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ISO 3619:1994 PDF — Photography — Processing chemicals — Specifications for ammonium thio… — GOST Standards

//ISO 3619:1994

ISO 3619:1994

Name: ISO 3619:1994 — Photography — Processing chemicals — Specifications for ammonium thiosulfate solution
SKU: ISO 3619:1994
Price: 25 EUR
Availability: InStock

Photography — Processing chemicals — Specifications for ammonium thiosulfate solution

Название (английский):

ISO 3619:1994

Photography — Processing chemicals — Specifications for ammonium thiosulfate solution

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 8 декабря 1994 г.
Издание:: ISO IS 3619 edition 2 version 1
ICS:: 37.040.30

Тип поставки:

Full version25 €Ask AI2 €Read online 24h10 €Read online 72h15 €

Язык документа:

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Срок поставки:1 рабочий день

Цена:25 €

Описание (английский):

Cancels and replaces the first edition (1976). Establishes criteria for the purity of photographic-grade ammonium thiosulfate solution and specifies the tests to be used to determine the purity.

Abstract

Overview

ISO 3619:1994 - "Photography - Processing chemicals - Specifications for ammonium thiosulfate solution" defines purity criteria and test methods for photographic‑grade ammonium thiosulfate solution. This second edition (1994) cancels :1976 and establishes mandatory limits and analytical procedures to ensure chemicals used in photographic processing do not produce undesirable photographic effects.

Key topics and technical requirements

The standard specifies chemical and physical limits, mandatory tests, and referenced methods (many from ISO 10349 series). Major requirements include:

Assay (as ammonium thiosulfate (NH4)2S2O3): 53.0% (m/m) minimum and 61.0% (m/m) maximum
Alkalinity (as NH4OH): 0.3% (m/m) minimum and 1.5% (m/m) maximum
Sulfite content (as (NH4)2SO3): maximum 1.0% (m/m)
Insoluble matter: maximum 0.2% (m/m) - determined as precipitate after treatment in ammonium hydroxide (ISO 10349‑3)
Residue after ignition: maximum 0.2% (m/m) (ISO 10349‑4)
Heavy metals (as Pb): maximum 0.001% (m/m) (ISO 10349‑5)
Iron (Fe): maximum 0.001% (m/m) (ISO 10349‑5)
Sulfide (as S2‑): maximum 0.00025% (m/m) (ISO 10349‑10)
Specific gravity / density at 20 °C: specific gravity 1.290–1.346 or density 1.284–1.340 g/ml (ISO 10349‑11 / ISO 10349‑12)

The standard prescribes titrimetric and gravimetric methods for assay and impurity testing, and requires tests be performed on samples “as received.” It also includes handling/storage guidance (store in closed container at room temperature; avoid mixing with strong acids/alkalis).

Applications and users

ISO 3619 is intended for:

Chemical manufacturers and suppliers producing photographic‑grade ammonium thiosulfate solution
Quality control and analytical laboratories performing purity testing and batch release
Photographic processors and labs that require assurance of chemical quality to avoid processing defects
Procurement specialists and standards officers specifying compliance requirements in supply contracts

Use of ISO 3619 helps reduce image defects, ensures consistent processing performance, and facilitates vendor qualification and regulatory compliance.

Related standards

ISO 3619 references and relies on test methods in the ISO 10349 series (Parts 1, 3, 4, 5, 10, 11, 12) for general procedures, insoluble matter, residue after ignition, heavy metals/iron, sulfide, and specific gravity/density determinations.

Keywords: ISO 3619:1994, ammonium thiosulfate solution, photographic‑grade, processing chemicals, purity criteria, assay, specific gravity, ISO 10349, quality control.