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