ISO 7890-3:1988 PDF

Name: ISO 7890-3:1988 — Water quality — Determination of nitrate — Part 3: Spectrometric method using sulfosalicylic acid
SKU: ISO 7890-3:1988
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Water quality — Determination of nitrate — Part 3: Spectrometric method using sulfosalicylic acid

Название (английский):

ISO 7890-3:1988

Water quality — Determination of nitrate — Part 3: Spectrometric method using sulfosalicylic acid

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 24 ноября 1988 г.
Издание:: ISO IS 7890 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

Procedure given is applicable to raw and potable water. The range covers a nitrat nitrogen concentration up to 0,2 mg/l using the maximum test portion of 25 ml. Using cells of path length 40 mm and a 25 ml test portion the limit of detection lies within the range 0,003 to 0,013 mg/l.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7890-3:1988 specifies a standardized spectrometric method using sulfosalicylic acid for the determination of nitrate concentration in raw and potable water. This internationally recognized procedure provides accurate measurement of nitrate nitrogen levels up to 0.2 mg/L with a detection limit ranging from 0.003 to 0.013 mg/L when using a 25 ml test portion and 40 mm path length cells. The standard plays a critical role in monitoring water quality by ensuring safe nitrate levels, essential for public health and environmental protection.

Key Topics

Scope and Sample Types Applicable to raw and potable water samples, ISO 7890-3 enables precise nitrate quantification in a broad range of water qualities, including slightly colored or suspended samples, given proper sample preparation and correction.

Detection Range and Sensitivity The method reliably detects low nitrate concentrations between 0.003 and 0.013 mg/L nitrogen using spectrometric absorbance at 415 nm.

Principle of the Method Nitrate ions react with sulfosalicylic acid in an acidic medium after an alkali treatment, forming a yellow compound measurable via spectrometry. Additives like disodium ethylenediaminetetraacetate (Na2EDTA) prevent precipitation of interfering salts, while sodium azide neutralizes nitrite interference.

Interference and Corrections Potential interferences from substances such as chlorides, orthophosphates, magnesium, and manganese are identified and quantified, with detailed interference effects addressed in Annex A. Absorbance corrections compensate for sample coloration or turbidity to improve accuracy.

Reagents and Equipment The method requires high-purity analytical reagents, including sulfuric acid, acetic acid, sodium hydroxide, sodium azide, and sodium salicylate, plus a spectrometer capable of measurements at 415 nm with 40-50 mm cuvettes.

Calibration and Quality Control Calibration involves preparing a series of nitrate standard solutions to establish a linear absorbance curve versus nitrate mass. The standard outlines procedures for blank tests, sample preparation, and absorbance measurement to ensure repeatability and reproducibility.

Applications

ISO 7890-3:1988 is essential for:

Water Quality Monitoring Ensuring nitrate levels in drinking water and natural water sources meet safety regulations, preventing potential health risks such as methemoglobinemia.

Environmental Assessment Tracking nitrate contamination from agricultural runoff, wastewater discharge, or industrial sources in surface and groundwater.

Laboratory Standardization Harmonizing nitrate testing methods across water quality laboratories internationally, facilitating reliable data comparison and regulatory compliance.

Research and Development Studying nitrate dynamics and water treatment efficiency with a method offering sensitive and reproducible nitrate quantification.

Related Standards

ISO 7890 is a multipart series addressing nitrate determination in water:

ISO 7890-1: Spectrometric method using dimethyl-2,6-phenol

ISO 7890-2: Spectrometric method using fluoro-phenol after distillation

ISO 7890-3: Spectrometric method using sulfosalicylic acid (this part)

Complementary standards and methods for water quality parameters and chemical analysis include:

ISO/TC 147: Committee on water quality standards development

Other water quality standards for parameters like nitrite, phosphate, and heavy metals

Keywords: nitrate determination, water quality, ISO 7890-3, spectrometric method, sulfosalicylic acid, nitrate analysis, potable water testing, nitrate nitrogen detection, water contaminants, analytical procedure, water safety standards

ISO 7890-3:1988 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

SIST ISO 7890-3:1996

Water quality -- Determination of nitrate -- Part 3: Spectrometric method using sulfosalicylic acid

ISO 7890-1:1986

Water quality — Determination of nitrate — Part 1: 2,6-Dimethylphenol spectrometric method

ISO 7890-2:1986

Water quality — Determination of nitrate — Part 2: 4-Fluorophenol spectrometric method after distillation