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//ISO 422:1994

ISO 422:1994

Name: ISO 422:1994 — Photography — Processing chemicals — Specifications for p-methylaminophenol sulfate
SKU: ISO 422:1994
Price: 25 EUR
Availability: InStock

Photography — Processing chemicals — Specifications for p-methylaminophenol sulfate

Название (английский):

ISO 422:1994

Photography — Processing chemicals — Specifications for p-methylaminophenol sulfate

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 20 октября 1994 г.
Издание:: ISO IS 422 edition 2 version 1
ICS:: 37.040.30

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Цена:25 €

Описание (английский):

Cancels and replaces the first edition (1976). Lays down criteria for the purity of photographic-grade p-methylaminophenol sulfate and specifies the test methods to be used to determine the purity.

Abstract

Overview

ISO 422:1994 - Photography - Processing chemicals - Specifications for p‑methylaminophenol sulfate - defines purity criteria and test methods for photographic‑grade (HOC6H4NHCH3·½H2SO4). This second edition (1994) cancels the 1976 first edition and specifies chemical and physical requirements, sampling, and analytical procedures to ensure material suitability for photographic processing solutions.

Key topics and requirements

The standard sets mandatory limits and describes analytical methods. Principal technical topics include:

Assay (purity)
- Cerate titration: 99.0 % (m/m) min. and 102.0 % (m/m) max.
- Alkali titration: 97.5 % (m/m) min.
Identity tests
- Melting point of the nitroso derivative: 130 °C to 135 °C; mixed melting point must not be less than the sample or standard.
- Optional infrared (IR) spectrum to match a reference absorption curve.
Impurity and physical limits (Table summary)
- Residue after ignition: ≤ 0.10 % (m/m)
- Heavy metals (as Pb): ≤ 0.002 % (m/m) (ISO 10349‑5 methods)
- Iron (Fe): ≤ 0.005 % (m/m)
- Volatile matter: ≤ 0.3 % (m/m) (ISO 10349‑8 methods)
- p‑Aminophenol: ≤ 2.5 % (m/m) (UV spectrophotometry at 312 nm)
- Solubility in diethyl ether: ≤ 0.2 % (m/m)
- Appearance of solution: Clear, not more than slightly yellow
Analytical methods and apparatus
- Titrations (cerate, alkali), pH potentiometry, IR spectroscopy, UV spectrophotometry, residue‑after‑ignition, and heavy‑metal/iron determinations.
- Tests are performed on samples “as received” to reflect supplied material.
Handling and storage
- Store in a closed container at room temperature; follow laboratory safety (protective gloves, goggles). ISO 10349 series referenced for general test procedures and hazard codes.

Practical applications

Quality control and acceptance testing for photographic chemical manufacturers and suppliers.
Procurement specifications for photographic‑processing operations and R&D labs evaluating developer components.
Regulatory or compliance checks where defined purity prevents photographic defects (fogging, staining) or downstream process variability.

Who should use this standard

Chemical analysts and QC laboratories in photographic and imaging supply chains.
Manufacturers of photographic processing chemicals and formulators.
Technical procurement specialists and standards compliance officers in imaging industries.

Related standards

ISO 10349 series (Parts 1, 4, 5, 8) - general test methods for photographic‑grade chemicals.
ISO 565 - test sieves referenced for IR sample preparation.

Keywords: ISO 422:1994, p‑methylaminophenol sulfate, photography processing chemicals, assay, cerate titration, alkali titration, residue after ignition, heavy metals limit, infrared spectrum, p‑aminophenol limit.

Технические детали

Технический комитет: ISO/TC 42 - Photography
SKU: ISO 422:1994

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Каталог

ISO 10349-5:1992

Действующий

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