GB/T 678-2023Chemical reagent - Ethanol (English PDF)

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,

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

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.

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