EN ISO 5961:1995

Water quality - Determination of cadmium by atomic absorption spectrometry (ISO 5961:1994)

Specifies two methods for the determination of cadmium: using atomic absorption spectrometry (AAS) in an air-acetylene flame (aspiration of the acidified sample into the flame and measurement of the cadmium concentration at a wavelength of 228,8 nm) and by electrothermal atomization AAS (injection of the acidified sample into an electrically heated graphite tube of an electrothermal atomization atomic absorption spectrometer and measurement of the absorbance at a wavelength of 228,8 nm).

Bestimmung von Cadmium durch Atomabsorptionsspektrometrie (ISO 5961:1994)

In dieser Norm werden zwei Verfahren für die Bestimmung von Cadmium festgelegt:die Bestimmung von Cadmium mittels Atomabsorptionspektrometrie in der Flamme (AAS) (Abschnitt 2) und die elektrothermische Atomisierung (AAS) (Abschnitt 3).

Qualité de l'eau - dosage du cadmium par spectrométrie d'absorption atomique (ISO 5961:1994)

La présente Norme internationale prescrit deux méthodes de dosage du cadmium: par spectrométrie d'absorption atomique dans la flamme (section 2), et par spectrométrie d'absorption atomique avec atomisation électrothermique (section 3). 1.1.1 Dosage du cadmium dans une flamme air/acétylène Cette méthode s'applique à l'analyse des eaux et des eaux usées pour des concentrations de cadmium comprises entre 0,05 mg/l et 1 mg/l. Un dosage à de plus fortes concentrations est possible par dilution de l'échantillon. La gamme de travail de cette méthode peut être étendue à de plus faibles concentrations en procédant à une évaporation minutieuse de l'échantillon, préalablement acidifié à l'aide d'acide nitrique. Le cadmium peut être déterminé dans les boues et sédiments après une procédure de digestion appropriée évitant la formation d'un précipité. 1.1.2 Dosage du cadmium par atomisation électrothermique La méthode permet de doser le cadmium dans l'eau. Avec un volume de dosage de 10 µl, la gamme de concentration est comprise entre 0,3 µg/l et 3 µg/l. La gamme de concentration peut être étendue en diluant l'échantillon d'eau ou en utilisant de plus petits volumes de dosage. Le cadmium peut être dosé dans les boues et sédiments après une procédure adéquate de digestion.

Kakovost vode - Določanje kadmija z atomsko absorpcijsko spektrometrijo (ISO 5961:1994)

General Information

• Status: Published
• Publication Date: 26-Mar-1995
• ICS: 13.060.30 - Sewage water
• Technical Committee: CEN/TC 230 - Water analysis
• Drafting Committee: CEN/TC 230 - Water analysis
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-May-2008
• Completion Date: 21-May-2008
• Directive: 76/464/EEC - Pollution caused by certain dangerous substances discharged into the aquatic environment of the Community
• Mandate: M/BC/CEN/92/45 - Water analysis
• Ref Project: SIST EN ISO 5961:1996 - Water quality - Determination of cadmium by atomic absorption spectrometry (ISO 5961:1994)

Overview

EN ISO 5961:1995 is a crucial standard developed by CEN for assessing water quality through the precise determination of cadmium content. Cadmium is a toxic heavy metal with significant environmental and health risks, making its accurate measurement in water essential for safety and regulatory compliance. This standard outlines two validated atomic absorption spectrometry (AAS) methods to quantify cadmium concentration, ensuring reliable and reproducible results for laboratories and environmental monitoring bodies.

Key Topics

• Scope and Purpose
  EN ISO 5961 specifies two distinct atomic absorption spectrometry techniques for cadmium measurement in water samples, focusing on accuracy and sensitivity.

• Method 1: Flame AAS

  • Utilizes an air-acetylene flame to atomize the acidified water sample.
  • The cadmium concentration is measured at a wavelength of 228.8 nm.
  • Involves aspirating the acidified sample directly into the flame for atomic absorption analysis.

• Method 2: Electrothermal Atomization AAS

  • Employs a graphite furnace for electrically heating the atomizer.
  • Involves injection of the acidified sample into the graphite tube for atomization.
  • Measurement is performed at the same cadmium-specific wavelength of 228.8 nm.
  • This method provides higher sensitivity compared to flame AAS, ideal for lower cadmium concentrations.

• Analytical Precision
  Both methods emphasize stringent sample preparation, calibration, and measurement protocols to achieve accurate cadmium quantification.

• Wavelength Specificity
  The standardized wavelength of 228.8 nm is critical for detecting cadmium in the presence of interfering substances.

Applications

• Environmental Monitoring
  Monitoring cadmium levels in surface water, groundwater, and treated wastewater to assess pollution and compliance with environmental directives.

• Water Quality Assessment
  Used by municipalities and water treatment facilities to ensure potable water meets safety standards with respect to cadmium contamination.

• Industrial Effluent Testing
  Evaluation of waste discharges from industries such as mining, metal plating, and manufacturing to control cadmium pollution.

• Research and Laboratory Analysis
  Enables environmental laboratories and researchers to quantify cadmium accurately for studies related to toxicology, ecology, and water chemistry.

• Regulatory Compliance
  Supports adherence to national and international water quality regulations by providing standardized test methods recognized across Europe and globally.

Related Standards

• ISO 8288 – General guidance on water quality sampling and preservation techniques, complementing sample handling prior to cadmium analysis.

• EN ISO 11466 – Soil quality determination of trace elements including cadmium via digestion methods, which may precede water extraction analysis.

• ISO 11885 – Water quality-determination of selected elements by inductively coupled plasma atomic emission spectrometry (ICP-AES), an alternative technique for metal analysis.

• EN ISO 15586 – Water quality determination of mercury content, relevant due to similar heavy metal monitoring requirements.

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Keywords: EN ISO 5961, cadmium determination, atomic absorption spectrometry, AAS, water quality standard, electrothermal atomization, flame atomic absorption, heavy metal analysis, environmental monitoring, water testing methods, CEN standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-1996
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Water quality - Determination of cadmium by atomic absorption spectrometry (ISO
5961:1994)
Bestimmung von Cadmium durch Atomabsorptionsspektrometrie (ISO 5961:1994)
Qualité de l'eau - dosage du cadmium par spectrométrie d'absorption atomique (ISO
5961:1994)
Ta slovenski standard je istoveten z: EN ISO 5961:1995
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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