SIST EN 903:1997

Water quality - Determination of anionic surfactants by measurement of the methylene blue index MBAS (ISO 7875-1:1984 modified)

Under the experimental conditions, sulfonates and sulfates are the compounds chiefly measured, but some positive and negative interferences can occur (see clause 10). The method is applicable to drinking water, surface water as well as waste water, e.g. for the determination of the primary degradation of surfactants being under investigation in test systems containing natural or synthetic waste water. This applies for both laboratory scaled and technical waste water treatment plants.

Wasserbeschaffenheit - Bestimmung von anionischen oberflächenaktiven Stoffen durch Messung des Methylenblau-Index MBAS (ISO 7875-1:1984 modifiziert)

Unter den Versuchsbedingungen werden hauptsächlich Sulfate und Sulfonate bestimmt, jedoch können einige Störungen (Unter- und Überbefunde) auftreten; siehe Abschnitt 10. Das Verfahren ist anwendbar auf Trinkwasser, Oberflächenwasser sowie Abwasser, z.B. zur Bestimmung der Primärabbaubarkeit von oberflächenaktiven Stoffen in Testsysteme, die natürliches oder synthetisches Abwasser enthalten.

Qualité de l'eau - Dosage des agents de surface anioniques par mesurage de l'indice au bleu de méthylene SABM (ISO 7815-1:1984 modifiée)

Dans les conditions expérimentales, les composés de type sulfonates et sulfates sont principalement mesurés mais des interférences positives et négatives peuvent se produire (voir chapitre 10). La méthode est applicable aux eaux destinées à la consommation humaine, aux eaux de surface et aux eaux résiduaires, par exemple pour la détermination de la dégradation primaire des agents de surface dans des systèmes d'essai contenant des eaux résiduaires synthétiques ou naturelles.

Kakovost vode - Določanje anionskih površinsko aktivnih snovi z metilen modrim MBAS (ISO 7875-1:1984, modificiran)

General Information

• Status: Published
• Publication Date: 31-Jul-1997
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: KAV - Water quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Aug-1997
• Due Date: 01-Aug-1997
• Completion Date: 01-Aug-1997
• Directive: 2014-01-3849 - Pravilnik o prvih meritvah in obratovalnem monitoringu odpadnih voda
• Directive: TRRTP064 - Rules on initial measurements and operational monitoring of wastewater
• Ref Project: EN 903:1993 - Water quality - Determination of anionic surfactants by measurement of the methylene blue index MBAS (ISO 7875-1:1984 modified)

Overview

SIST EN 903:1997 is a European standard published by CEN that specifies the method for determining anionic surfactants in water by measuring the methylene blue index (MBAS). This method, based on the modified ISO 7875-1:1984, primarily targets sulfonates and sulfates, which are common anionic surfactants present in various water types including drinking water, surface water, and wastewater. The standard is essential for assessing water quality and monitoring surfactant degradation in both laboratory and industrial wastewater treatment settings.

Key Topics

• Anionic Surfactants Measurement: Focuses on quantifying anionic surfactants, particularly sulfonates and sulfates, through the MBAS method.
• Methylene Blue Index (MBAS): Utilizes the interaction between anionic surfactants and methylene blue dye to determine surfactant concentrations.
• Interferences and Limitations: Identifies potential positive and negative interferences affecting results, ensuring appropriate interpretation under various experimental conditions.
• Applicability: Applies to multiple water matrices such as drinking water, surface water, and technical or synthetic wastewater.
• Water Quality Control: Supports monitoring of primary degradation products of surfactants during wastewater treatment processes.

Applications

• Environmental Monitoring: Enables precise detection of anionic surfactants in natural aquatic environments to assess pollution levels.
• Drinking Water Safety: Ensures the quality of potable water by identifying unwanted anionic surfactants that may impact consumer health.
• Wastewater Treatment: Assists in evaluating the effectiveness of wastewater treatment plants by tracking surfactant breakdown and removal.
• Research and Development: Supports studies involving surfactant degradation and behavior in natural and synthetic water systems.
• Regulatory Compliance: Helps water utilities and environmental authorities comply with water quality regulations concerning surfactant levels.

Related Standards

• ISO 7875-1:1984 (modified under SIST EN 903:1997) – The foundational international standard for MBAS determination of anionic surfactants.
• EN 872 – For determination of non-purgeable organic carbon (NPOC) in water samples, complementary to surfactant analysis.
• EN 12260 – For determination of non-ionic surfactants, providing a broader framework for surfactant water quality analysis.
• ISO 5663 – Sampling standards applicable to water quality testing including surfactant analysis.

The SIST EN 903:1997 standard plays a critical role in ensuring accurate, reproducible measurement of anionic surfactants, supporting water quality assessment and environmental protection efforts. By adhering to this method, laboratories and treatment plants can maintain high standards for water safety and sustainability.

Standards Content (Sample)

SLOVENSKI STANDARD
01-avgust-1997
.DNRYRVWYRGH'RORþDQMHDQLRQVNLKSRYUãLQVNRDNWLYQLKVQRYL]PHWLOHQPRGULP
0%$6,62PRGLILFLUDQ
Water quality - Determination of anionic surfactants by measurement of the methylene
blue index MBAS (ISO 7875-1:1984 modified)
Wasserbeschaffenheit - Bestimmung von anionischen oberflächenaktiven Stoffen durch
Messung des Methylenblau-Index MBAS (ISO 7875-1:1984 modifiziert)
Qualité de l'eau - Dosage des agents de surface anioniques par mesurage de l'indice au
bleu de méthylene SABM (ISO 7815-1:1984 modifiée)
Ta slovenski standard je istoveten z: EN 903:1993
ICS:
13.060.50 3UHLVNDYDYRGHQDNHPLþQH Examination of water for
VQRYL chemical substances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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