ISO 1897-8-1977 rus PDF

Full title and description

ISO 1897-8:1977 — Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use — Methods of test — Part 8: Determination of o-cresol content (cresylic acid and xylenols only). Also issued/sold in Russian-language editions under the name "Ст ISO 1897-8-1977 rus" (translated version of the ISO text for Russian users).

Abstract

This part specifies a test method for determining the o-cresol content in cresylic acid and xylenols. The procedure is based on dehydration of the test portion, formation of a complex between o-cresol and cineole (having a crystallizing point not lower than 1.2 °C), measurement of the crystallizing point of that complex, and calculation of o-cresol content from the crystallizing point together with the water content of the sample. The method was published in 1977 and later withdrawn.

General information

• Status: Withdrawn (ISO record: Withdrawn).
• Publication date: April 1977 (Edition 1 — 1977-04).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.080.40 (Organic acids); 71.080.90 (Phenols).
• Edition / version: Edition 1 (1977).
• Number of pages: 5 pages.

Scope

The standard prescribes a laboratory test for determining o-cresol in cresylic acid and xylenol samples. It was primarily intended for samples containing around 40 % (m/m) or more o-cresol but the method was extended to cover lower concentration ranges. The procedure requires dehydration of the sample, formation of an o-cresol–cineole complex and determination of its crystallizing point to derive the o-cresol content.

Key topics and requirements

• Principle: dehydration of the sample, addition of excess cineole to form an o-cresol–cineole complex, determination of crystallizing point, calculation of o-cresol content from the crystallizing point and water content.
• Intended sample range: primarily for samples ≈40 % (m/m) o-cresol and above; extended to lower ranges by the method text.
• Apparatus and reagents: crystallizing-point apparatus and cineole of specified purity (crystallizing point not lower than 1.2 °C) are required.
• Reference table: provides the relation between crystallizing point and o-cresol content for o-cresol/cineole mixtures.
• History: this part replaced ISO Recommendation R 1910:1971 and itself has later been withdrawn.

Typical use and users

Analytical and quality-control laboratories in chemical manufacturing (phenolics and cresylic fractions), purchasers and suppliers of industrial phenolic products, and national standards bodies or libraries that maintain historic method collections. The method is of interest when evaluating older test data or when following legacy procedures for cresylic-acid/xylenol analyses.

Related standards

ISO 1897 is a multipart series covering methods of test for phenol, cresols and related materials. Related parts include ISO 1897-2 through ISO 1897-13 (various test methods such as determination of water, neutral oils, colour, m-cresol, crystallizing point, distillation characteristics, residue on distillation, etc.). Many parts of the series have been withdrawn over time. ISO 1897-8:1977 specifically replaced ISO/R 1910:1971 when published.

Keywords

o-cresol; cresylic acid; xylenols; phenol; methods of test; cineole complex; crystallizing point; ISO 1897; analytical chemistry; phenolic fractions.

FAQ

Q: What is this standard?

A: ISO 1897-8:1977 is Part 8 of the ISO 1897 series, describing a laboratory method to determine o-cresol content in cresylic acid and xylenols.

Q: What does it cover?

A: It covers a test based on forming an o-cresol–cineole complex after sample dehydration, measuring the complex's crystallizing point, and calculating o‑cresol concentration from that temperature together with the sample water content.

Q: Who typically uses it?

A: Chemical laboratories, manufacturers and suppliers of phenolic products, and standards libraries or archivists referencing historical test methods. It is principally a QC/analytical method rather than a manufacturing specification.

Q: Is it current or superseded?

A: The standard is withdrawn. ISO’s official record shows the status as Withdrawn; national catalogues and standards sellers record withdrawal (national withdrawal entries report the withdrawal date as 27 May 2002 in several catalogs). Users should consult current national or ISO standards for replacement or updated methods.

Q: Is it part of a series?

A: Yes — ISO 1897 is a multipart series (Parts 1–13 in various editions) covering methods of test for phenol, cresols, cresylic acid and xylenols; Part 8 is specifically the o‑cresol determination method. Many parts of the series have individual statuses and revision/withdrawal histories.

Q: What are the key keywords?

A: o-cresol, cresylic acid, xylenols, phenol testing, cineole complex, crystallizing point, ISO 1897, analytical method.