ISO 10349-6-1992 PDF

Full title and description

ISO 10349-6:1992 — Photography — Photographic-grade chemicals — Test methods — Part 6: Determination of halide content. This part of ISO 10349 specifies a laboratory test method for determining the halide content (reported as chloride ions, Cl−) in photographic-grade chemicals using a comparative turbidity reaction with silver nitrate and Nessler colour-comparison cylinders.

Abstract

The test method is based on weighing a test portion, dissolving it in water, transferring a 20 ml aliquot to a beaker, preparing and comparing it against a halide standard (A or B), adding nitric acid and silver nitrate to precipitate halide as a turbidity, diluting, transferring treated solutions into Nessler colour-comparison cylinders and observing turbidity to determine halide content (reported as chloride ions).

General information

• Status: Published — confirmed (reviewed and confirmed as current by ISO in 2023).
• Publication date: 1992-12 (publication recorded 30 December 1992 in commercial catalogues).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 37.040.30 (Photography — photographic chemicals / test methods).
• Edition / version: Edition 1 (1992).
• Number of pages: 2 pages (short procedural part).

Scope

Specifies a general laboratory procedure for the determination of halide (expressed as chloride ions) in photographic-grade chemicals. The method describes sample preparation, preparation of halide standard solutions (A and B), reagents (including nitric acid and silver nitrate), reaction procedure, use of Nessler colour-comparison cylinders and turbidity observation, and calculation/reporting of results appropriate for quality control of photographic chemicals.

Key topics and requirements

• Preparation and use of halide standard solutions (standard A and B) with specified concentrations for comparative testing.
• Weighing and dissolution of the test portion and transfer of a 20 ml aliquot for analysis.
• Addition of nitric acid and silver nitrate to produce a halide precipitate and controlled dilution prior to comparison.
• Use of Nessler colour-comparison cylinders and visual turbidity comparison to determine halide level (qualitative/semiquantitative procedure reported as mg Cl−).
• Reporting of results as chloride ions (Cl−); notes that some related standards may report halide as salts if required.

Typical use and users

Intended primarily for manufacturers and quality-control laboratories of photographic chemicals and related suppliers who require a simple, standardized method to check halide contamination levels. Also used by testing laboratories, standards bodies and technical committees involved in photographic chemistry and raw-material conformity. The method is a practical QC test rather than a high-precision instrumental technique.

Related standards

ISO 10349 is a multipart series covering test methods for photographic-grade chemicals; related parts include methods for insoluble matter, residue after ignition, heavy metals and iron, alkalinity/acidity, volatile matter, reaction to ammoniacal silver nitrate, sulfide content, and other analytical checks (e.g., ISO 10349-1 through ISO 10349-9 as published in the series). Users commonly consult adjacent parts of ISO 10349 for complementary test procedures.

Keywords

ISO 10349-6, photographic chemicals, halide content, chloride, test method, silver nitrate, Nessler cylinder, turbidity comparison, quality control, ISO/TC 42.

FAQ

Q: What is this standard?

A: ISO 10349-6:1992 is Part 6 of the ISO 10349 series and specifies a laboratory test method for determination of halide content (reported as chloride ions) in photographic-grade chemicals.

Q: What does it cover?

A: It covers sample preparation, halide standard solutions, required reagents (notably nitric acid and silver nitrate), the comparative turbidity procedure using Nessler colour-comparison cylinders, and calculation/reporting of halide as Cl−. The procedure is comparative/visual rather than instrumental.

Q: Who typically uses it?

A: Photographic-chemical manufacturers, QC and analytical laboratories, testing services and technical committees working in photographic materials and chemical quality assurance.

Q: Is it current or superseded?

A: The 1992 edition (Edition 1) remains published and was reviewed and confirmed by ISO in 2023, so it is currently listed as confirmed (not withdrawn or superseded as of the latest ISO review).

Q: Is it part of a series?

A: Yes — ISO 10349 is a multipart series of test methods for photographic-grade chemicals; Part 6 is the halide determination method and other parts address complementary tests such as insoluble matter, heavy metals, alkalinity/acidity, volatile matter, and others.

Q: What are the key keywords?

A: Halide, chloride, photographic-grade chemicals, silver nitrate, Nessler colour-comparison, turbidity, ISO 10349, test method, quality control.