ISO 3622:1996 PDF
Photography — Processing chemicals — Specifications for ammonium thiocyanate
Название (английский):
ISO 3622:1996
Photography — Processing chemicals — Specifications for ammonium thiocyanate
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 7
- Дата публикации:
- 17 октября 1996 г.
- Издание:
- ISO IS 3622 edition 2 version 1
- ICS:
- 37.040.30
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Язык документа:
Срок поставки:2 раб. дн. (перевод)
Цена:105 €
Abstract
Overview
ISO 3622:1996 specifies purity, analytical test methods and acceptance criteria for ammonium thiocyanate (NH4SCN) used as a photography processing chemical. The standard defines chemical assays, contaminant limits, pH and visual acceptability for photographic-grade ammonium thiocyanate to ensure consistent performance in developers, fixers and other photographic solutions.
Key topics and technical requirements
- Assay (content): quantitative determination by argentimetric titration. Reagents include , , and a . Apparatus: and . Endpoint: permanent red. The assay is expressed using the conversion factor and the titration result (see standard for exact formula and variable definitions).
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