YS/T 575.21-2020 PDF English
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YS/T 575.21-2020 | English | 140 |
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Methods for chemical analysis of bauxite - Part 21: Determination of organic carbon content
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YS/T 575.21-2007 | English | 160 |
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Methods for chemical analysis of bauxite. Part 21: Determination of organic carbon content. Titrimetric method
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YS/T 575.21-2006 | English | 239 |
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Methods for chemical analysis of bauxite. Determination of organic carbon content. Titrimetric method
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YS/T 575.21-2020: Methods for chemical analysis of bauxite - Part 21: Determination of organic carbon content ---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/YST575.21-2020
YS
NONFERROUS METALS INDUSTRY STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
ICS 71.100.10
H 30
Replacing YS/T 575.21-2007
Methods for chemical analysis of bauxite - Part 21.
Determination of organic carbon content
Issued on. DECEMBER 9, 2020
Implemented on. APRIL 1, 2021
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
1 Scope... 6
2 Titration... 6
3 Infrared absorption method... 11
4 Test report... 14
Foreword
YS/T 575 Methods for chemical analysis of bauxite is divided into 29 parts.
-- Part 1.Determination of aluminium 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 - Dichromate 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 and 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.Methods for chemical analysis of bauxite - Part 12.Determination of
vanadium pentoxide content - N-benzoy-N-phenythyroxy lamine photometric
method;
-- Part 13.Determination of zinc content - Flame atomic absorption
spectrophotometric method;
-- Part 14.Determination of rare earth oxide content;
-- 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 loss on ignition - Gravimetric method;
-- Part 20.Preparation of pre-dried sample;
-- Part 21.Determination of organic carbon content;
-- Part 22.Determination of hydroscopic moisture - Gravimetric method;
-- Part 23.Determination of element contents - X-ray fluorescence spectrometry
method;
-- Part 24.Determination of carbon content and sulfur content - Infrared absorption
method;
-- Part 25.Determination of sulfur content - Coulometric titration method;
-- Part 26.Determination of sulphate content - Barium sulphate gravimetric method;
-- Part 27.Determination of element contents - Inductively coupled plasma atomic
emission spectrometric method;
-- Part 28.Determination of lithium oxide content - Flame atomic absorption
spectrophotometric method;
-- Part 29.Determination of available alumina and reactive silica.
This part is Part 21 of YS/T 575.
This part was drafted according to the rules given in GB/T 1.1-2009.
This part replaces YS/T 575.21-2007 Methods for chemical analysis of bauxite - Part
21.Determination of organic carbon content - Titrimetric method. Compared with
YS/T 575.21-2007, in addition to editorial modifications, the main technical changes
of this part are as follows.
-- The requirements for reagent purity and test water are added (see 2.2);
-- The description of the preparation of sodium oxalate standard solution is
modified (see 2.2.4; see 3.4 of the 2007 edition);
-- The test steps are modified (see 2.5; see Chapter 6 of the 2007 edition);
-- The calculation formula is modified (see 2.6; see Chapter 7 of the 2007 edition);
-- The repeatability limit is modified (see 2.7.1; see 8.1 of the 2007 edition);
-- The infrared absorption method is added (see Chapter 3).
This part was proposed by and is under the jurisdiction of the National Technical
Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC
243).
Drafting organizations of this part. CHALCO Shandong Co., Ltd., CHINALCO
Zhengzhou Nonferrous Metals Research Institute Co., Ltd., and China Aluminum
Mining Co., Ltd.
Main drafters of this part. Tian Rui, Cao Jianjun, Shao Jing, Zhou Bo, Shi Lei, Xue
Ning, Ai Zhen, Nian Lina, Wang Xiaoyan and Liu Wei.
The previous versions of the standards replaced by this part are as follows.
-- GB/T 3257.23-1999, YS/T 575.21-2006, YS/T 575.21-2007.
Methods for chemical analysis of bauxite - Part 21.
Determination of organic carbon content
1 Scope
This part specifies the method for determining the organic carbon content in bauxite by
titration and infrared absorption.
This part is applicable to the determination of organic carbon content in bauxite.
Determination range. 0.010%~1.00%.
The infrared absorption method is used as the arbitration test method.
2 Titration
2.1 Method summary
The sample is boiled with phosphoric acid to decompose carbonate, and organic carbon
is oxidized to carbon dioxide with potassium persulfate by using silver sulfate as a
catalyst; thymolphthalein is used as an indicator, and ethanol-ethanolamine-potassium
hydroxide standard titration solution is used for titration to calculate the mass fraction
of organic carbon.
2.2 Reagents
Unless otherwise stated, only reagents confirmed to be of analytical grade and
laboratory grade II water are used in the analyses.
2.2.1 Silver sulfate.
2.2.2 Phosphoric acid (1+1).
2.2.6 Ethanol-ethanolamine-potassium hydroxide standard titration solution.
2.3 Measurement device
The schematic diagram of the measurement device is shown in Figure 1.
2.5 Analysis steps
2.5.1 Test portion
Weigh the specimen according to Table 1, accurate to 0.0001 g.
2.5.2 Parallel experiments
Perform two experiments in parallel and take the average value.
2.5.3 Blank test
Carry out a blank test along with the specimen test.
2.5.4 Determination
2.5.4.4 Transfer 20 mL of saturated potassium persulfate solution (2.2.3) to the
separatory funnel, heat the three-necked flask until the solution boils for 20 minutes,
and add all of the saturated potassium persulfate solution (2.2.3) to the three-necked
flask in several times (2 mL~3 mL each time) within the time. After stopping the heating,
continue to introduce the air for 20 minutes. The following operations are the same as
those in 2.5.4.3, and record the volume of the consumed ethanol-ethanolamine-
potassium hydroxide standard titration solution (2.2.6).
Mass fraction wTOC Mass of specimen m
2.6 Calculation of analysis results
The organic carbon content is expressed as the mass fraction of organic carbon wTOC,
calculated according to formula (2).
2.7 Precision
2.7.1 Repeatability
The measured values obtained from two independent test results under repeatability
conditions are within the average value range given below; the absolute difference
between the two test results does not exceed the repeatability limit (r), and the
probability of exceeding the repeatability limit (r) does not exceed 5%. The
repeatability limit (r) is obtained by linear interpolation or extrapolation method
according to the data in Table 2.
3 Infrared absorption method
3.1 Method summary
The carbon in the specimen is divided into organic carbon and inorganic carbon. Under
the high temperature and catalyst, the carbon is fully burned and converted into CO2.
Inorganic carbon reacts with acid at a certain temperature and converts into CO2, while
organic carbon does not react.
3.2 Reagents
Unless otherwise stated, only reagents of confirmed guaranteed grade and laboratory
grade II water are used in the analyses.
3.3 Instruments and equipment
3.4 Specimens
Grind the specimen to pass through a standard sieve with an aperture of 75 μm, dry it
in an oven at 110 °C±5 °C for 2 hours, place it in a desiccator, and cool it to room
temperature for later use.
3.5 Analysis steps
3.5.1 Test portion
Weigh two specimens (3.4), each with a mass of 0.40 g, accurate to 0.0001 g. The mass
of the test portion used for total carbon determination is recorded as m0, and the mass
of the test portion used for inorganic carbon determination is recorded as m'0.
3.5.5 Drawing of working curve
3.5.5.1 Weigh 0, 12.51 mg, 25.02 mg, 37.53 mg, and 50.04 mg of glucose (3.2.1) and
place them in a set of sample boats (3.3.2). Proceed as in 3.5.4.3.
3.5.5.2 Weigh 0, 22.08 mg, 44.16 mg, 66.24 mg, and 88.32 mg of sodium carbonate
(3.2.2) and place them in a set of sample boats (3.3.2). Weigh 0, 17.50 mg, 35.00 mg,
52.50 mg, and 70.01 mg of sodium bicarbonate (3.2.3) and place them in the sample
boats containing sodium carbonate, respectively. Proceed as in 3.5.4.4.
3.5.5.3 Draw a working curve with carbon content as the abscissa and peak area as the
ordinate.
3.6 Calculation of analysis results
The organic carbon content is expressed as the mass fraction of organic carbon wTOC
and calculated according to formula (3).
3.7 Precision
3.7.1 Repeatability
The measured values obtained from two independent test results under repeatability
conditions are within the average value range given below; the absolute difference
between the two test results does not exceed the repeatability limit (r), and the
probability of exceeding the repeatability limit (r) does not exceed 5%. The
repeatability limit (r) is obtained by linear interpolation or extrapolation method
according to the data in Table 4.
4 Test report
The test report shall at least include the following contents.
...... Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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