SIST EN ISO 15923-1:2025 PDF

Overview

SIST EN ISO 15923-1:2025 – "Water quality - Determination of selected parameters by discrete analysis systems - Part 1: Ammonium, nitrate, nitrite, chloride, orthophosphate, sulfate and silicate with photometric detection" – is an important European standard developed by CEN and ISO for water quality testing. This standard specifies automated spectrophotometric and turbidimetric analysis methods using discrete analysis systems for determining specific ions and compounds in water. The scope covers a wide range of water types, including ground, potable, surface, waste, eluates, and boiler water, enabling high-throughput and reliable assessment of key water quality parameters.

The implementation of SIST EN ISO 15923-1:2025 supports consistent, reproducible, and efficient analytical workflows in environmental monitoring, utility operation, and industrial processes.

Key Topics

• Target Parameters: The standard addresses the determination of ammonium, nitrate, nitrite, chloride, orthophosphate, sulfate, and silicate in water samples.
• Analytical Technique: Utilizes discrete analysis systems-automated instruments performing photometric (colorimetric) and turbidimetric measurements in individual reaction cells.
• Sample Types: Applicable to various water matrices, including:
  • Drinking water
  • Groundwater
  • Surface water
  • Wastewater
  • Eluates from solid materials
  • Boiler water
• Measurement Principle: Chemical reactions produce a color or turbidity proportional to the concentration of the analyte; absorbance or turbidity is measured automatically.
• Calibration & Quality Control: Requires appropriate calibration with standard solutions, regular validity checks, and use of control standards to ensure accuracy.
• Sample Preparation: Recommends filtration (typically through 0.45 μm membranes) and proper blanking procedures to minimize interferences and enhance reliability.
• Interference Management: Provides guidance on addressing particulate interference, color and turbidity corrections, and sample pH adjustment.

Applications

SIST EN ISO 15923-1:2025 is widely used in:

• Environmental Monitoring: Regulatory and routine assessments of rivers, lakes, and groundwater for compliance with water quality directives.
• Drinking Water Analysis: Ensuring municipal and private water supplies meet safety and quality standards.
• Wastewater Treatment: Monitoring treatment efficiency by tracking nutrient and anion concentrations before discharge.
• Industrial Water Management: Controlling process water quality in manufacturing, energy, and chemical sectors.
• Boiler and Cooling Water: Preventing scaling and corrosion through regular analysis of key ions in system water.
• Research & Development: Supporting scientific studies on nutrient cycling, pollution, and water chemistry.

By automating multianalyte detection, this standard enables laboratories to improve throughput and reduce manual handling, while maintaining traceable, reproducible results in compliance with regulatory and quality system requirements.

Related Standards

Implementing SIST EN ISO 15923-1:2025 often requires reference to or integration with other water analysis standards, including:

• ISO 3696: Water for analytical laboratory use – Specification and test methods
• ISO 5667-3: Water quality – Sampling – Part 3: Preservation and handling of water samples
• ISO 8466-1/ISO 8466-2: Water quality – Calibration and evaluation of analytical methods and estimation of performance characteristics
• ISO 7150-1, ISO 6777, ISO 13395: Standards for specific colorimetric methods for ammonium, nitrite, and nitrate
• ISO 5663: Digestion procedure for total nitrogen analysis

SIST EN ISO 15923-1:2025 is foundational for laboratories seeking consistency, automation, and compliance in essential water quality parameter testing using discrete analysis technology and photometric detection. Adherence to this standard supports environmental stewardship, public health, and industrial process control.