ISO 7104-1985 PDF

Full title and description

Liquefied anhydrous ammonia for industrial use — Determination of water content — Gas chromatographic method. This International Standard specifies a method in which water present in a sample of liquefied anhydrous ammonia is transformed into acetylene by reaction with calcium carbide; the acetylene formed is determined by gas chromatography using an external standard.

Abstract

ISO 7104:1985 defines a laboratory procedure to measure trace to moderate amounts of water in liquefied anhydrous ammonia intended for industrial use. The procedure converts water to acetylene (via calcium carbide) and quantifies acetylene by gas chromatography against an external acetylene standard. The method is applicable over the range 5 mg/kg to 3 000 mg/kg and includes apparatus, reagents, column and chromatographic conditions, and safety warnings relevant to handling ammonia and reactive reagents.

General information

• Status: Withdrawn (withdrawal recorded in ISO metadata).
• Publication date: August 1985 (first edition, 1985).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.99 (Chemistry; chemical analysis).
• Edition / version: Edition 1 (1985).
• Number of pages: 4.

Scope

The standard applies to liquefied anhydrous ammonia for industrial use and specifies a gas‑chromatographic method for determining water contents between 5 mg/kg and 3 000 mg/kg. It covers required reagents (notably calcium carbide and appropriate carrier/auxiliary gases), apparatus (reaction tube, chromatography column, inflatable collection balloon, etc.), preparation of standards and chromatographic conditions, plus procedural safety precautions for handling ammonia and reactive reagents.

Key topics and requirements

• Principle: conversion of water to acetylene by reaction with calcium carbide and quantification of acetylene by gas chromatography (external standard method).
• Applicability: validated range 5 mg/kg to 3 000 mg/kg water in liquefied ammonia.
• Reagents and gases: analytical‑grade calcium carbide, carrier gas (e.g., nitrogen), auxiliary gases (hydrogen, air) and a known acetylene standard gas.
• Apparatus and column: specified reaction tube resistant to pressure, chromatograph oven control, and packed column characteristics to separate acetylene from impurities.
• Safety requirements: strong warnings about ammonia’s corrosive/toxic character and hazards of calcium carbide/acetylene (flammability, explosion risk) and recommendations for personal protective equipment and fume‑cupboard operation.

Typical use and users

Laboratories performing quality control or acceptance testing of industrial ammonia shipments, producers of liquefied ammonia, chemical testing laboratories, and regulatory or safety laboratories concerned with product specification and safety compliance. The method is intended for use by analysts trained in gas chromatography and in handling hazardous chemicals and compressed/liquefied gases.

Related standards

Standards that are referenced or helpful when working with ISO 7104 include sampling and safety standards for chemical products and ammonia (for example ISO 7103 on sampling of liquefied anhydrous ammonia and ISO 3165 on safety in sampling), as well as analytical apparatus and sieve standards referenced for reagent preparation. Users should consult current versions of those standards where available.

Keywords

anhydrous ammonia; liquefied ammonia; water content determination; gas chromatography; acetylene; calcium carbide; analytical method; QC; industrial chemicals.

FAQ

Q: What is this standard?

A: ISO 7104:1985 is an ISO laboratory standard that specifies a gas‑chromatographic method for determining the water content of liquefied anhydrous ammonia intended for industrial use.

Q: What does it cover?

A: It covers the analytical principle (conversion of water to acetylene via calcium carbide), required reagents and gases, apparatus and chromatographic conditions, standard preparation, the applicable concentration range (5 mg/kg to 3 000 mg/kg), and safety precautions for handling ammonia and reactive reagents.

Q: Who typically uses it?

A: Chemical manufacturers, QC laboratories, contract testing laboratories, and regulatory or inspection bodies involved in specification, testing and safe handling of liquefied anhydrous ammonia.

Q: Is it current or superseded?

A: ISO 7104:1985 is recorded as withdrawn in ISO’s metadata; it is not an active current International Standard. Users should check for any newer ISO publications or national/adopted methods that replace or supersede it before relying on the procedure for regulatory or contractual testing.

Q: Is it part of a series?

A: It is part of ISO work on liquefied anhydrous ammonia and analytical/sampling standards; related documents include sampling and safety standards for ammonia and other referenced ISO analytical standards.

Q: What are the key keywords?

A: Anhydrous ammonia, liquefied ammonia, water determination, gas chromatography, acetylene, calcium carbide, analytical method, industrial QC.