GB/T 678-2023_English: PDF (GB/T678-2023)
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Chemical reagent - Ethanol
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| Standard ID | GB/T 678-2023 (GB/T678-2023) | | Description (Translated English) | Chemical reagent - Ethanol | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G63 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 10,143 | | Date of Issue | 2023-08-06 | | Date of Implementation | 2024-03-01 | | Older Standard (superseded by this standard) | GB/T 678-2002 | | Drafting Organization | Jiangsu Qiangsheng Functional Chemical Co., Ltd., Beijing Chemical Reagent Research Institute Co., Ltd., Anhui Shilian Special Solvent Co., Ltd., Taicang Xintai Alcohol Co., Ltd., Changshu Binjiang Chemical Co., Ltd., Zhejiang Environmental Quality and Environmental Testing Technology Co., Ltd. | | Administrative Organization | National Chemical Standardization Technical Committee Chemical Reagents Sub-Technical Committee (SAC/TC 63/SC 3) | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 678-2002 (GB/T678-2002) | | Description (Translated English) | Chemical reagent. Ethanol | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G63 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 7,782 | | Date of Issue | 2002-05-29 | | Date of Implementation | 2002-12-01 | | Older Standard (superseded by this standard) | GB/T 678-1990 | | Adopted Standard | ISO 6353-2-1983; NEQ | | Drafting Organization | Beijing North of Fine Chemicals Co., Ltd. | | Administrative Organization | Chemicals Branch of the National Standardization Technical Committee chemistry | | Proposing organization | China Petroleum and Chemical Industry Association | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China | | Summary | This standard specifies: chemical test, ethanol (ethanol) technical requirements, test methods, inspection rules, and packaging and logo. | | Standard ID | GB/T 678-1990 (GB/T678-1990) | | Description (Translated English) | Chemical reagent--Ethanol | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G63 | | Word Count Estimation | 6,652 | | Date of Issue | 1990/12/18 | | Date of Implementation | 1991/12/1 | | Older Standard (superseded by this standard) | GB 678-1978 | | Adopted Standard | ISO 6353/2-1983, NEQ |
GB/T 678-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.30
CCS G 63
Replacing GB/T 678-2002
Chemical Reagent - Ethanol
(ISO 6353-2:1983, Reagents for Chemical Analysis - Part 2: Specifications:
First Series, NEQ)
ISSUED ON: AUGUST 6, 2023
IMPLEMENTED ON: MARCH 1, 2024
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 Terms and Definitions ... 6
4 Characters ... 6
5 Technical Requirements ... 6
6 Test Methods ... 7
7 Inspection Rules ... 13
8 Packaging and Marking ... 13
Chemical Reagent - Ethanol
WARNING: some test procedures specified in this document may lead to hazardous
situations, and it is the user’s responsibility to take appropriate safety and health
measures.
1 Scope
This document specifies the characters, technical requirements, test methods, inspection rules,
packaging and marking of the chemical reagent ethanol (anhydrous ethanol).
This document is applicable to the inspection of the chemical reagent ethanol (anhydrous
ethanol).
NOTE: the rational formula of the chemical reagent ethanol (anhydrous ethanol) is CH3CH2OH,
the relative molecular mass is 46.07 (in accordance with the 2022 international relative
atomic mass), and the CAS No. is 64-17-5.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 601 Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 602 Chemical Reagent - Preparations of Standard Solutions for Impurity
GB/T 603 Chemical Reagent - Preparations of Reagent Solutions for Use in Test Methods
GB/T 605 Chemical Reagent - General Method for the Measurement of Color
GB/T 606 Chemical Reagent - General Method for the Determination of Water - Karl Fischer
Method
GB/T 611-2021 Chemical Reagent - General Method for the Determination of Density
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 9721-2006 Chemical Reagent - General Rules for the Molecular Absorption
Spectrophotometry
GB/T 9722-2006 Chemical Reagent - General Rules for the Gas Chromatography
Carrier gas and column flow: nitrogen, 1.0 mL/min.
Chromatographic column: 100% polydimethylsiloxane capillary column (or a capillary column
that can achieve equivalent separation effects).
Column length: 30 m.
Column inner diameter: 0.32 mm.
Liquid film thickness: 0.5 m.
Column temperature: maintain at 40 C for 5 min, at a rate of 10 C/min, raise to 150 C and
maintain or 2 min.
Vaporization chamber temperature: 150 C.
Test chamber temperature: 150 C.
Degree of separation of difficult-to-separate substance pairs: Rethanol and methanol 1.5.
Effective plate height of chromatographic column: Heff 2.7 mm.
Injection volume: 0.2 L.
Split ratio: 50 : 1.
Air flow rate: 300 mL/min.
Hydrogen flow rate: 30 mL/min.
Relative retention value of a component relative to the main body: rmethanol, ethanol = 0.92; risopropanol,
ethanol = 1.08; rn-propanol, ethanol = 1.27.
6.2.3 Quantitative method
In accordance with the stipulations of 9.2 in GB/T 9722-2006, conduct the determination.
Take the arithmetic mean of two parallel determination results as the determination result. The
absolute difference between two parallel determination results shall be not greater than 0.1%.
6.3 Chroma
In accordance with the stipulations of GB/T 605, conduct the determination.
6.4 Density
In accordance with the stipulations of 4.2 or 4.4 in GB/T 611-2021, conduct the determination.
6.5 Water-mixing Test
Measure-take 15 mL of sample, add 45 mL of water, mix it well, and let it stand for 1 h. Conduct
visual inspection. The solution shall be clear and odorless.
6.6 Evaporation Residue
Weigh-take 100 g (about 127 mL) [for liquid-phase chromatography purity, take 250 g (about
316 mL); for top-grade purity, take 200 g (about 253 mL)] of sample, in accordance with the
stipulations of GB/T 9740, conduct the determination.
6.7 Acidity
In accordance with the stipulations of 5.1 in GB/T 9736-2008, conduct the determination.
Measure-take 100 mL of carbon dioxide-free water, pour it into a 250 mL conical flask, add 4
drops of phenolphthalein indicator solution (10 g/L); use sodium hydroxide standard titration
solution [c(NaOH) = 0.02 mol/L] to neutralize it, until the solution turns pink, and maintain for
30 s. Add 20 g (about 25.3 mL) of sample, use sodium hydroxide standard titration solution
[c(NaOH) = 0.02 mol/L] to titrate it, until the solution turns pink, and maintain for 30 s. The
result shall be calculated in accordance with the stipulations of 5.1.2 in GB/T 9736-2008.
6.8 Alkalinity
In accordance with the stipulations of 5.1 in GB/T 9736-2008, conduct the determination.
Measure-take 100 mL of carbon dioxide-free water, pour it into a 250 mL conical flask, add 2
drops of methyl red indicator solution (1 g/L); use hydrochloric acid standard titration solution
[c(HCl) = 0.02 mol/L] to neutralize it, until the solution changes from yellow to orange, and
maintain for 30 s. Add 20 g (about 25.3 mL) of sample, use hydrochloric acid standard titration
solution [c(HCl) = 0.02 mol/L] to titrate it, until the solution changes from yellow to orange,
and maintain for 30 s. The result shall be calculated in accordance with the stipulations of 5.1.2
in GB/T 9736-2008.
6.9 Moisture
Weigh-take 4 g (about 5 mL) of sample and use 10 mL of methanol as the solvent. In accordance
with the stipulations of GB/T 606, conduct the determination.
6.10 Methanol
6.10.1 Reagents, materials and instruments
6.10.1.1 Shall comply with the stipulations of Chapter 5 and Chapter 6 in GB/T 9722-2006.
6.10.1.2 Methanol: primary or secondary standard substance (with a metrology certificate).
6.10.1.3 Methanol external standard solution
Preparation: weigh-take an appropriate amount of sample, add an appropriate amount of
methanol standard substance, so that the methanol concentration in the solution is close to the
mass fraction of the item indicators specified in Table 1. Both weighings are accurate to 0.0001
Shall comply with the stipulations of Chapter 5 and Chapter 6 in GB/T 9722-2006.
6.11.2 Determination conditions
See 6.2.2.
6.11.3 Quantitative method
In accordance with the stipulations of 9.2 in GB/T 9722-2006, conduct the determination.
Take the arithmetic mean of two parallel determination results as the determination result. When
the concentration is not greater than 0.0005%, the difference in the determination results shall
be not greater than 20% of the arithmetic mean of two determinations; when the concentration
is greater than 0.0005%, the difference in the determination results shall be not greater than 10%
of the arithmetic mean of two determinations.
6.12 Carbonyl Compounds
Weigh-take 0.5 g (approximately 0.63 mL) of sample, in accordance with the stipulations of
GB/T 9733, conduct the determination. The dark red color of the solution shall be not darker
than the standard colorimetric solution.
The preparation of the standard colorimetric solution is to take carbonyl compound (CO)
standard solution containing 0.015 mg (top-grade purity and analytical purity) or 0.025 mg
(chemical purity) and process it in the same way at the same time as the sample.
6.13 Easily Carbonized Substance
In accordance with the stipulations of GB/T 9737-2008, conduct the determination. Measure-
take 10 mL of sulfuric acid (top-grade purity, 95% 0.5%), cool it to 10 C; under shaking,
dropwise add 10 mL of sample (at this moment, the temperature of the solution shall be not
higher than 20 C) and let it stand for 5 min. The color of the solution shall be not darker than
the R/40 (top-grade purity) or R/30 (analytical purity) or R/25 (chemical purity) standard color
specified by 5.1 in GB/T 9737-2008.
6.14 Iron
Weigh-take 20 g (about 25.3 mL) of sample, place it in an evaporating dish, add 0.5 mL of
sulfuric acid solution (10%); under an infrared lamp or on a water bath at about 75 C, evaporate
it to near dryness, and dilute to 15 mL. Use ammonia solution (10%) to adjust the pH of the
solution to 2, then, in accordance with the stipulations of GB/T 9739, conduct the determination.
The red color of the solution shall be not darker than the standard colorimetric solution.
The preparation of the standard colorimetric solution is to take the standard solution containing
0.002 mg of iron (Fe), add 0.5 mL of sulfuric acid solution (10%) and dilute to 15 mL; process
it in the same way at the same time as the sample.
6.15 Zinc
6.15.1 Reagents, materials and instruments
In accordance with the stipulations of Chapter 5 and Chapter 6 in GB/T 9723-2007.
6.15.2 Instrument conditions
Light source: zinc hollow cathode lamp.
Wavelength: 213.5 nm.
Flame: acetylene-air.
6.15.3 Determination method
Weigh-take 5 g (about 5.3 mL) of sample, place it in an evaporating dish; under an infrared
lamp or on a water bath at about 75 C, evaporate it to dryness. Add 1 mL of hydrochloric acid
solution (20%) to dissolve the residue and dilute to 10 mL. In accordance with the stipulations
of 7.2.1 in GB/T 9723-2007, conduct the determination.
6.16 Reduced Potassium Permanganate Substance
6.16.1 Preparation of Solution A
In accordance with the stipulations of 4.3 in GB/T 9737-2008, prepare the solution.
6.16.2 Preparation of Solution B
In accordance with the stipulations of 4.5 in GB/T 9737-2008, prepare the solution.
6.16.3 Determination method
Weigh-take 19 g (about 24 mL) [for chemical purity, take 8 g (about 10 mL)] of sample, pour
it into a dry colorimetric tube with a stopper, and adjust the temperature to 25 C. Add 0.1 mL
of potassium permanganate standard titration solution [c(ଵହKMnO4) = 0.1 mol/L], and shake it
well. Tightly cap the colorimetric tube, at 25 C, place it in the dark for 5 min. The pink color
of the solution shall be not lighter than the standard colorimetric solution of the same volume.
The preparation of the standard colorimetric solution is to respectively measure-take 7.9 mL of
Solution A and 6.0 mL of Solution B, pour it into a 100 mL volumetric flask, and use
hydrochloric acid solution (1 + 40) to dilute to the scale.
6.17 Absorbance
6.17.1 Reagents and instruments
The water used for the test shall comply with Grade-2 water specifications in GB/T 6682.
UV-visible spectrophotometer shall comply with the stipulations of Chapter 6 in GB/T 9721-
......
GB/T 678-2002
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.30
G 63
GB/T 678-2002 / neq ISO 6353-2:1983
Replacing GB/T 678-1990
Chemical Reagent – Ethanol
ISSUED ON: MAY 29, 2002
IMPLEMENTED ON: DECEMBER 01, 2002
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Shape and Properties ... 5
4 Specifications (See Table 1) ... 5
5 Test ... 6
6 Inspection Rules ... 9
7 Packaging and Marking ... 9
Foreword
This Standard gives three levels of guaranteed reagent, analytically pure and
chemically pure. The guaranteed reagent inequivalently adopts R11 “Ethanol” in ISO
6353-2:1983 Reagents for Chemical Analysis – Part 2: Specifications – First Series.
Their differences are as follows:
--- Specification: Compared with ISO standard, the guaranteed reagent of this
Standard adds three items including water mixing test, iron and zinc; reduces
one item of high-carbon alcohol. Six indicators of guaranteed reagents of
methanol, isopropanol, evaporation residue, acidity, alkalinity, and reduction of
potassium permanganate are stricter than ISO standard.
--- Test: Except for the test of mixing with water, all other items have adopted the
general test method standards for chemical reagents that have been formulated
in China.
This Standard was revised on the basis of GB/T 678-1990 Chemical Reagent –
Ethanol. Compared with the previous edition, the items and indicators are not changed.
This Standard replaced GB/T 678-1990 since the implementation date.
This Standard was proposed by China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of Subcommittee on Chemical Reagent
of National Technical Committee for Standardization of Chemical.
Drafting organization of this Standard: Beijing Beihua Fine Chemicals Co., Ltd.
Chief drafting staffs of this Standard: Sun Jisheng, and Li Li.
This Standard was first-time published in 1965; revised in 1978 and 1990, respectively.
Chemical Reagent – Ethanol
Rational formula: CH3CH2OH
Relative molecular mass: 46.07 (according to the international relative molecular mass
in 1997)
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules,
packaging and marking of chemical reagent – ethanol (anhydrous ethanol).
2 Normative References
The following standards contain provisions which, through reference in this Standard,
constitute provisions of this Standard. At the time of publication, the editions indicated
are valid. All standards are subject to revision. The parties who are using this Standard
shall explore the possibility of using the latest version of the following standards.
GB/T 601-1988 Chemical Reagent - Preparations of Standard Volumetric
Solutions
GB/T 602-1988 Chemical Reagent - Preparations of Stock Standard Solutions
GB/T 603-1988 Chemical Reagent – Preparations of Reagent Solutions for Use
in Test Methods
GB/T 606-1988 Chemical Reagent - General Method for the Determination of
Water (Karl Fischer Method) (eqv ISO 6353-1:1982)
GB/T 611-1988 Chemical Reagent - General Method for the Determination of
Density (eqv ISO 6353-1:1982)
GB/T 619-1988 Chemical Reagent - Regulations for Sampling and Acceptance
GB/T 6682-1992 Water for Laboratory Use – Specifications (eqv ISO 3696:1987)
GB/T 9722-1988 Chemical Reagent - General Rules for the Gas Chromatography
GB/T 9723-1988 Chemical Reagent - Rules for Flame Atomic Absorption
Spectrometry
5 Test
Unless otherwise specified in this Clause, all used standard titration solutions,
standard solutions, reagents and products shall be prepared in accordance with GB/T
601, GB/T 602, and GB/T 603. The water used in laboratory shall conform to the
specification of Class-III water in GB/T 6682-1992; samples shall be taken accurate to
0.1mL.
5.1 Mass fraction of ethanol
It shall be measured according to the provisions of GB/T 9722.
5.1.1 Measurement conditions
Detector: flame ionization detector;
Carrier gas and flow rate: nitrogen, 9 cm/s;
Column length (stainless-steel column): 3m;
Inner diameter of column: 3mm;
Stationary phase: 401 organic carrier washed by acetone [0.18mm~0.25mm (60 mesh
~ 80mesh)], aging for 4h above at 180°C;
Column temperature: 120°C;
Vaporization chamber temperature: 150°C;
Detecting chamber temperature: 150°C;
Sample-injection volume: no less than 0.4µL;
Effective board height of chromatographic column: Heff ≤ 3mm;
Asymmetry factor: f ≤ 3.4;
Relative retention value of components against the subject: r methanol, ethanol = 0.47; r
isopropanol, ethanol = 2.37.
5.1.2 Quantitative method
According to the provision of 8.2 in GB/T 9722-1988, mass correction factor of
component methanol against ethanol, f methanol/ethanol = 2.2 is required to be corrected.
5.2 Density
Pipette 0.63mL (0.5g) of sample; measure according to the provisions of GB/T 9733.
The solution turns dark-red, but shall be no darker than standard comparison solution.
The preparation of standard comparison solution shall take the standard solution
containing the following amount of carbonyl compounds.
Treat at the same time as the sample.
5.11 Carbonizable substances
It shall be measured according to the provisions of GB/T 9737. Thereof, pipette 10mL
of sulfuric acid (guaranteed reagent with mass fraction of 95% ± 0.5%); cool off to 10°C;
add 10mL (the solution temperature shall be no greater than 20°C at the same time)
of sample dropwise under shaking condition; stand for 5min. The solution color shall
be no darker than the following standard color:
5.12 Iron
Pipette 25mL (20g) of the sample; place it in an evaporation dish; add 0.5 mL of sulfuric
acid solution (with mass fraction of 10%); evaporate to near dryness under an infrared
lamp or a water bath at about 75°C; dilute to 15 mL; and use ammonia aqueous
solution (with mass fraction of 10%) to adjust the pH of the solution to 2; then measure
it according to the provisions of GB/T 9739. The solution color shall be no darker than
the standard comparison solution.
The standard comparison solution is prepared by taking a standard solution containing
0.002 mg of iron (Fe); add 0.5 mL of sulfuric acid solution (with mass fraction of 10%).
Dilute to 15 mL and treat the same volume of test solution at the same time.
5.13 Zinc
It shall be measured according to the provisions of GB/T 9723.
5.13.1 Instrument conditions
Light source: zinc hollow cathode lamp;
Wave length: 213.5nm;
Flame: acetylene-air.
Guaranteed reagent, analytically pure
Chemically pure
Guaranteed reagent
Analytically pure
Chemically pure
......
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