YS/T 575.5-2007 PDF English
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Methods for chemical analysis of bauxite. Part 5: Determination of iron oxide content. Orthophenanthroline photometric method
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| YS/T 575.5-2006 | English | 199 |
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Methods for chemical analysis of bauxite. Determination of iron oxide content. Orthophenanthroline photometric method
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YS/T 575.5-2007: Methods for chemical analysis of bauxite. Part 5: Determination of iron oxide content. Orthophenanthroline 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/YST575.5-2007
NON-FERROUS METAL INDUSTRY STANDARD
ICS 71.100.10
Q 52
Replacing YS/T 575.5-2006
Methods for Chemical Analysis of Bauxite -
Part 5.Determination of Iron Oxide Content -
Orthophenanthroline 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 Analytical Procedures... 7
7 Calculation of Analysis Results... 8
8 Precision... 8
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 5.
This Part replaces YS/T 575.5-2006 (formerly GB/T 3257.5-1999).
This Part revises YS/T 575.5-2006.Compared with YS/T 575.5-2006, this Part has the
major changes as follows.
--- Change the concentrations of orthophenanthroline solution and hydroxylamine
hydrochloride solution;
--- Supplement the provisions of color-development temperature and time;
--- Unify the drying temperature of the specimen to be 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, and Li Xiong.
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 575.5-2006 (formerly GB/T 3257.5-1999).
Methods for Chemical Analysis of Bauxite -
Part 5.Determination of Iron Oxide Content -
Orthophenanthroline Photometric Method
1 Scope
This Part specifies the determination of ferric oxide content in the bauxite.
This Part is applicable to the determination of ferric oxide content in the bauxite; the
determination range. ≤5.00%.
2 Method Principle
The specimen is melted by alkali, leached by hydrochloric acid; and the ferric iron is
reduced to ferrous iron with hydroxylamine hydrochloride under appropriate acidity. In
an acetate buffer medium, ferrous iron and orthophenanthroline form a colored
complex. The absorbance is measured at a wavelength of 510 nm.
3 Reagents
3.1 Sodium hydroxide.
3.2 Hydrochloric acid (1+1).
3.3 hydroxylamine hydrochloride solution (5%).
3.4 orthophenanthroline solution (0.5%).
3.7 Ferric oxide standard storage solution
Take 0.5000g of ferric oxide (99.99%), which was previously burned at 600°C for 2h,
into a 250mL beaker; add a little water to moisten; and add 40mL of hydrochloric acid
(3.2) along the cup wall. Cover the dish; heat until completely dissolved; and cool.
Transfer to a 1000 mL volumetric flask; wash the beaker with water; and dilute to the
scale with water; mix well. 1mL of this solution contained 0.5mg of ferric oxide.
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;
6 Analytical 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
of ferric oxide standard solution (3.8) into a group of 100mL volumetric flasks. Operate
by following the analysis procedure 6.4.1.Take the reagent blank as the reference;
measure its absorbance. Draw working curve by taking the amount of ferric oxide as
the abscissa, and absorbance as the ordinate.
7 Calculation of Analysis Results
Calculate the mass fraction (%) of ferric oxide 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. When the process
is out of control, it shall find out the reason.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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