ISO 1843-4-1977 rus PDF

Full title and description

ISO 1843-4:1977 — Higher alcohols for industrial use — Methods of test — Part 4: Determination of bromine number — Titrimetric method in the presence of mercury(II) chloride. This part specifies a titrimetric procedure for determining the bromine number of higher (C6–C13) alcohols used in industry.

Abstract

The standard defines a volumetric titration using a standard bromide/bromate solution (with methyl orange indicator) carried out in the presence of mercury(II) chloride to determine the bromine number (expressed as g Br2 per 100 g sample) for higher alcohols intended for industrial use. The published edition is short (2 pages) and the standard has been withdrawn.

General information

• Status: Withdrawn (withdrawal recorded for the 1977 edition).
• Publication date: May 1977 (1977-05).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.080.60 (Alcohols. Ethers).
• Edition / version: Edition 1 (1977).
• Number of pages: 2.

Scope

This part of ISO 1843 applies to higher alcohols (notably C6–C13 fractions) intended for industrial use and specifies a titrimetric method for determining the bromine number — a measure of unsaturation — by titration with a bromide–bromate solution in the presence of mercury(II) chloride, using methyl orange as indicator. The procedure is intended for routine laboratory quality control of such alcohols.

Key topics and requirements

• Definition of bromine number for higher alcohols and its expression (g Br2 per 100 g sample).
• Sample preparation and applicable C6–C13 alcohol fractions covered.
• Titrimetric procedure using KBr/KBrO3 (bromide–bromate) standard solution.
• Use of mercury(II) chloride in the method matrix and methyl orange as the visual indicator.
• Precision and reporting: results expressed as the arithmetic mean of duplicate determinations (rounding rules described in related procedural guidance from similar test methods).

Typical use and users

Analytical and quality‑control laboratories in chemical and petrochemical companies, manufacturers of higher alcohols and industrial solvents, contract testing laboratories, and standards bodies consulting historical test methods. The method is primarily of interest for legacy data comparison, method development, or when assessing historical quality records for higher alcohol streams.

Related standards

ISO 1843 is a multipart series; other parts from the same series include methods for acidity, carbonyl compounds, total alcohols, ash, distillation yield and sulfuric acid colour tests (other parts of ISO 1843 from the 1977/1982 period are also marked withdrawn). National and industry equivalents for bromine number testing (different matrices and instrumentation) include ASTM methods and regional standards such as GOST procedures for bromine number determination of petroleum fractions. British and national test collections (e.g., BS 4583 methods for higher alcohols) cross‑reference ISO 1843 parts.

Keywords

ISO 1843-4, higher alcohols, bromine number, titration, bromide–bromate, KBr/KBrO3, mercury(II) chloride, methyl orange, quality control, withdrawn standard.

FAQ

Q: What is this standard?

A: ISO 1843-4:1977 is Part 4 of the ISO multipart standard for higher alcohols for industrial use, specifying a titrimetric method for determining the bromine number in higher alcohols.

Q: What does it cover?

A: It covers a titrimetric procedure (bromide/bromate titration in the presence of mercury(II) chloride with methyl orange indicator) for measuring the bromine number of C6–C13 industrial alcohols and gives requirements for carrying out and reporting the test.

Q: Who typically uses it?

A: Chemical manufacturers, QA/QC laboratories, testing houses and standards committees dealing with product specifications and historical method comparisons use or consult this method. It is most relevant where historical consistency with older records or comparison to legacy data is required.

Q: Is it current or superseded?

A: The 1977 edition is recorded as withdrawn. Many parts of the ISO 1843 series have since been withdrawn (some without direct replacement); users should consult current national or international methods (e.g., more recent ISO parts, ASTM procedures or national GOST documents) for up‑to‑date test methods.

Q: Is it part of a series?

A: Yes — ISO 1843 is a multipart set of test methods for higher alcohols for industrial use (other parts cover acidity, carbonyls, total alcohol content, ash, distillation yield, sulphuric acid colour test, etc.). Several parts from the 1977/early‑1980s series are withdrawn.

Q: What are the key keywords?

A: Bromine number, higher alcohols, titration, bromide–bromate, KBr/KBrO3, mercury(II) chloride, methyl orange, ISO 1843-4, withdrawn standard.