GB/T 23937-2020_English: PDF (GB/T23937-2020)
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Sodium hydrosulfide for industrial use
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[GB/T 23937-2009] Sodium hydrosulfide for industrial use
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| Standard ID | GB/T 23937-2020 (GB/T23937-2020) | | Description (Translated English) | Sodium hydrosulfide for industrial use | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G12 | | Classification of International Standard | 71.060.50 | | Word Count Estimation | 9,915 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-10-01 | | Older Standard (superseded by this standard) | GB/T 23937-2009 | | Drafting Organization | Shandong Yifeng Biochemical Environmental Co., Ltd., Dongying Sanxie Chemical Co., Ltd., Shantou Bozhongcheng Clean Energy Co., Ltd., Tangshan Fengshi Chemical Co., Ltd., Nanfeng Chemical Group Co., Ltd., Qiao Xu (Jiujiang) Enterprise Co., Ltd. , Zhejiang Shuizhiyin Environmental Protection Technology Co., Ltd., CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., National Inorganic Salt Product Quality Supervision and Inspection Center | | Administrative Organization | National Beidou Satellite Navigation Standardization Technical Committee (SAC/TC 544) | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB 23937-2009 (GB23937-2009) | | Description (Translated English) | [GB/T 23937-2009] Sodium hydrosulfide for industrial use | | Sector / Industry | National Standard | | Classification of Chinese Standard | G12 | | Classification of International Standard | 71.060.50 | | Word Count Estimation | 10,133 | | Date of Issue | 2009-06-02 | | Date of Implementation | 2010-02-01 | | Quoted Standard | GB 190-1990; GB/T 191-2008; GB/T 3049-2006; GB/T 6682-2008; GB/T 8170; HG/T 3696.1; HG/T 3696.2; HG/T 3696.3 | | Drafting Organization | CNOOC Tianjin Chemical Research and Design Institute | | Administrative Organization | National Standardization Technical Committee machines Chemical Chemistry Branch | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 8, 2009 (No. 148 overall) | | Proposing organization | China Petroleum and Chemical Industry Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This Chinese standard specifies the requirements for industrial sodium hydrosulfide, test methods, inspection rules, marking, labeling, packaging, transportation, storage, and security. This standard applies to industrial sodium hydrosulfide, the products are mainly used in mineral processing, pesticide, leather, dye manufacturing and other industrial organic synthesis. |
GB/T 23937-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Replacing GB/T 23937-2009
Sodium hydrosulfide for industrial use
工业硫氢化钠
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Molecular formula and relative molecular mass ... 6
4 Classification ... 6
5 Technical requirements ... 6
6 Test methods ... 7
7 Inspection rules ... 15
8 Marking, labeling ... 16
9 Packaging, transportation and storage ... 16
Sodium hydrosulfide for industrial use
Warning -- According to the provisions of Chapter 6 of GB 12268-2012,
this product belongs to the 8th category of corrosive substances, which
can react with acidic substances to generate hydrogen sulfide, which is
easy to cause suffocation poisoning. Be cautious during the operation.
The personnel who use this Standard shall have hands-on experience in
formal laboratory work. This Standard 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 Standard specifies the classification, technical requirements, test methods,
inspection rules, marking, labeling, packaging, transportation and storage of
sodium hydrosulfide for industrial use.
This Standard applies to sodium hydrosulfide for industrial use, which is mainly
used in industries such as mineral processing, pesticides, leather making, dyes,
organic synthesis and water treatment.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB 190, Packing symbol of dangerous goods
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 6678, General principles for sampling chemical products
GB/T 6679, General rules for sampling solid chemical products
GB/T 6680, General rules for sampling liquid chemical products
third end points; subtract the volume that is consumed by the third end point of
the first titration; calculate the sodium carbonate content.
6.3.2 Reagents or materials
6.3.2.1 Barium chloride solution: 100 g/L.
6.3.2.2 Neutral formaldehyde solution: 37% ~ 40% aqueous solution; for the
reagent formaldehyde solution, use phenolphthalein as the indicator solution,
and use sodium hydroxide to adjust to neutral.
6.3.2.3 Hydrochloric acid standard titration solution: c(HCl) ≈ 0.1 mol/L.
6.3.2.4 Alizarin yellow GG-thymol blue mixed indicator solution:
a) Dissolve 0.1 g of alizarin yellow GG in 100 mL of 50% ethanol solution;
b) Dissolve 0.1 g of thymol blue in 100 mL of 50% ethanol solution;
c) Take 30 mL of a) and 20mL of b) and mix well.
6.3.2.5 Phenolphthalein indicator solution (10 g/L).
6.3.2.6 Bromocresol green-methyl red indicator solution.
6.3.3 Instruments and apparatuses
Acidimeter or automatic potentiometric titrator: the accuracy is 0.02 pH unit; it
is equipped with calomel electrode and glass electrode or composite electrode.
6.3.4 Test procedure
6.3.4.1 Preparation of test solution
6.3.4.1.1 Preparation of test solution A
Weigh 10 g ~ 12 g of liquid sample or 5 g of solid sample, accurate to 0.000 2
g; place it in a 500 mL volumetric flask which is pre-added with 15 mL of barium
chloride solution; use water to dilute to the mark; shake well. Use medium-
speed filter paper for dry filtration; discard the initial filtrate; collect the filtrate as
test solution A.
6.3.4.1.2 Preparation of test solution B
Weigh 10 g ~ 12 g of liquid sample or 5 g of solid sample, accurate to 0.000 2
g; dissolve it in a 500 mL volumetric flask; add water to dilute to the mark; shake
well, as test solution B.
6.3.4.2 Determination
6.3.5.2 Sodium hydrosulfide content
The sodium hydrosulfide content is calculated, as mass fraction w2 of sodium
hydrosulfide (NaHS), according to Formula (2):
Where:
V2 -- value of the volume of hydrochloric acid standard titration solution that is
consumed at the end of the second titration of the test solution that is
added with barium chloride, in milliliters (mL);
V1 -- value of the volume of hydrochloric acid standard titration solution that is
consumed at the end of the first titration of the test solution that is added
with barium chloride, in milliliters (mL);
c -- exact value of the hydrochloric acid standard titration solution concentration,
in moles per liter (mol/L);
M -- value of the molar mass of sodium hydrosulfide, in grams per mole (g/mol)
(M = 56.06);
m -- value of the sample (see 6.3.4.1.1) mass, in grams (g).
Take the arithmetic mean of the two parallel determination results as the final
result; the difference between the absolute values of the two parallel
determination results shall not exceed 0.2%.
6.3.5.3 Sodium carbonate content
The sodium carbonate content is calculated, as mass fraction w3 of sodium
carbonate (Na2CO3), according to Formula (3):
Where:
V3’ -- volume of hydrochloric acid standard titrant that is consumed at the end
of the third titration of the test solution without barium chloride, in
milliliters (mL);
V2’ -- volume of hydrochloric acid standard titrant that is consumed at the end
of the second titration of the test solution without barium chloride, in
milliliters (mL);
6.4.2.7 Starch indicator solution (10 g/L).
6.4.3 Instruments and apparatuses
Micro burette: 10 mL, division value of 0.05 mL.
6.4.4 Test procedure
6.4.4.1 Pipette 200 mL of test solution B; place it in a 500 mL volumetric flask;
successively add 60 mL of sodium carbonate solution, 120 mL of zinc sulfate
solution, 40 mL of 95% ethanol; add water to dilute to the mark; shake well; dry
filter; discard the first 20 mL of filtrate; collect the filtrate in a 500 mL conical
flask.
6.4.4.2 Pipette 100 mL of filtrate into a 250 mL conical flask; add 10 mL of glacial
acetic acid solution, 2 mL of starch indicator solution; use iodine standard
titration solution to titrate until the solution appears blue, as the end point; mark
the volume of the consumed iodine standard titration solution as V4.
6.4.4.3 Pipette another 100 mL of filtrate into another 250 mL conical flask; add
5 mL of formaldehyde solution, 10 mL of glacial acetic acid solution, 2 mL of
starch indicator solution; use iodine standard titration solution to titrate until the
solution appears blue, as the end point; mark the consumed iodine standard
titration solution as V5.
6.4.5 Test data processing
The sodium sulfite content is calculated, as mass fraction w4 of sodium sulfite
(Na2SO3), according to Formula (4):
Where:
V4 -- value of the total volume of iodine standard titration solution that is
consumed by sodium thiosulfate and sodium sulfite, in milliliters (mL);
V5 -- value of the volume of iodine standard titration solution that is consumed
by sodium thiosulfate, in milliliters (mL);
c -- actual concentration of the iodine standard titration solution, in moles per
liter (mol/L);
M1 -- value of the molar mass of sodium sulfite, in grams per mole (g/mol) (M =
126.0);
m1 -- value of the sample (see 6.3.4.1.2) mass, in grams (g).
7 Inspection rules
7.1 This Standard adopts type inspection and delivery inspection. Type
inspection and delivery inspection shall meet the following requirements:
a) All indicator items which are specified in the requirements of this Standard
are type inspection items. Under normal production conditions, type
inspection shall be carried out at least once every six months. Type
inspection shall be carried out in any of the following situations:
1) when a key production process is updated;
2) when there are changes in the main raw materials;
3) when the suspended production is resumed;
4) when it is significantly different from the previous type inspection;
5) contractual provisions.
b) The sodium hydrosulfide content, sodium sulfide content, and sodium
carbonate content indicators which are specified in the requirements of
this Standard are delivery inspection items and shall be inspected batch
by batch.
7.2 Products which are produced with the same materials and basically the
same production conditions continuously or in the same group, by the
production enterprise, are the same batch. Each batch of solid products does
not exceed 60 t; liquid products are determined according to the size of the
storage container.
7.3 Determine the number of sampling units and sampling method in
accordance with the provisions of GB/T 6678, GB/T 6679, and GB/T 6680. Mix
at least 200 g of liquid or 100 g of solid samples evenly; then, put them in two
clean and dry sample bottles or sample bags respectively; label them, marking:
manufacturer name, product name, specification, batch number or production
date. One is for analysis and inspection; the other is kept for future reference.
7.4 When any indicator of the inspection result does not meet the requirements
of this Standard, it shall sample from double the packages for re-inspection; If
any indicator the re-inspection result does not meet the requirements of this
Standard, the whole batch of products shall be judged as unqualified.
7.5 Use the rounded value comparison method that is specified in GB/T 8170
to determine whether the inspection results meet the standard.
......
GB 23937-2009
ICS 71.060.50
G 12
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Sodium hydrosulfide for industrial use
工业硫氢化钠
ISSUED ON. JUNE 02, 2009
IMPLEMENTED ON. FEBRUARY 01, 2010
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 ... 4
2 Normative references ... 4
3 Molecular formula and relative molecular mass ... 5
4 Classification and appearance ... 5
5 Requirements ... 5
6 Test methods ... 5
7 Inspection rules ... 10
8 Marking and labeling ... 11
9 Packaging, transportation and storage ... 11
10 Safety ... 12
Foreword
Clause 7, Clause 8, Clause 9 and Clause 10 in this Standard are mandatory, the rest are
recommendatory.
This Standard is proposed by China Petroleum and Chemical Industry Association.
This Standard is under the jurisdiction of Inorganic Chemical Industry Sub-committee of
National Technical Committee on Chemical of Standardization Administration of China
(SAC/TC 63/SC 1).
The responsible drafting organizations are. CNOOC Tianjin Chemical Research & Design
Institute, Nafine Chemical Industry Group Co., Ltd and Dongying Sanxie Chemical Co.,
Ltd.
The chief drafting staffs of this Standard. Fan Guoqiang, Zhang Tiezhu, Chen Aibing, Wei
Junwen and Li Zhiqi.
This Standard is issued for the first time.
Sodium hydrosulfide for industrial use
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking,
labeling, packaging, transportation, storage and safety of sodium hydrosulfide for
industrial use.
This Standard is applicable to sodium hydrosulfide for industrial use, and the product is
mainly used for beneficiation, pesticide, leather, dye production, organic synthesis and
other industries.
2 Normative references
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrections) or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest editions shall be applicable to
this Standard.
GB 190-1990 Labels for packages of dangerous goods
GB/T 191-2008 Packaging - Pictorial marking for handling of goods (ISO 780. 1997,
MOD)
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 6682-2008 Water for analytical laboratory use - Specification and test methods
(ISO 3696. 1987, MOD)
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
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 for
chemical analysis
weighing bottle. TRANSFER all of them into a 500mL volumetric flask with 15mL barium
chloride solution in it. ADD small amount of water to dissolve them, SHAKE well, LET it
stand for 10 min. DILUTE with water to the graduation, MIX well.
CONDUCT dry filtration with medium-speed filter paper, DISCARD 20mL primary filtrate,
COLLECT the filtrate in a 500mL dry conical flask, filtrate volume shall be just enough for
the test, COVER the rubber plug well, this solution is the test solution A, it is used for the
determination of sodium hydrosulfide content, sodium sulfide content, and iron content.
CALCULATE the mass (m) of sodium hydrosulfide solid in the fully soluble sample
solution according to formula (1).
Where.
m1 — The value of the mass of fully soluble sample solution prepared, the unit is in g;
m2 — The value of the net mass of the dissolved sodium hydrosulfide, the unit is in g;
m3 — The value of the mass of fully soluble sample solution weighed with weighing bottle,
the unit is in g.
6.3.4.2 Determination
TAKE 25mL solution A, PUT it in 250mL conical flask, ADD 20mL water, ADD 10 drops of
alizarin yellow GG - thyme phenol blue mixed indicator liquid. TITRATE with titration
solution of hydrochloric acid standard, when the solution’s color turns from green to blue, it
is deemed as the first end point. Then ADD 5mL formaldehyde and 3 drops of
phenolphthalein indicating liquid, CONTINUE to use hydrochloric acid standard titration
solution to titrate, when the red disappears from the solution, it is deemed as the second
end point.
6.3.5 Result calculation
6.3.5.1 Sodium hydrosulfide content is calculated based on the mass fraction of sodium
hydrosulfide (NaHS) w1, represented by the figures in the form of %, and calculated
according to the formula (2).
Within the pH value of 2 - 9, bivalent iron and phenanthroline generate red complex, USE
spectrophotometer to measure the absorbance under the maximum absorption
wavelength (510 nm).
6.4.2 Reagents and materials
6.4.2.1 Sulfuric acid solution. 1+5;
6.4.2.2 Other reagents are same as GB/T 3049-2006, Chapter 3.
6.4.3 Instrument and apparatus
6.4.3.1 Porcelain crucible. 50mL;
6.4.3. Other equipment are same as GB/T 3049-2006, Chapter 4.
6.4.4 Analytical steps
6.4.4.1 Drawing of working curve
DRAW the working curve according to the provisions of 6.3 in GB/T 3049-2006.
6.4.4.2 Determination
WEIGH about 2 g liquid sample or fully soluble sample solution, PUT it into 50mL
porcelain crucible. TITRATE 4mL of sulfuric acid solution in the fume cupboard. PLACE
the porcelain crucible on the furnace and HEAT it till sulfuric acid is totally removed.
PLACE the porcelain crucible in the high temperature furnace and BURN it under 600 ºC
for 10 min. COOL it, ADD 1mL 1 + 1 hydrochloric acid solution and right amount of water,
HEAT it to dissolve the residue. After cooling, TRNASFER the solution into 100mL
volumetric flask, according to the provisions of 6.4 in GB/T 3049-2006, starting from
"when necessary, ADD water to about 60mL", PERFORM operation to the test solution.
Meanwhile, CARRY out a blank test, blank test refers to - not adding sample during
preparing test solution, while addition of other reagents is the same as that during
handling samples.
6.4.5 Result calculation
The iron content is calculated based on iron (Fe) mass fraction w3, represented by the
figures in the form of %, and calculated according to the formula (4).
Where.
9.1 Solid sodium hydrosulfide for industrial use adopts metal drum as its package or other
packages consistent with storage and transportation safety requirements at customer's
request. Net content per package unit is 25 kg, 50 kg or 150 kg respectively; Liquid
product is loaded and transported with a metal drum or tank truck with a net content of 200
kg per drum.
9.2 Sodium hydrosulfide for industrial product use shall be stored in a cool, dry and
ventilated warehouse, kept from drench, damp and heat, and must not contact with acid
and corrosive materials.
9.3 Transportation of sodium hydrosulfide for industrial use product shall be kept from
sun, rain, heat, and maintained with intact packaging.
9.4 The warranty of sodium hydrosulfide for industrial use is one year under the room
temperature below 20ºC, relative humidity not more than 60% and intact packaging.
10 Safety
10.1 Production site must be well ventilated. And it shall be equipped with a warning
device of hydrogen sulfide gas and necessary protection equipment used in case of a gas
leak.
10.2 During the process of analytical inspection, there is emitted hydrogen sulfide gas, it
shall be carried out in the fume cupboard with good ventilation.
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