ISO 6439:1990 PDF

Name: ISO 6439:1990 — Water quality — Determination of phenol index — 4-Aminoantipyrine spectrometric methods after distillation
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Water quality — Determination of phenol index — 4-Aminoantipyrine spectrometric methods after distillation

Название (английский):

ISO 6439:1990

Water quality — Determination of phenol index — 4-Aminoantipyrine spectrometric methods after distillation

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 24 мая 1990 г.
Издание:: ISO IS 6439 edition 2 version 1
ICS:: 13.060.50

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Описание (английский):

Gives procedures for drinking waters, surface waters, brines (saline waters), domestic waters and industrial waters. After a preliminary distillation the test sample are analysed according to specific application by direct colorimetric method and by chloroform extraction method.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO 6439:1990 - "Water quality - Determination of phenol index - 4‑Aminoantipyrine spectrometric methods after distillation" specifies standardized laboratory procedures to determine the phenol index in waters. The methods apply to drinking water, surface water, brines (saline waters), domestic waters and industrial waters. After a preliminary distillation, sampled phenolic compounds are measured either by a direct colorimetric method (Method A) or by a chloroform extraction/concentration method (Method B) using the 4‑aminoantipyrine reaction and spectrometric measurement at ~510 nm. Results are reported as milligrams of phenol per litre (mg/L phenol).

Key topics and technical requirements

Scope: Phenol index measurement in various water types after steam distillation.

Two methods:

Method A (Direct colorimetric): suitable for samples with >0.10 mg/L phenol in the aqueous phase (no chloroform extraction).
Method B (Chloroform extraction): concentrates colored product into chloroform phase; extends measurement range down to about 0.002–0.10 mg/L (practical detection limits noted around 0.01 mg/L in practice).

Chemical reaction: steam‑distillable phenolic compounds react with 4‑aminoantipyrine and potassium hexacyanoferrate(III) at pH ~10 to form a red antipyrine dye measured spectrometrically at ~510 nm.

Sample preservation & interferences:

Acidify and add copper(II) sulfate at sampling to inhibit biological degradation and prevent sulfide formation.
Remove oxidizing agents (e.g., ascorbic acid addition), manage oils/tar and sulfur compounds, and consider amine or reducing‑agent interferences.

Apparatus & reagents: all‑glass distillation setup, spectrometer (10–100 mm cell path), pH meter; use analytical‑grade reagents and specified standard phenol solutions.

Expression of results: interpolate absorbance on a calibration graph and convert to mg/L phenol equivalent.

Practical applications

Routine laboratory testing of water quality for environmental monitoring, wastewater treatment control, industrial effluent testing and compliance checks where a phenol index is required.

Useful for laboratories needing an ISO‑referenced spectrometric procedure for phenol determination after distillation and for comparative studies of phenolic contamination in different water matrices.

Related standards

ISO 5667 series (sampling guidance): ISO 5667‑1, ISO 5667‑2, ISO 5667‑3 - referenced for sampling, preservation and handling prior to analysis.

Keywords: ISO 6439:1990, phenol index, 4‑aminoantipyrine spectrometric methods, water quality, phenol determination, distillation, chloroform extraction, spectrophotometer, drinking water testing.

ISO 6439:1990 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

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