ISO 10530:1992 PDF

Water quality — Determination of dissolved sulfide — Photometric method using methylene blue

Название (английский):

ISO 10530:1992

Water quality — Determination of dissolved sulfide — Photometric method using methylene blue

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 9 сентября 1992 г.
Издание:: ISO IS 10530 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

The specified method is applicable to sulfide determination in a mass concentration range from 0,04 mg/l to 1,5 mg/l. The following ions do not interfere in specified mass concentrations: cyanide, iodide, thiosulfate, thiocyanate, sulfite. The principle is filtration, conservation of the sulfide in the filtrate, stripping of the sulfides, formation of leukomethylene blue, measurement of the absorbance of this complex at a wavelength of 665 nm. Annex A describes standardization of sulfide stock solution.

Технические детали

Технический комитет: ISO/TC 147/SC 2 - Physical, chemical and biochemical methods
SKU: ISO 10530:1992

Abstract

Overview

ISO 10530:1992 specifies a photometric method using methylene blue for the determination of dissolved sulfide in water. The standard covers filtration and preservation, stripping of sulfide into a zinc acetate absorber, formation of leukomethylene blue and oxidation to methylene blue, and photometric measurement at 665 nm. The method is applicable to natural and waste waters requiring filtration and is designed for a mass concentration range of 0.04 mg/L to 1.5 mg/L (higher concentrations by dilution).

Keywords: ISO 10530, dissolved sulfide, methylene blue method, water quality, photometric method, 665 nm.

Key topics and requirements

Scope and range
- Target range: 0.04–1.5 mg/L sulfide as S (extendable by dilution).
- Not suitable for waters that cannot be filtered as specified.
Analytical principle
- Filtration → conserve sulfide with ascorbate (pH 10) → strip with nitrogen → absorb into zinc acetate → react with N,N-dimethyl-p-phenylendiamine (colour-forming reagent) + ammonium iron(III) sulfate → measure absorbance at 665 nm.
Interferences (non-significant up to stated concentrations)
- Cyanide ≤ 2 mg/L, Iodide ≤ 20 mg/L, Thiosulfate ≤ 900 mg/L, Thiocyanate ≤ 900 mg/L, Sulfite ≤ 700 mg/L.
- Carbon disulfide

Overview

Keywords: ISO 10530, dissolved sulfide, methylene blue method, water quality, photometric method, 665 nm.

Key topics and requirements

Scope and range
- Target range: 0.04–1.5 mg/L sulfide as S (extendable by dilution).
- Not suitable for waters that cannot be filtered as specified.
Analytical principle
- Filtration → conserve sulfide with ascorbate (pH 10) → strip with nitrogen → absorb into zinc acetate → react with N,N-dimethyl-p-phenylendiamine (colour-forming reagent) + ammonium iron(III) sulfate → measure absorbance at 665 nm.
Interferences (non-significant up to stated concentrations)
- Cyanide ≤ 2 mg/L, Iodide ≤ 20 mg/L, Thiosulfate ≤ 900 mg/L, Thiocyanate ≤ 900 mg/L, Sulfite ≤ 700 mg/L.
- Carbon disulfide

ISO 10530:1992 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

Overview

Key topics and requirements

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