ISO 10530-1992 PDF

Full title and description

ISO 10530:1992 — Water quality — Determination of dissolved sulfide — Photometric method using methylene blue. This International Standard specifies a lab procedure for measuring dissolved sulfide in water samples by forming methylene blue (measuring absorbance at 665 nm) after filtration, conservation and stripping of sulfide from the sample.

Abstract

The standard describes a photometric (colorimetric) method applicable to dissolved sulfide in the mass concentration range 0.04 mg/l to 1.5 mg/l. The procedure includes filtration to remove particulates, preservation of the filtrate, transfer/stripping of sulfide into a trapping solution, formation of leukomethylene blue which is oxidized to methylene blue, and measurement of absorbance at 665 nm. The method notes common non-interfering ions within specified limits and includes an annex on preparation/standardization of sulfide stock solution.

General information

• Status: Published (International Standard).
• Publication date: September 1992.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 13.060.50 (Examination of water for chemical substances); ISO/TC 147/SC 2 responsible committee.
• Edition / version: Edition 1 (1992).
• Number of pages: 9 pages (official published document length).

All items above are recorded in the ISO bibliographic entry for ISO 10530:1992.

Scope

ISO 10530:1992 applies to the determination of dissolved sulfide in waters (including certain wastewaters after filtration) in the mass concentration range 0.04 mg/l to 1.5 mg/l. It covers sampling considerations that lead to filtration, preservation of the filtrate, the chemical reactions used to convert sulfide to a measurable colored complex (methylene blue), and measurement of absorbance at 665 nm. The method specifies concentrations of several potentially interfering ions under which no interference is expected and notes that polysulfide-bound sulfides are not completely measured by this procedure.

Key topics and requirements

• Applicable concentration range: 0.04 mg/l to 1.5 mg/l (with dilution for higher concentrations).
• Sample preparation: filtration to remove suspended/insoluble sulfide fractions and preservation of filtrate (ascorbate or other preservative as specified).
• Analytical principle: stripping of dissolved sulfide, reaction with dimethyl-p-phenylenediamine (and zinc acetate trap) to form leukomethylene blue, oxidation to methylene blue and photometric measurement at 665 nm.
• Interference control: defined tolerances for ions such as cyanide, iodide, thiosulfate, thiocyanate and sulfite (specified limits where no significant interference occurs).
• Quality control: preparation/standardization of sulfide stock solutions (Annex A) and use of calibration standards and blanks.

These are the principal technical and procedural requirements set out by the standard.

Typical use and users

Laboratories performing routine water and wastewater chemical analyses, environmental monitoring bodies, municipal water authorities, effluent testing labs, and instrument manufacturers (spectrophotometer vendors) use this method as a standardized procedure for dissolved sulfide quantification where the methylene blue photometric technique is appropriate. It is suitable for regulatory compliance testing, process monitoring and research applications where the specified concentration range and sample types meet the method’s assumptions.

Related standards

ISO 10530 is part of the broader set of ISO water quality test standards produced under ISO/TC 147 and its subcommittees; related methods address other chemical analytes and alternative analytical techniques for sulfur species and general water chemistry (pH, conductivity, other ion determinations). National/adopted versions (translations or national publications) and other ISO water quality methods may be used alongside ISO 10530 where complementary analyses are required.

Keywords

dissolved sulfide, methylene blue, photometric method, colorimetric, water quality, sulfide determination, filtration, sample preservation, absorbance 665 nm, ISO 10530

FAQ

Q: What is this standard?

A: ISO 10530:1992 is an International Standard that specifies a photometric (methylene blue) method for the determination of dissolved sulfide in water samples.

Q: What does it cover?

A: It covers sample filtration and preservation, chemical conversion and trapping/stripping of sulfide, formation and measurement of the methylene blue complex at 665 nm, applicable concentration range (0.04–1.5 mg/l) and limits for common interfering ions, plus calibration/standardization guidance (Annex A).

Q: Who typically uses it?

A: Environmental and wastewater laboratories, regulatory monitoring agencies, municipal water labs and instrument/supply vendors that provide spectrophotometric methods and reagents for sulfide analysis.

Q: Is it current or superseded?

A: As of the latest ISO bibliographic record for this standard, ISO 10530:1992 remains a published International Standard and has been maintained in ISO’s catalogue review cycle (the ISO entry lists its published status and review history). Users should check the ISO catalogue or their national standards body for any subsequent revisions or national adoptions before use.

Q: Is it part of a series?

A: It is one of many ISO standards for water quality produced under ISO/TC 147 (water quality) and its subcommittees; it is related by subject matter to other ISO methods for chemical determinations in water but is a standalone method for dissolved sulfide by the methylene blue technique.

Q: What are the key keywords?

A: Dissolved sulfide; methylene blue; photometric/colorimetric; water quality; spectrophotometry; absorbance 665 nm; calibration; sample preservation; ISO 10530.