GB/T 1606-2008 English PDF (GBT1606-2008)

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GB/T 1606-2008: Sodium bicarbonate for industrial use
GB/T 1606-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Replacing GB/T 1606-1998
Sodium Bicarbonate for Industrial Use
工业碳酸氢钠
ISSUED ON: APRIL 1, 2008
IMPLEMENTED ON: SEPTEMBER 1, 2008
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 Molecular Formula, Molecular Mass ... 6
4 Classification ... 6
5 Requirements ... 6
6 Test Methods ... 7
7 Inspection Rules ... 18
8 Marking and Labeling ... 19
9 Packaging, Transportation and Storage ... 19
Appendix A (informative) Determination of Sodium Carbonate Content ... 20
Sodium Bicarbonate for Industrial Use
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking, labeling,
packaging, transportation and storage of sodium bicarbonate for industrial use.
This Standard is applicable to sodium bicarbonate for industrial use. The product is mainly used
in industries like cosmetics, daily chemicals, printing and dyeing, leather tanning, rubber and
metal surface treatment, etc.
2 Normative References
The clauses of the following documents become clauses of this Standard through the normative
references in this Standard. In terms of references with a specified date, all subsequent
amendments (excluding errata content) or revisions do not apply to this Standard. However, the
various parties that reach an agreement in accordance with this Standard are encouraged to
explore whether the latest versions of these documents are applicable. In terms of references
without a date, the latest versions apply to this Standard.
GB/T 191-2000 Packaging - Pictorial Marking for Handling of Goods (eqv ISO 780:1997)
GB/T 1250 Rules for Expression and Judgement of Limiting Values
GB/T 3049-2006 Chemical Products for Industrial Use - General Method for Determination of
Iron Content - 1,10-Phenanthroline Spectrophotometric Method (ISO 6685:1982, IDT)
GB/T 3051-2000 Inorganic Chemical Products for Industrial Use - General Method for
Determination of Chloride Content - Mercurimetric Method
GB/T 5009.74-2003 Method for Limit Test of Heavy Metals in Food Additives
GB/T 5009.76-2003 Determination of Arsenic in Food Additives
GB/T 6678 General Principles for Sampling Chemical Products
GB/T 6682-1992 Water for Analytical Laboratory Use - Specification and Test Methods (eqv
ISO 3696:1987)
GB/T 9724-2007 Chemical Reagent - General Rule for the Determination of pH
HG/T 3696.1 Inorganic Chemicals for Industrial Use - Preparations of Standard Volumetric
Solutions for Chemical Analysis
Sodium bicarbonate and sodium carbonate are strong alkali and weak acid salt. Hydrogen
carbonate and carbonate are hydrolyzed in water to generate quantitative hydroxide. Use
bromocresol green-methyl red as an indicator and use hydrochloric acid standard titration
solution to perform titration; determine the total alkali content.
6.4.2 Reagents
6.4.2.1 Hydrochloric acid standard titration solution: c (HCl)  1 mol/L;
6.4.2.2 Bromocresol green-methyl red indicator solution.
6.4.3 Analytical procedures
Weigh-take about 2.5 g of specimen, accurate to 0.0002 g; place it in a 250 mL conical flask,
and add 50 mL of water to dissolve it all. Dropwise add 10 drops of the bromocresol green-
methyl red indicator solution; use the hydrochloric acid standard titration solution to titrate it,
until the test solution turns from green to dark red, then, boil it for 2 min and cool to room
temperature. Use the hydrochloric acid standard titration solution to continue to perform
titration, until it turns dark red, which is the terminal point.
Meanwhile, conduct a blank test. The blank test shall be carried out in parallel with the
determination, and the same analytical procedures shall be adopted; take the same amounts of
all reagents (except the standard titration solution), but no specimen shall be added to the blank
test.
6.4.4 Result calculation
The total alkali content, which is calculated as the mass fraction w1 of sodium bicarbonate
(NaHCO3) and expressed in (%), shall be calculated in accordance with Formula (1):
Where,
V---the value of the volume of the hydrochloric acid standard titration solution consumed by
the titration test solution, expressed in (mL);
V0---the value of the volume of the hydrochloric acid standard titration solution consumed by
the blank test, expressed in (mL);
c---the exact value of the concentration of the hydrochloric acid standard titration solution,
expressed in (mol/L);
m---the value of the mass of the test portion, expressed in (g);
M---the value of the molar mass of sodium bicarbonate (NaHCO3), expressed in (g/mol) (M =
84.01).
6.6 Determination of pH Value
6.6.1 Instrument
6.6.1.1 pH meter: with an accuracy of 0.02 pH unit.
6.6.2 Analytical procedures
Weigh-take 1.00 g  0.01 g of specimen and place it in a 150 mL beaker. Add about 100 mL of
carbon dioxide-free water to dissolve the specimen. Within 10 min (starting from adding water),
determine it in accordance with the stipulations of GB/T 9724-2007.
6.7 Determination of Chloride Content
6.7.1 Mercurimetric method (arbitration method)
6.7.1.1 Method summary
Same as Chapter 3 of GB/T 3051-2000.
6.7.1.2 Reagents
Same as Chapter 4 of GB/T 3051-2000.
6.7.1.3 Instruments and equipment
Same as Chapter 5 of GB/T 3051-2000.
6.7.1.4 Analytical procedures
Weigh-take about 2 g of specimen, accurate to 0.01 g. Place it in a conical flask and add 40 mL
of water to dissolve it. Dropwise add 2 drops of bromophenol blue indicator solution; dropwise
add nitric acid solution to neutralize it, until it turns yellow. Then, dropwise add sodium
hydroxide solution, until it turns blue, then, use nitric acid solution to adjust it to just yellow,
and drop 2 ~ 3 drops in excess. Add 1 mL of diphenyl azo carbazide indicator solution and use
0.02 mol/L mercury nitrate standard titration solution to titrate it, until the solution turns from
yellow to purple, which is the terminal point.
Meanwhile, conduct a blank test. The blank test shall be carried out in parallel with the
determination, and the same analytical procedures shall be adopted; take the same amounts of
all reagents (except the standard titration solution), but no specimen shall be added to the blank
test.
Save the waste solution after titration and handle it in accordance with the requirements of
Appendix D in GB/T 3051-2000.
6.7.1.5 Result calculation
The chloride content, which is calculated as the mass fraction w3 of chlorine (Cl) and expressed
amount of water to dissolve it, then, transfer it all to a 100 mL volumetric flask. Use water to
dilute to the scale and shake it well. Use a transfer pipette to transfer-take 25 mL of the above-
mentioned test solution and place it in a 50 mL colorimetric tube; add 1 mL of 95% ethanol, 3
mL of nitric acid solution and 2 mL of silver nitrate solution; use water to dilute to the scale
and gently shake it. After letting it stand still for 10 min, compare it with the standard
turbidimetric solution under the black background, and the generated turbidity shall not be
deeper than that of the standard turbidimetric solution.
The standard turbidimetric solution is to transfer-take the chloride standard solution in
accordance with the follow...