GB/T 678-2023 PDF English
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| GB/T 678-2023 | English | 170 |
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Chemical reagent - Ethanol
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| GB/T 678-2002 | English | 85 |
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Chemical reagent -- Ethanol
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| GB/T 678-1990 | English | 239 |
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Chemical reagent--Ethanol
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GB/T 678-2023: Chemical reagent - Ethanol---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT678-2023
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
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 678-2002 Chemical Reagent - Ethanol. In
comparison with GB/T 678-2002, apart from structural adjustments and editorial modifications,
the main technical changes are as follows.
---The liquid-phase chromatography purity grade, technical requirements and
determination methods are added (see Chapter 5 and Chapter 6);
---The technical requirements for ethanol are modified, and the technical requirement for
top-grade purity is adjusted from “ 99.8%” to “ 99.9%” (see Chapter 5; Chapter 4 of
Version 2002);
---The unit of acidity and alkalinity is adjusted from “mmol/100 g” to “mmol/g” (see
Chapter 5; Chapter 4 of Version 2002);
---The technical requirements for moisture are modified, and the technical requirement for
top-grade purity is adjusted from “ 0.2%” to “ 0.1%” (see Chapter 5; Chapter 4 of
Version 2002);
---The technical requirements for methanol are modified, and the technical requirement
for top-grade purity is adjusted from “ 0.02%” to “ 0.005%” (see Chapter 5; Chapter
4 of Version 2002);
---The technical requirements and determination methods for n-propanol are added (see
Chapter 5 and 6.11);
---The determination methods for ethanol, methanol and isopropanol are modified (see 6.2,
6.10 and 6.11; 5.1, 5.8 and 5.9 of Version 2002);
---The determination method for density using a vibrating-type liquid density meter is
added (see 6.4);
---The packaging and marking are modified (see Chapter 8; Chapter 7 of Version 2002).
This document was drafted with reference to ISO 6353-2.1983 Reagents for Chemical Analysis
- Part 2.Specifications - First Series. The degree of consistency is non-equivalent.
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Petroleum and Chemical Industry Federation (CPCIF).
This document shall be under the jurisdiction of Chemical Reagent Subcommittee of National
Technical Committee 63 on Chemistry of Standardization Administration of China (SAC/TC
63/SC 3).
The drafting organizations of this document. Jiangsu Qiangsheng Chemical Co., Ltd.; Beijing
Chemical Reagent Research Institute Co., Ltd.; Anhui Fulltime Specialized Solvent & Reagent
Co., Ltd.; Taicang Xintai Alcohol Co., Ltd.; Changshu Binjiang Chemical Co., Ltd.; Zhejiang
Environmental Testing Technology Co., Ltd.
The main drafters of this document. Zhou Yi, Ying Li, Zhao Jifei, Wang Yuhua, Han Baoying,
Fang Ping, Chen Xiaolan, Mao Weigang, Chen Xia, Gui Xianghong, Shen Cong, Wu Bin, He
Ling.
This document was firstly issued in 1965, firstly revised in 1978, secondly revised in 1990 and
thirdly revised in 2002.This is the fourth revision.
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
3 Terms and Definitions
This document does not have terms and definitions that need to be defined.
4 Characters
Ethanol (anhydrous ethanol) is a colorless and transparent liquid that is easily volatile. It can
be mixed with water, chloroform and ether, etc., and can easily absorb water.
5 Technical Requirements
The chemical requirements for ethanol (anhydrous ethanol) are shown in Table 1.
6 Test Methods
6.1 General Rules
Unless it is otherwise specified in this Chapter, the standard titration solutions, standard
solutions, preparations and products used are prepared in accordance with the stipulations of
GB/T 601, GB/T 602 and GB/T 603.The water used for the tests shall comply with Grade-3
water specifications in GB/T 6682.The samples are weighed to an accuracy of 0.01 g or
measured-taken to an accuracy of 0.1 mL. All solutions expressed in percentage (%) are mass
fraction (w).
6.2 Ethanol
6.2.1 Reagents, materials and instruments
Shall comply with the stipulations of Chapter 5 and Chapter 6 in GB/T 9722-2006.
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.
6.8 Alkalinity
In accordance with the stipulations of 5.1 in GB/T 9736-2008, conduct the determination.
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
6.10.2 Determination conditions
See 6.2.2.
6.10.3 Determination method
Take 1 L of methanol external standard solution (6.10.1.3) and 1 L of sample, and
respectively inject the sample.
6.10.4 Calculation
The mass fraction (w2) of methanol shall be calculated in accordance with Formula (2).
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-
2006.
6.17.2 Determination conditions
6.17.3 Determination method
In accordance with the stipulations of 7.2.1 in GB/T 9721-2006, at the wavelengths specified
in 6.17.2, respectively determine the absorbance.
7 Inspection Rules
In accordance with the stipulations of HG/T 3921, conduct sampling and acceptance inspection.
8 Packaging and Marking
In accordance with the stipulations of GB 15346, conduct packaging, storage and transportation,
and make markings, including.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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