ISO 7766:2003 PDF

Name: ISO 7766:2003 — Processing photographic wastes — Analysis of cyanides — Determination of hexacyanoferrate (II) and hexacyanoferrate (III) by spectrometry
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Processing photographic wastes — Analysis of cyanides — Determination of hexacyanoferrate (II) and hexacyanoferrate (III) by spectrometry

Название (английский):

ISO 7766:2003

Processing photographic wastes — Analysis of cyanides — Determination of hexacyanoferrate (II) and hexacyanoferrate (III) by spectrometry

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 19 июня 2003 г.
Издание:: ISO IS 7766 edition 1 version 1
ICS:: 13.030.30

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Описание (английский):

ISO 7766:2003 establishes a test method for the determination of hexacyanoferrate(II) (ferrocyanide) and hexacyanoferrate(III) (ferricyanide), referred to hereafter as Fe(CN)6, in photographic processing effluents. Results are reported as hexacyanoferrate, Fe(CN)6.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7766:2003, "Processing photographic wastes - Analysis of cyanides - Determination of hexacyanoferrate(II) and hexacyanoferrate(III) by spectrometry," specifies a laboratory test method for measuring complexed cyanides (hexacyanoferrate, Fe(CN)6) in photographic processing effluents. The method reports results as total hexacyanoferrate and is intended to support environmental compliance and internal monitoring of photographic wastewater.

Key topics and requirements

Analytical principle: Addition of a mixed iron(II)/iron(III) reagent to an effluent sample produces a characteristic blue suspension whose absorbance is proportional to Fe(CN)6 concentration. Absorbance is measured by spectrometry and concentration determined from calibration.

Measurement range and instrumentation: The method is linear and stable in the 1.0–10.0 mg/L Fe(CN)6 range. A spectrometer capable of absorbance measurement (notably at around 700 nm) and 1 cm optical path cuvettes are specified.

Reagents and standards: Includes preparation of a ferrous–ferric reagent, potassium ferrocyanide standard solution (fresh daily), hydrochloric acid (1 mol/L), and sodium hydroxide solution. Reagent-grade chemicals and distilled (or equivalent) water are required.

Sampling and sample prep: Sampling must be representative (follow ISO 5667 guidance). Typical sample handling includes dilution, alkalization, filtration, acidification and parallel aliquots for test and blank. Glassware pretreatment with 1 mol/L HCl and careful labelling of reagents are required.

Safety and quality: Strong emphasis on chemical hazards (caustic/toxic reagents). Critical safety warning: all pipetting must use a bulb or plunger; digestion steps in a fume hood. Reagent purity and equipment calibration affect reliability.

Practical applications and users

Environmental compliance testing of photographic laboratories and processing plants to quantify complexed cyanides in wastewater.

On-site or third-party analytical laboratories performing cyanide speciation and effluent monitoring.

Wastewater treatment engineers assessing the load of complexed cyanides and designing pretreatment or neutralization steps.

Manufacturers and formulators of photographic chemicals who need to monitor by-products in process effluents.

Benefits: provides a targeted, spectrometric method for hexacyanoferrate (ferrocyanide/ferricyanide) determination, enabling consistent reporting and easier compliance with discharge regulations.

Related standards

ISO 5667-1/2/3 (sampling guidance for water and effluents)

ISO 6703-1 and ISO 6703-2 (general cyanide determination methods)

ISO 6353 series (reagent quality) and ISO 10349-1 (volumetric glassware/photographic-grade chemicals)

Keywords: ISO 7766:2003, hexacyanoferrate, ferrocyanide, ferricyanide, photographic processing effluents, spectrometry, cyanide analysis, photographic wastes, wastewater monitoring.

ISO 7766:2003 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications and users

Related standards

Технические детали

BS ISO 5667-21:2010

Water quality. Sampling - Guidance on sampling of drinking water distributed by tankers or means other than d…

SIST ISO 6703-1:1996

Water quality -- Determination of cyanide -- Part 1: Determination of total cyanide

SIST ISO 6703-2:1996

Water quality -- Determination of cyanide -- Part 2: Determination of easily liberatable cyanide

ISO 6353-2:1983/Add 2:1986

Reagents for chemical analysis — Part 2: Specifications — First series — Addendum 2

ISO 10349-1:1992

Photography — Photographic-grade chemicals — Test methods — Part 1: General