ISO 7890-1-1986 PDF

Full title and description

Water quality — Determination of nitrate — Part 1: 2,6-Dimethylphenol spectrometric method. This International Standard specifies a spectrometric procedure using 2,6-dimethylphenol for the determination of nitrate in potable and raw waters, with stated ranges and detection limits for nitrate-nitrogen.

Abstract

The standard describes a direct spectrometric method using 2,6-dimethylphenol applicable to potable and raw waters. The method covers nitrate-nitrogen concentrations in the test portion up to about 25 mg/l and reports a limit of detection near 0.06 mg/l (as nitrate nitrogen) under the specified conditions. The procedure and performance characteristics (range, detection limit, intended sample types) are summarized in the original ISO abstract.

General information

• Status: Withdrawn.
• Publication date: January 1986 (Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 13.060.50 (Examination of water for chemical substances).
• Edition / version: Edition 1 (1986).
• Number of pages: 5 pages (as published).

Scope

Specifies a spectrometric test method using 2,6-dimethylphenol for determining nitrate in potable and raw waters. The published procedure is intended for direct analysis of such waters within the stated concentration range and detection limit; it defines test-portion sizes, reagent treatment and the measurement technique necessary to obtain reproducible results. (Note: the standard has been withdrawn from ISO catalogues.)

Key topics and requirements

• Analytical principle: formation of a coloured derivative with 2,6-dimethylphenol and spectrometric measurement.
• Applicable sample types: potable and raw (surface/ground) waters — direct analysis within specified ranges.
• Performance characteristics: covers nitrate-nitrogen up to ~25 mg/l in the test portion and reports a detection limit near 0.06 mg/l (as nitrate-nitrogen).
• Requirements for reagents, calibration, blank corrections and control of potential interferences (as detailed in the published procedure).
• Specification of test portion sizes, optical cell/path length and recommended spectrometer settings to achieve the stated sensitivity and linear range.

Typical use and users

Environmental and analytical chemistry laboratories, water utility testing labs, regulatory agencies and consultants evaluating nitrate in drinking-water and raw water supplies. Typically used where a spectrometric colorimetric method is acceptable and where laboratory equipment and reagents for the 2,6-dimethylphenol reaction are available. Due to its withdrawn status, current laboratories commonly reference newer or confirmed methods for routine compliance testing.

Related standards

Other parts of the ISO 7890 series address alternative spectrometric procedures: Part 2 (4-fluorophenol spectrometric method after distillation) and Part 3 (sulfosalicylic acid spectrometric method). These parts and related water-quality analytical standards from ISO/TC 147 cover complementary methods and concentration ranges.

Keywords

nitrate, nitrate-nitrogen, water quality, spectrometric method, 2,6-dimethylphenol, ISO 7890-1, potable water, raw water, analytical chemistry, ISO/TC 147.

FAQ

Q: What is this standard?

A: ISO 7890-1:1986 is an International Standard titled "Water quality — Determination of nitrate — Part 1: 2,6-Dimethylphenol spectrometric method", specifying a spectrometric colorimetric procedure for nitrate determination in potable and raw waters.

Q: What does it cover?

A: The standard covers the reagent reaction (2,6-dimethylphenol), measurement by spectrometry, recommended test-portion sizes and performance characteristics (range up to ~25 mg/l nitrate-nitrogen and a detection limit around 0.06 mg/l under specified conditions).

Q: Who typically uses it?

A: Environmental and water-analysis laboratories, water suppliers, regulators and consultants historically used this method for nitrate screening when the method matched their required range and instrumentation. Today users normally consult current standards or confirmed ISO methods because this part has been withdrawn.

Q: Is it current or superseded?

A: ISO 7890-1:1986 is listed as withdrawn in the ISO catalogue. Users should check current ISO publications or national adoption documents for the preferred, current method(s) for nitrate analysis.

Q: Is it part of a series?

A: Yes — it is part of the ISO 7890 series on nitrate determination. Companion parts include ISO 7890-2:1986 (4-fluorophenol method after distillation) and ISO 7890-3:1988 (sulfosalicylic acid method), which cover different sample types, treatment steps and detection ranges.

Q: What are the key keywords?

A: Nitrate, nitrate-nitrogen, 2,6-dimethylphenol, spectrometric/colorimetric method, water quality, potable water, raw water, ISO 7890.