ISO 2888-1973 PDF

Full title and description

ISO 2888:1973 — Furfural for industrial use — Determination of acidity to phenolphthalein — Volumetric method. Specifies a simple volumetric titration procedure to determine the acidity (to phenolphthalein) of industrial-grade furfural, using standard sodium hydroxide and phenolphthalein as indicator.

Abstract

Pretreatment of the water used (freshly boiled and cooled) by neutralization when required, addition of the test portion and titration with a standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator until the appearance of a pale pink colour. The method is a volumetric titration expressed in terms of acidity to phenolphthalein.

General information

• Status: Withdrawn (withdrawal of the International Standard recorded).
• Publication date: December 1973 (Edition 1, 1973-12).
• Publisher: ISO — International Organization for Standardization (ISO/TC 47 responsible technical committee).
• ICS / categories: 71.080.80 (Aldehydes and ketones).
• Edition / version: Edition 1 (1973).
• Number of pages: 2 (concise procedural specification).

Scope

Defines a titrimetric procedure for determining the acidity (as detected by phenolphthalein) in furfural intended for industrial use. The procedure covers sample pretreatment (use of freshly boiled, cooled water), neutralization of the diluent if necessary, preparation of the test portion and titration with standard NaOH to the phenolphthalein endpoint (pale pink). The standard is specific to furfural and intended for routine laboratory quality control.

Key topics and requirements

• Applicability: industrial furfural samples for acidity determination to phenolphthalein.
• Sample preparation: use of freshly boiled and cooled (CO2‑free) water for dilution and possible neutralization of the water before testing.
• Reagents and titrant: standard volumetric sodium hydroxide solution; phenolphthalein indicator; sulfuric acid may be used for neutralization of water if required.
• Procedure: add test portion to prepared diluent, titrate with NaOH in presence of phenolphthalein until a pale pink endpoint persists.
• Result expression: acidity reported according to the titre obtained (method describes calculation and expression appropriate for furfural quality control).
• Quality practice: routine laboratory glassware and good volumetric technique; attention to CO2 contamination and indicator endpoint reproducibility.

Typical use and users

Used by chemical manufacturers, quality control and analytical laboratories, purchasers and suppliers of industrial furfural, and regulatory or conformity-assessment bodies concerned with product quality and specification compliance. Typical applications are acceptance testing, batch release, and routine QC of incoming/outgoing furfural.

Related standards

Standards addressing furfural test methods and related determinations include ISO 2511:1974 (Furfural — List of methods of test) and ISO 2512:1974 (Furfural — Determination of total carbonyl compounds — Volumetric method); other ISO methods for acidity to phenolphthalein in industrial liquids (for example, methods in the ISO 1388 and ISO 1843 series for ethanol and higher alcohols) use a similar titrimetric principle. These related documents give broader context for sampling and complementary analyses.

Keywords

furfural; acidity to phenolphthalein; volumetric titration; NaOH titration; phenolphthalein endpoint; industrial furfural; ISO 2888:1973.

FAQ

Q: What is this standard?

A: ISO 2888:1973 is an ISO method titled "Furfural for industrial use — Determination of acidity to phenolphthalein — Volumetric method" that specifies a titrimetric procedure for measuring acidity in industrial furfural.

Q: What does it cover?

A: It covers sample dilution and pretreatment, use of freshly boiled and cooled water (neutralized if necessary), and titration of a test portion with standard sodium hydroxide in the presence of phenolphthalein until a pale pink endpoint is reached; results are reported as acidity to phenolphthalein.

Q: Who typically uses it?

A: Chemical producers, QC laboratories, suppliers and purchasers of furfural, and testing laboratories performing routine quality-control analyses for industrial furfural.

Q: Is it current or superseded?

A: ISO 2888:1973 has been withdrawn (withdrawal recorded on 27 May 2002). ISO’s bibliographic record shows the standard as withdrawn and does not list a direct replacement in the same entry; users should consult current ISO catalogues or national standards bodies for any successor or updated test methods.

Q: Is it part of a series?

A: It is one of several ISO documents addressing test methods for industrial liquids and specifically for furfural; related ISO publications (for furfural and other industrial liquids) include ISO 2511:1974 and ISO 2512:1974 among others that form a set of test-method references for furfural analysis.

Q: What are the key keywords?

A: Furfural; acidity; phenolphthalein; titration; volumetric method; NaOH; industrial chemicals; ISO 2888:1973.