ISO 10349-7-1992 PDF

Full title and description

ISO 10349-7:1992 — Photography — Photographic-grade chemicals — Test methods — Part 7: Determination of alkalinity or acidity. This part of ISO 10349 specifies a general laboratory method for deciding whether a photographic-grade chemical sample is alkaline or acidic and for determining the magnitude of alkalinity or acidity where required.

Abstract

The procedure is based on weighing a test portion, dissolving it in carbon-dioxide-free water, adding phenolphthalein indicator and observing the colour change: a pink colour indicates alkalinity (followed by titration as required), while a colourless result indicates acidity (with titration to determine acidity). Reagents specified include 0.01 mol/l standard hydrochloric acid, 0.01 mol/l carbonate-free sodium hydroxide and phenolphthalein indicator.

General information

• Status: Published — International Standard (confirmed at systematic review in 2023, remains current).
• Publication date: December 1992 (published 30 December 1992 per ISO publication record).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 37.040.30 — Photographic chemicals.
• Edition / version: Edition 1 (1992).
• Number of pages: 2.

Scope

This part of ISO 10349 gives a general test method for determination of either alkalinity or acidity of photographic-grade chemicals. It is intended for routine quality-control testing of photographic chemical products and complements the other parts of the ISO 10349 series that cover specific analytical determinations for photographic materials.

Key topics and requirements

• Definition of the test portion and sample preparation (weighing and dissolution in carbon-dioxide-free water).
• Use of phenolphthalein indicator to screen for alkalinity (pink) or acidity (colourless).
• Specification of standard reagents (e.g., 0.01 mol/l HCl and 0.01 mol/l carbonate-free NaOH) and basic titration steps for quantification.
• Requirements for test conditions (use of CO2-free water to avoid carbonate interference).
• Coordination with ISO 10349 Part 1 (general requirements) and other parts of the series for complete chemical characterization.

Typical use and users

Laboratory technicians and quality-control personnel at manufacturers and suppliers of photographic-grade chemicals use this method for acceptance testing, batch verification and troubleshooting. Analytical laboratories performing routine testing for photographic products, research groups working on photographic chemistry, and standards bodies referencing consistent test procedures also use the standard.

Related standards

ISO 10349 is a multipart series covering test methods for photographic-grade chemicals; related parts include ISO 10349‑1 (general), ISO 10349‑2 (matter insoluble in water), ISO 10349‑3 (matter insoluble in ammonium hydroxide), ISO 10349‑4 (residue after ignition), ISO 10349‑5 (heavy metals and iron), ISO 10349‑6 (halide content), ISO 10349‑8 (volatile matter), ISO 10349‑9 (reaction to ammoniacal silver nitrate), ISO 10349‑10 (sulfide content), ISO 10349‑11 (specific gravity) and ISO 10349‑12 (density). Use ISO 10349‑1 for general requirements that apply across the series.

Keywords

photography; photographic-grade chemicals; alkalinity; acidity; titration; phenolphthalein; CO2-free water; ISO 10349; quality control.

FAQ

Q: What is this standard?

A: ISO 10349-7:1992 is an ISO international standard that specifies a laboratory test method for determining whether photographic-grade chemical samples are alkaline or acidic and, where needed, quantifying the alkalinity or acidity.

Q: What does it cover?

A: It covers sample preparation (weighing and dissolution), the screening step using phenolphthalein indicator, selection of appropriate standard reagents (0.01 mol/l HCl or carbonate-free 0.01 mol/l NaOH) and titration procedures to determine the amount of alkalinity or acidity. It is a short, focused procedure intended for routine testing.

Q: Who typically uses it?

A: Quality-control laboratories at photographic-chemical manufacturers and suppliers, independent analytical testing labs, research laboratories in photographic chemistry, and standards/quality professionals who need a repeatable test method for photographic chemicals.

Q: Is it current or superseded?

A: As of the latest ISO lifecycle review, ISO 10349-7:1992 was reviewed and confirmed in 2023 and therefore the 1992 edition remains current (confirmed). The ISO record shows the standard as Published and Confirmed following the 2023 review.

Q: Is it part of a series?

A: Yes — ISO 10349 is a multipart series of test methods for photographic-grade chemicals; Part 7 is one of multiple parts that together provide a suite of laboratory tests for different chemical properties.

Q: What are the key keywords?

A: Photographic-grade chemicals, alkalinity, acidity, titration, phenolphthalein, CO2-free water, ISO 10349, quality control.