ISO 3695-1977 PDF

Full title and description

ISO 3695:1977 — Ammonium nitrate for industrial use — Determination of chloride ions content — Potentiometric method. The standard specifies a potentiometric titration procedure for measuring chloride ion content in industrial ammonium nitrate using a silver titrant and a silver measurement electrode with a calomel reference electrode.

Abstract

This International Standard (first edition, 1977) defines a potentiometric titration method applicable to ammonium nitrate products with chloride contents equal to or greater than 0.0002 % (m/m). The method uses silver nitrate titration in a nitric acid–acetone–water medium and potentiometric end‑point detection with a silver electrode and a calomel reference electrode. The standard was withdrawn from the ISO catalogue and is no longer active as an ISO publication.

General information

• Status: Withdrawn (withdrawal recorded in ISO catalogue / national catalogues).
• Publication date: December 1977 (first edition published 1977).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.50 (Salts; fertilizers / industrial salts).
• Edition / version: Edition 1 — 1977.
• Number of pages: 4 pages.

Scope

The standard applies to industrial ammonium nitrate and specifies a potentiometric titration procedure for determining chloride ion content down to approximately 0.0002 % (m/m). It covers reagents, apparatus (including electrode types), test portion and preparation, titration procedure in a nitric acid–acetone–water medium, and calculation/reporting of results. The method is intended for quality control and verification of chloride impurity levels in fertilizer and related industrial ammonium nitrate products.

Key topics and requirements

• Analyte: chloride ions (Cl−) in ammonium nitrate matrices.
• Analytical principle: potentiometric titration with standard silver nitrate (AgNO3) solution.
• Electrodes: silver measurement electrode and calomel reference electrode specified for end‑point detection.
• Medium and reagents: titration carried out in a nitric acid–acetone–water medium; specification of reagent concentrations and silver standardization procedures included.
• Limit of determination: method applicable for chloride contents ≥ 0.0002 % (m/m).
• Reporting and calculations: instructions for calculation of chloride content (expressed as mass percentage) and recommended quality‑control checks.

Typical use and users

Primary users were manufacturers of ammonium nitrate (fertilizer and industrial grades), analytical and quality control laboratories, regulatory and materials testing bodies, and standards bodies adopting or referencing ISO methods. The method served as a standardized procedure for assessing chloride impurity levels that can affect product stability, corrosion, and end‑use performance. As ISO 3695:1977 has been withdrawn, modern users may refer to current ISO standards or validated national/instrumental methods (e.g., ion chromatography or updated potentiometric procedures) for routine chloride analysis.

Related standards

Standards covering similar test methods or related salts and impurities include other ISO/TC 47 publications on industrial salts and chloride determinations (examples: ISO 2463:1973 — sodium chlorate — determination of chloride content; and more recent ISO documents on ammonium nitrate fertilizer testing and related properties). These related documents address comparable titrimetric or instrumental approaches for chloride and other impurities in industrial salts.

Keywords

ISO 3695:1977, ammonium nitrate, chloride ions, potentiometric titration, silver nitrate titration, silver electrode, calomel reference electrode, fertilizer analysis, salts, impurity determination.

FAQ

Q: What is this standard?

A: ISO 3695:1977 is an International Standard titled "Ammonium nitrate for industrial use — Determination of chloride ions content — Potentiometric method" that specifies a potentiometric titration procedure for measuring chloride in ammonium nitrate.

Q: What does it cover?

A: It covers reagents, apparatus, electrode types, test portion preparation, titration procedure using silver nitrate in a nitric acid–acetone–water medium, result calculation, and limits of applicability (method applicable for chloride ≥ 0.0002 % m/m).

Q: Who typically uses it?

A: Historically, fertilizer producers, industrial chemical manufacturers, quality control and testing laboratories, and standards organizations used this method for consistent reporting of chloride impurities in ammonium nitrate.

Q: Is it current or superseded?

A: ISO 3695:1977 has been withdrawn (no current active ISO edition listed); national catalogues and standards listings record it as withdrawn. Users should consult the ISO catalogue or national standards bodies for any more recent methods or replacements (for example, modern instrumental methods such as ion chromatography are commonly used today).

Q: Is it part of a series?

A: It was developed under ISO/TC 47 (Chemistry) and is related by topic and ICS classification (71.060.50) to other ISO methods for salts and industrial chemicals (several ISO standards exist for chloride determination in different salts and for other ammonium nitrate properties).

Q: What are the key keywords?

A: Ammonium nitrate, chloride determination, potentiometric titration, silver nitrate titration, silver electrode, calomel electrode, fertilizer analysis, ISO 3695:1977.