GB/T 649-2023 (English Version)

Standard No.: GB/T 649-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 649-2023
Replace By: GB/T 649-1999

Scope: This document specifies the properties, technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent potassium bromide. This document is applicable to the inspection of the chemical reagent potassium bromide. Note: The molecular formula of the chemical reagent potassium bromide is KBr, the relative molecular mass is 119.00 (according to the 2022 International Relative Atomic Mass), and the CAS number is 7758-02-3.

Introduction

1. Scope and applicability of the standard

GB/T 649-2023 Chemical Reagent Potassium Bromide specifies the properties, technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent potassium bromide (KBr). This standard is applicable to the inspection of the chemical reagent potassium bromide, whose molecular formula is KBr and relative molecular mass is 119.00.

2. Comparison of Technical Requirements

Item	Analytical purity	Chemical purity
Potassium bromide (KBr), w/%	≥99.0	≥98.0
pH value (50 g/L, 25 °℃)	5.5~8.5	5.5~8.5
Clarity test/number	≤2	≤4

3. Professional terms and practical applications

Potassium bromide is widely used in chemical reagents, especially in photography, electronics industry and laboratory analysis. For example, in photography, potassium bromide is often used in the manufacture of photographic emulsions.

4. Background of standard formulation and technological evolution

GB/T 649—2023 is the third revision of the 1999 version of the standard. The main changes include:

The technical requirements for clarity test have been changed, and more precise classification standards have been introduced.
The technical requirements and determination methods for loss on drying have been added.
The determination methods and limits of impurities such as chloride have been optimized.

5. Implementation Suggestions

To ensure the effective implementation of the standard:

Laboratories should be equipped with advanced analytical instruments, such as flame atomic absorption spectrometer (FAAS).
Operators should receive professional training and be familiar with various test methods.
Enterprises should establish an internal quality control system to ensure that products meet the requirements of the standard.

GB/T 649-2023 Referenced Document

GB 15346 Chemical reagent.Packaging and marking
GB/T 601 Chemical reagent.Preparations of reference titration solutions
GB/T 602 Chemical reagent--Preparations of standard solutions for impurity
GB/T 603 Preparation of preparations and products used in chemical reagent test methods
GB/T 609 Chemical Reagents General Method for Determination of Total Nitrogen*， 2024-04-25 Update
GB/T 6682 Water for analytical laboratory use.Specification and test methods
GB/T 9723-2007 Chemical reagent.General rule for flame atomic absorption spectrometric analysis
GB/T 9724 Chemical reagent.General rule for the determination of pH
GB/T 9728 Chemical reagent.General method for the determination of sulphate
GB/T 9729 Chemical reagent.General method for the determination of chloride
GB/T 9738 Chemical reagent.General method for the determination of water insoluble matter
GB/T 9739 Chemical reagent.General method for the determination of iron

GB/T 649-2023 history

2023 GB/T 649-2023 Chemical Reagent Potassium Bromide
1999 GB/T 649-1999 Chemical reagent-- Potassium bromide
0000年 GB/T 649-1977