GB/T 623-2024 (English Version)

Standard No.: GB/T 623-2024
Language: Chinese, Available in English version
Release Date: 2024
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 623-2024
Replace By: GB/T 623-2011

Scope: This document specifies the properties, technical requirements, test methods, inspection rules, packaging and marking of chemical reagent perchloric acid. This document is applicable to the inspection of chemical reagent perchloric acid. Note: The molecular formula of chemical reagent perchloric acid is HClO4, the relative molecular mass is 100.45 (according to the 2022 International Relative Atomic Mass), and the CAS number is 7601-90-3.

Introduction

1. Standard Overview

GB/T 623-2024 "Chemical Reagent Perchloric Acid" is a national standard of the People's Republic of China, which is used to regulate the properties, technical requirements, test methods and packaging marks of perchloric acid. This standard replaces the previous GB/T 623-2011 version and has made important updates to the determination methods of manganese, iron, copper, silver and lead as well as packaging marks.

2. Comparison of Technical Requirements

Item	Superior grade	Analytical grade
Perchloric acid (HClO4), w/%	70.0～72.0	70.0～72.0
Chroma, Hessian units	≤10	≤15
Ethanol insoluble matter, w/%	≤0.001	≤0.002

3. Interpretation of experimental methods

Determination of perchloric acid content:Weigh 5 g of sample, pour into a stoppered weighing bottle, add water to dissolve, and titrate with sodium hydroxide standard titration solution. Calculate the mass fraction by the formula: w = (VcMm × 100%).

Colorimetric determination:According to GB/T 605, take 50 mL of sample for colorimetric comparison.

Ignition residue determination:Weigh 40 g of sample, ignite at high temperature in a quartz dish to constant weight, and calculate the result according to GB/T 9741-2008.

4. Implementation suggestions

Strictly follow the test methods specified in the standard to ensure data accuracy.
Pay attention to safe operation, perchloric acid is highly corrosive and oxidizing.
Refer to the latest technical requirements and packaging marking regulations during procurement and production.

GB/T 623-2024 Referenced Document

GB 15258 General rules for preparation of precautionary label for chemicals
GB 15346 Chemical reagent.Packaging and marking
GB/T 23942-2009 Chemical reagent.General rules for inductively coupled plasma atomic emission spectrometry
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 605 Chemical reagent General method for the measurement of colour
GB/T 610-2008 Chemical reagent.General method for the determination of arsenic
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 9727 Chemical reagent.General method for the determination of phosphate
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 9741-2008 Chemical reagent.General method for the determination of residue after ignition
GB/T 9742 Chemical reagent.General method for the determination of silicate
HG/T 3921 Chemical reagent.Regulations for sampling and acceptance

GB/T 623-2024 history

2024 GB/T 623-2024 Chemical reagents: Perchloric acid
2011 GB/T 623-2011 Chemical reagent—Perchloric acid
1992 GB/T 623-1992 Chemical reagent--Perchloric acid
0000年 GB 623-1977