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GB/T 23940-2021 English PDF (GBT23940-2021)
GB/T 23940-2021 English PDF (GBT23940-2021)
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GB/T 23940-2021: Analytical methods of persulfate products for industrial use
GB/T 23940-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.01
CCS G 10
Replacing GB/T 23940-2009
Analytical methods of persulfate products for industrial use
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 General provisions ... 5
5 Determination of persulfate content and active oxygen content ... 5
6 Determination of pH ... 6
7 Determination of iron content ... 7
8 Determination of chloride content ... 8
9 Determination of moisture ... 9
10 Determination of manganese content ... 10
11 Determination of heavy metal content ... 11
12 Determination of ammonium salt content ... 12
13 Determination of ignition residue content ... 13
Analytical methods of persulfate products for industrial use
Warming: Some of the reagents used in this document are corrosive, and careful
handling is required! If splashed on the skin or eyes, rinse with water immediately;
if it is serious, seek medical attention immediately. Personnel using this document
shall have practical experience in formal laboratory work. This document does not
address all possible security issues. It is the responsibility of the user to take
appropriate safety and health measures and to ensure compliance with the
conditions which are set by the relevant national regulations.
1 Scope
This document specifies the general requirements for the analysis methods of persulfate
products for industrial use, the analysis methods of persulfate content and active oxygen
content, pH, iron content, chloride content, moisture, manganese content, heavy metal
content, ammonium salt content, and ignition residue content.
This document applies to persulfate products for industrial use, including sodium
persulfate for industrial use, potassium persulfate for industrial use, ammonium
persulfate for industrial use, etc.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 3049-2006, Chemical products for industrial use - General method for
determination of iron content - 1,10-Phenanthroline spectrophotometric method
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 23769-2009, Inorganic chemical products - General method for the
determination of pH values
HG/T 3696.1, Inorganic chemicals for industrial use - Preparations of standard and
reagent solutions for chemical analysis - Part 1: Preparations of standard volumetric
solutions
HG/T 3696.2, Inorganic chemicals for industrial use - Preparations of standard and
reagent solutions for chemical analysis - Part 2: Preparations of standard solutions
for impurity
HG/T 3696.3, Inorganic chemicals for industrial use - Preparations of standard and
reagent solutions for chemical analysis - Part 3: Preparations of reagent solutions
3 Terms and definitions
No terms and definitions need to be defined in this document.
4 General provisions
The reagents and water used in this document refer to analytical reagents and grade-3
water specified in GB/T 6682-2008, unless other requirements are specified. The
standard titration solutions, impurity standard solutions, preparations and products used
in the test shall be prepared according to the regulations of HG/T 3696.1, HG/T 3696.2
and HG/T 3696.3 unless other requirements are specified.
5 Determination of persulfate content and active oxygen
content
5.1 Principle
Potassium iodide reacts with persulfate to generate free iodine. In a weakly acidic
solution, use starch as an indicator and use sodium thiosulfate standard titration solution
for titration.
5.2 Reagents or materials
5.2.1 Potassium iodide.
5.2.2 Glacial acetic acid solution: 1+2.
5.2.3 Sodium thiosulfate standard titration solution: c(Na2S2O3) ≈ 0.1 mol/L.
5.2.4 Starch indicator solution: 10 g/L (the use period is about two weeks).
5.3 Test steps
Weigh about 0.3 g of the sample, accurate to 0.000 2 g; place it in a 250 mL iodine flask.
Add 30 mL of water to dissolve it; add 4 g of potassium iodide; cover the bottle; shake
well; seal it with water. Place in the dark for 30 min; add 2 mL of glacial acetic acid
solution and 25 mL of water; use sodium thiosulfate standard titration solution for
Carbon dioxide-free water.
6.2 Instruments and equipment
Acidity meter: accuracy 0.02 pH unit. Equipped with glass electrodes, saturated
calomel electrodes or combination electrodes.
6.3 Test steps
Weigh 5.00 g ± 0.01 g of the sample; place it in a 250 mL beaker; add 100 mL of carbon
dioxide-free water at about 25 °C; after the sample is completely dissolved, follow the
steps specified in 8.3 of GB/T 23769-2009.
7 Determination of iron content
7.1 Principle
Same as Chapter 3 of GB/T 3049-2006.
7.2 Reagents or materials
Same as Chapter 4 of GB/T 3049-2006.
7.3 Instruments and equipment
7.3.1 Porcelain evaporating dish: volume 50 mL.
7.3.2 Constant temperature water bath.
7.3.3 Spectrophotometer: equipped with a 4 cm cuvette.
7.4 Test steps
7.4.1 Drawing of the standard curve
According to the steps specified in 6.3 of GB/T 3049-2006, use a 4 cm cuvette to draw
a standard curve with an iron content of 10 μg ~ 100 μg.
7.4.2 Preparation of test solution A
Weigh an appropriate amount of sample (10 g for sodium persulfate and potassium
persulfate, and 20 g for ammonium persulfate), accurate to 0.01 g; place in a porcelain
evaporating dish; add a small amount of water to moisten; cover with a watch glass;
decompose by heating on a constant temperature water bath and evaporate to dryness.
Slowly heat on the electric furnace until a large amount of white smoke begins to escape;
cool down. Use water to dissolve the residue; transfer it all to a 100 mL volumetric
flask; use water to dilute to the mark; shake well. This solution is the test solution A,
which is used for the determination of iron content and heavy metal content.
8.2.4 Chloride standard solution: 1 mL of solution contains 0.010 mg of chlorine (Cl).
Use a pipette to pipette 1 mL of chloride standard solution prepared according to the
requirements of HG/T 3696.2; place it in a 100 mL volumetric flask; use water to dilute
to the mark; shake well. Formulate the solution when needed.
8.3 Test steps
Weigh an appropriate amount of the sample (0.50 g ± 0.01 g for sodium persulfate and
potassium persulfate, and 2.00 g ± 0.01 g for ammonium persulfate); place it in a 50
mL beaker; add an appropriate amount of water to dissolve it. Transfer all the solution
to a 50 mL colorimetric tube; add 1 mL of 95% ethanol, 1 mL of nitric acid solution
and 2 mL of silver nitrate solution; use water to dilute to the mark; shake gently; let it
stand for 10 min; compare it with the standard turbidimetric solution under a black
background.
The standard turbidimetric solution is based on the chloride content specified in the
product standard. Use a pipette to pipette the specified amount of chloride standard
solution; trea...
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GB/T 23940-2021: Analytical methods of persulfate products for industrial use
GB/T 23940-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.01
CCS G 10
Replacing GB/T 23940-2009
Analytical methods of persulfate products for industrial use
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 General provisions ... 5
5 Determination of persulfate content and active oxygen content ... 5
6 Determination of pH ... 6
7 Determination of iron content ... 7
8 Determination of chloride content ... 8
9 Determination of moisture ... 9
10 Determination of manganese content ... 10
11 Determination of heavy metal content ... 11
12 Determination of ammonium salt content ... 12
13 Determination of ignition residue content ... 13
Analytical methods of persulfate products for industrial use
Warming: Some of the reagents used in this document are corrosive, and careful
handling is required! If splashed on the skin or eyes, rinse with water immediately;
if it is serious, seek medical attention immediately. Personnel using this document
shall have practical experience in formal laboratory work. This document does not
address all possible security issues. It is the responsibility of the user to take
appropriate safety and health measures and to ensure compliance with the
conditions which are set by the relevant national regulations.
1 Scope
This document specifies the general requirements for the analysis methods of persulfate
products for industrial use, the analysis methods of persulfate content and active oxygen
content, pH, iron content, chloride content, moisture, manganese content, heavy metal
content, ammonium salt content, and ignition residue content.
This document applies to persulfate products for industrial use, including sodium
persulfate for industrial use, potassium persulfate for industrial use, ammonium
persulfate for industrial use, etc.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 3049-2006, Chemical products for industrial use - General method for
determination of iron content - 1,10-Phenanthroline spectrophotometric method
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 23769-2009, Inorganic chemical products - General method for the
determination of pH values
HG/T 3696.1, Inorganic chemicals for industrial use - Preparations of standard and
reagent solutions for chemical analysis - Part 1: Preparations of standard volumetric
solutions
HG/T 3696.2, Inorganic chemicals for industrial use - Preparations of standard and
reagent solutions for chemical analysis - Part 2: Preparations of standard solutions
for impurity
HG/T 3696.3, Inorganic chemicals for industrial use - Preparations of standard and
reagent solutions for chemical analysis - Part 3: Preparations of reagent solutions
3 Terms and definitions
No terms and definitions need to be defined in this document.
4 General provisions
The reagents and water used in this document refer to analytical reagents and grade-3
water specified in GB/T 6682-2008, unless other requirements are specified. The
standard titration solutions, impurity standard solutions, preparations and products used
in the test shall be prepared according to the regulations of HG/T 3696.1, HG/T 3696.2
and HG/T 3696.3 unless other requirements are specified.
5 Determination of persulfate content and active oxygen
content
5.1 Principle
Potassium iodide reacts with persulfate to generate free iodine. In a weakly acidic
solution, use starch as an indicator and use sodium thiosulfate standard titration solution
for titration.
5.2 Reagents or materials
5.2.1 Potassium iodide.
5.2.2 Glacial acetic acid solution: 1+2.
5.2.3 Sodium thiosulfate standard titration solution: c(Na2S2O3) ≈ 0.1 mol/L.
5.2.4 Starch indicator solution: 10 g/L (the use period is about two weeks).
5.3 Test steps
Weigh about 0.3 g of the sample, accurate to 0.000 2 g; place it in a 250 mL iodine flask.
Add 30 mL of water to dissolve it; add 4 g of potassium iodide; cover the bottle; shake
well; seal it with water. Place in the dark for 30 min; add 2 mL of glacial acetic acid
solution and 25 mL of water; use sodium thiosulfate standard titration solution for
Carbon dioxide-free water.
6.2 Instruments and equipment
Acidity meter: accuracy 0.02 pH unit. Equipped with glass electrodes, saturated
calomel electrodes or combination electrodes.
6.3 Test steps
Weigh 5.00 g ± 0.01 g of the sample; place it in a 250 mL beaker; add 100 mL of carbon
dioxide-free water at about 25 °C; after the sample is completely dissolved, follow the
steps specified in 8.3 of GB/T 23769-2009.
7 Determination of iron content
7.1 Principle
Same as Chapter 3 of GB/T 3049-2006.
7.2 Reagents or materials
Same as Chapter 4 of GB/T 3049-2006.
7.3 Instruments and equipment
7.3.1 Porcelain evaporating dish: volume 50 mL.
7.3.2 Constant temperature water bath.
7.3.3 Spectrophotometer: equipped with a 4 cm cuvette.
7.4 Test steps
7.4.1 Drawing of the standard curve
According to the steps specified in 6.3 of GB/T 3049-2006, use a 4 cm cuvette to draw
a standard curve with an iron content of 10 μg ~ 100 μg.
7.4.2 Preparation of test solution A
Weigh an appropriate amount of sample (10 g for sodium persulfate and potassium
persulfate, and 20 g for ammonium persulfate), accurate to 0.01 g; place in a porcelain
evaporating dish; add a small amount of water to moisten; cover with a watch glass;
decompose by heating on a constant temperature water bath and evaporate to dryness.
Slowly heat on the electric furnace until a large amount of white smoke begins to escape;
cool down. Use water to dissolve the residue; transfer it all to a 100 mL volumetric
flask; use water to dilute to the mark; shake well. This solution is the test solution A,
which is used for the determination of iron content and heavy metal content.
8.2.4 Chloride standard solution: 1 mL of solution contains 0.010 mg of chlorine (Cl).
Use a pipette to pipette 1 mL of chloride standard solution prepared according to the
requirements of HG/T 3696.2; place it in a 100 mL volumetric flask; use water to dilute
to the mark; shake well. Formulate the solution when needed.
8.3 Test steps
Weigh an appropriate amount of the sample (0.50 g ± 0.01 g for sodium persulfate and
potassium persulfate, and 2.00 g ± 0.01 g for ammonium persulfate); place it in a 50
mL beaker; add an appropriate amount of water to dissolve it. Transfer all the solution
to a 50 mL colorimetric tube; add 1 mL of 95% ethanol, 1 mL of nitric acid solution
and 2 mL of silver nitrate solution; use water to dilute to the mark; shake gently; let it
stand for 10 min; compare it with the standard turbidimetric solution under a black
background.
The standard turbidimetric solution is based on the chloride content specified in the
product standard. Use a pipette to pipette the specified amount of chloride standard
solution; trea...
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