GB/T 6009-2014 English PDF (GBT6009-2014)

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GB/T 6009-2014: Anhydrous sodium sulfate for industrial use
GB/T 6009-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Replacing GB/T 6009-2003
Anhydrous sodium sulfate for industrial use
工业无水硫酸钠
ISSUED ON: JULY 08, 2014
IMPLEMENTED ON: DECEMBER 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Molecular formula and relative molecular mass ... 5 
4 Classification ... 5 
5 Requirements ... 5 
6 Test methods ... 6 
7 Inspection rules ... 22 
8 Markings and labels ... 23 
9 Packaging, transportation, storage ... 23 
Anhydrous sodium sulfate for industrial use
1 Scope
This standard specifies the classification, requirements, test methods,
inspection rules, marking, labeling, packaging, transportation, storage of
anhydrous sodium sulfate for industrial use.
This standard applies to anhydrous sodium sulfate for industrial use. This
product is mainly used as the industrial raw materials such as battery, optical
glass, printing-dyeing, synthetic detergent, vinylon, dye, ordinary glass, paper
industry, fiber production, inorganic salt, etc.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 191-2008 Packaging - Pictorial marking for handling of goods
GB/T 3049-2006 Chemical products for industrial use - General method for
determination of iron content - 1 10-Phenanthroline spectrophotometric
method
GB/T 3051-2000 Inorganic chemical products for industrial use - General
method for determination of chloride content - Mercurimetric method
GB/T 6678 General principles for sampling chemical products
GB/T 6682-2008 Water for analytical laboratory use - Specification and test
methods
GB/T 8170 Rules for rounding off for numerical values and expression and
judgement of limiting values
GB/T 23769-2009 Inorganic chemical products - General method for the
determination of pH values
GB/T 23774-2009 Inorganic chemical products - General method for
determination of whiteness
Use water to dissolve the sample and filter the insoluble matter. Under acidic
conditions, add cerium chloride to react with the sulfate ion in the test solution
to form barium sulfate precipitate. Filter it. Ash it. Burn it. Weigh it. Make
calculation.
6.3.1.2 Reagents
6.3.1.2.1 Hydrochloric acid solution: 1 + 1.
6.3.1.2.2 Barium chloride (BaCl2 • 2H2O) solution: 122 g/L.
6.3.1.2.3 Silver nitrate solution: 20 g/L.
6.3.1.3 Instruments
High-temperature furnace: The temperature can be controlled at 800 °C ± 20 °C.
6.3.1.4 Analytical procedures
6.3.1.4.1 Preparation of test solution
Weigh approximately 5 g of the specimen, accurate to 0.0002 g. Place it in a
250 mL beaker. Add 100 mL of water. Heat to dissolve it. Use a medium speed
quantitative filter paper to filter the solution into a 500 mL (V1) volumetric flask.
Use water to rinse it until there is no sulfate ions (tested by barium chloride
solution). Cool it. Use water to dilute it to the mark. Shake it uniformly.
6.3.1.4.2 Determination
Pipette 25 mL (V2) of test solution. Place it in a 500 mL beaker. Add 5 mL of
hydrochloric acid solution and 270 mL of water. Heat to slight boiling. Add
dropwise 10 mL of ruthenium chloride solution whilst stirring it. The addition
time is about 1.5 min. Continue stirring and keep slight boiling for 2 min ~ 3 min.
Cover the watch glass. Continue keeping slight boiling for 5 min. Then place
the beaker in the boiling water bath for thermal insulation for 2 h. Remove the
beaker. Cool it to room temperature. Use the slow-speed quantitative filter
paper to filter it. Use warm water to rinse the precipitate until there is no chloride
ion (take 5 mL of rinsing solution; add 5 mL of silver nitrate solution; mix it
uniformly; place it for 5 min; there is no turbidity). Transfer the precipitate
together with the filter paper into a porcelain crucible which had been burned at
800 °C ± 20 °C to a constant mass. Dry it on an electric furnace and ash it.
Place it in a high-temperature furnace. Burn it at 800 °C ± 20 °C until the mass
is constant.
6.3.1.5 Calculation of results
The sodium sulfate content is calculated based on the mass fraction w1 of
w3 - The exact value of the mass fraction of calcium and magnesium (in
terms of Mg) as measured in 6.5;
w4 - The exact value of the mass fraction of chloride (in terms of Cl) as
measured in 6.6;
w5 - The exact value of the mass fraction of iron (Fe) as measured in 6.7;
w6 - The exact value of the mass fraction of moisture as measured in 6.8;
w7 - The exact value of the mass fraction (calculated as H2SO4) or alkalinity
(calculated as Na2CO3) as measured in 6.11;
4.951 - The factor of converting magnesium (Mg) to magnesium sulfate
(MgSO4);
1.648 - The factor of converting chlorine (Cl) to sodium chloride (NaCl);
3.580 - The factor of converting iron (Fe) to ferric sulfate [Fe2(SO4)3].
6.4 Determination of water insoluble content
6.4.1 Instruments
6.4.1.1 Glass mortar: The filter plate has a pore size of 5 μm ~ 15 μm.
6.4.1.2 Electrothermal constant temperature drying oven: The temperature can
be controlled at 105 °C ± 2 °C.
6.4.2 Analytical procedures
Weight approximately 20 g of the specimen, accurate to 0.01 g. Place it in a
250 mL beaker. Add 100 mL of water. Heat to dissolve it. Use a clean and dry
suction filter bottle and a glass mortar that has been dried at 105 °C ± 2 °C to
a constant mass to filter it. Use water to rinse it until there is no sulfate ion. Use
barium chloride solution (see 6.3.1.2.2) for inspection. Place the glass mortar
in an electrothermal constant temperature drying oven. Dry it at 105 °C ± 2 °C
until the mass is constant.
After cooling the filtrate, transfer it into a 500 mL (V1) volumetric flask. Use water
to dilute it to the mark. Shake it uniformly. This solution is the test solution A.
Keep this solution for the determination by titration of calcium and magnesium
as well as the determination of chloride content.
6.4.3 Calculation of results
The water insoluble content is calculated based on the mass fraction w2 through
the formula (3):
6.5.1.2.6 Water: The grade II water which complies with the requirements of
GB/T 6682-2008.
6.5.1.3 Instruments
Flame atomic absorption spectrophotometer: It is equipped with calcium and
magnesium cathode hollow lamps.
6.5.1.4 Analytical procedures
6.5.1.4.1 Preparation of test solution
Weigh a certain amount of specimen (about 10 g for category-I superior
products; about 1 g for category-II products; about 0.5 g for category-III
products; about 0.3 g for category-III products), accurate to 0.01 g. Place it in a
250 mL beaker. Add 50 mL of water and 20 mL of nitric acid solution. Heat to
dissolve it. Continue boiling it for 5 min. After cooling it, transfer it all into a 500
mL (V1) volumetric flask. Use water to dilute it to the mark. Shake it uniformly.
Dry filter it. Prepare for use.
6.5.1.4.2 Drawing of working curve
Pipette 0.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, 10.00 mL of calcium and
magnesium standard solution into six 100 mL volumetric flasks. Add...