GB/T 210.2-2004 English PDF (GBT210.2-2004)

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GB/T 210.2-2004: Specification and determination methods of sodium carbonate for industrial use -- Part 2: Specification and determination methods
GB/T 210.2-2004
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.40
G 11
Replacing GB 210-1992
Specification and determination methods of sodium
carbonate for industrial use -
Part 2. Specification and determination methods
ISSUED ON. MARCH 15, 2004
IMPLEMENTED ON. OCTOBER 1, 2004
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Test methods ... 6
Appendix A (Informative) Technical differences between this Part and BS
6070.1981 and the corresponding causes ... 23
Appendix B (Informative) Contrast of the section numbers of this Part and BS
6070.1981 ... 25
Foreword
This national standard Specification and determination methods of sodium
carbonate for industrial use is divided into two parts.
— Part 1. Sodium carbonate for industrial use;
— Part 2. Specification and determination methods.
This Part is Part 2 of the Specification and determination methods of sodium
carbonate for industrial use.
This Part modifies and adopts the British Standard BS 6070.1981 Methods of
test for sodium carbonate for industrial use (EN); and it is redrafted according
to the British Standard BS 6070.1981 Methods of test for sodium carbonate for
industrial use.
Taking China’s national situation into consideration, this Part makes some
modifications when using the British Standard. The relevant technical
differences have been compiled into the text, and have been indicated via the
vertical single lines drawn in the margin positions of their involved clauses. The
list of these technical and structural differences and corresponding reasons
have been given in Appendixes A and B for reference.
This Part replaces the national standard GB 210-1992 Sodium carbonate for
industrial use along with GB 210.1.
Compared with GB 210-1992, the technical changes of this Part are as follows.
— LIST the method for determining water insoluble substances by using a
Gooch crucible covered with asbestos paper in parallel. USE the method
for determining water insoluble substances by using a Gooch crucible
covered with acid-washed asbestos for arbitration.
The Appendixes A and B of this Part are informative appendixes.
This Part was proposed by the original State Bureau of Petroleum and Chemical
Industries.
This Part shall be under the jurisdiction of the Subcommittee of Inorganic
Chemical Industry of the National Technical Committee for Standardization of
Chemistry (SAC/TC 63/SC1).
Drafting organizations of this Part. Tianjin Chemical Research and Design
Institute, Tianjin Soda Plant (now known as Tianjin Bohua Yongli Chemical
Industry Co., Ltd), Dahua Group Co., Ltd, Hangzhou Longshan Chemical Co.,
Specification and determination methods of sodium
carbonate for industrial use -
Part 2. Specification and determination methods
1 Scope
This Standard specifies the specification and determination methods of sodium
carbonate for industrial use.
This Standard is applicable to the sodium carbonate for industrial use
produced by using industrial salt or trona as raw material through Solvay
process, Hou’s process for soda manufacture or other methods. This product
is mainly used in the following industries. chemical industry, glass, metallurgy,
papermaking, printing and dyeing, synthetic detergents, petrochemical industry,
etc.
Molecular formula. Na2CO3
Relative molecular mass. 105.99 (according to the international relative atomic
mass in 1999)
2 Normative references
The provisions in the following documents become the provisions of this
Standard through reference in this Standard. For dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, parties who reach an agreement based on this
Standard are encouraged to study if the latest editions of these documents are
applicable. For undated references, the latest editions apply to this Standard.
GB/T 3049-1986 Chemical products for industrial use - General method for
determination of iron content - o-Phenanthroline spectrophotometric method
(neq ISO 6685.1982)
GB/T 3050-2000 Inorganic chemical products for industrial use - General
method for determination of chloride content - Potentiometric method
GB/T 3051-2000 Inorganic chemical products for industrial use - General
method for determination of chloride content - Mercurimetric method
GB/T 6682-1992 Water for analytical laboratory use - Specification and test
methods (neq ISO 3696.1987)
HG/T 3696.1 Inorganic chemical products - Preparations of standard
volumetric solutions for chemical analysis
HG/T 3696.2 Inorganic chemical products - Preparations of standard
solutions of impurity for chemical analysis
HG/T 3696.3 Inorganic chemical products - Preparations of reagent solutions
for chemical analysis
3 Test methods
3.1 Safety tips
Some of the reagents used in this test method are toxic or corrosive. Be
cautious during operations! If splashing on the skin, FLUSH immediately.
In severe cases, TREAT immediately.
3.2 General provisions
In the absence of other requirements specified, the reagents and water used in
this Standard refer to analytical reagents and Level III water specified in GB/T
6682-1992. In the absence of other requirements specified, the standard
volumetric solutions as well as the standard solutions, preparations and
products for impurity determination used in the test shall be prepared according
to the provisions of HG/T 3696.1 to HG/T 3696.3.
3.3 Determination of total alkali content
3.3.1 Method summary
USE bromocresol green-methyl red mixture as indicator. USE standard
hydrochloric acid volumetric solution for the titration of total alkali content.
3.3.2 Reagents
3.3.2.1 Standard hydrochloric acid volumetric solution. c(HCl) is 1 mol/L or so;
3.3.2.2 Bromocresol green-methyl red mixed indicator solution.
3.3.3 Analysis procedures
3.3.3.1 Determination of total alkali content (counted as wet basis)
3.4.1 Mercurimetric method
3.4.1.1 Method summary
Same as the method in the Chapter 2 of GB/T 3051-2000.
3.4.1.2 Reagents
3.4.1.2.1 Nitric acid solution. 1+1;
3.4.1.2.2 Nitric acid solution. 1+7;
3.4.1.2.3 Sodium hydroxide solution. 40 g/L;
3.4.1.2.4 Standard mercuric nitrate volumetric solution. c (1/2Hg(NO3)2 • H2O)
is 0.05 mol/L or so.
PREPARE and CALIBRATE according to the Section 4.9 of GB/T 3051-2000.
3.4.1.2.5 Bromophenol blue indicator solution. 1 g/L;
3.4.1.2.6 Phenylazoformic acid 2-phenylhydrazide indicator solution. 5 g/L.
3.4.1.3 Instrument
3.4.1.3.1 Burette. The division value is 0.02mL or 0.05mL.
3.4.1.4 Analysis procedures
3.4.1.4.1 Preparation of reference solution
ADD 40mL of water and 2 drops of bromophenol blue indicator solution in a
250mL conical flask. Dropwise ADD nitric acid solution (3.4.1.2.2), until the
solution just turns from blue to yellow. ADD excessive (2~3) drops. ADD 1mL of
phenylazoformic acid 2-phenylhydrazide indicator solution. USE standard
mercuric nitrate volumetric solution for titration, until the solution turns from
yellow to fuchsia. NOTE down the volume of consumed standard mercuric
nitrate volumetric solution. PREPARE this solution before using.
3.4.1.4.2 Determination of test sample...