supplement each flask with 2.5mL of hydrochloric acid (3.4); and then add water to a volume of 50mL. Operate by following the analysis procedure 6.4.3.Take the reagent blank as the reference; measure its absorbance. Draw working curve by taking the amount of silicon dioxide as the abscissa, and absorbance as the ordinate.

7 Calculation of Analysis Results

Calculate the mass fraction (%) of silicon dioxide as per the following Formula.

8 Precision

8.1 Repeatability Measured values of two independent test results are obtained under repeatable conditions. Within the range of average values given below, the absolute values of these two test results do not exceed the repeatability limit (r). 8.2 Tolerance The difference between laboratory analysis results shall not be greater than the tolerances listed in Table 1.

9 Quality Assurance and Control

In analysis, use standard sample or control sample to verify. Or, use standard sample or control sample to verify the analysis method at least once a year. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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