ISO 10359-1:1992

Name: ISO 10359-1:1992 — Water quality — Determination of fluoride — Part 1: Electrochemical probe method for potable and lightly polluted water
SKU: ISO 10359-1:1992
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Water quality — Determination of fluoride — Part 1: Electrochemical probe method for potable and lightly polluted water

Название (английский):

ISO 10359-1:1992

Water quality — Determination of fluoride — Part 1: Electrochemical probe method for potable and lightly polluted water

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 25 ноября 1992 г.
Издание:: ISO IS 10359 edition 1 version 1
ICS:: 13.060.20

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Описание (английский):

The method is based on developing a potential difference between the measuring electrode and the reference electrode, when a fluoride ion-selective electrode comes into contact with an aqueous solution containing fluoride ions. On certain assumptions specified, the method will no longer refer to activities, but to fluoride ion concentration. The method is directly suitable for measuring fluoride concentrations from 0,2 mg/l to 2,0 g/l.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 10359-1:1992 specifies an electrochemical probe method for the determination of dissolved fluoride in potable and lightly polluted waters. The technique uses a fluoride ion‑selective electrode (F‑ISE) and a reference electrode to measure the potential difference proportional to fluoride ion concentration. The method is directly suitable for fluoride concentrations from 0.2 mg/L to 2 000 mg/L (2.0 g/L) and, after concentration enhancement, can detect levels down to about 0.02 mg/L.

Key topics and requirements

Principle: Potential difference between F‑ISE and reference electrode follows the Nernst relationship; measurements refer to fluoride ion concentration under defined assumptions.

Measurement range & sensitivity: 0.2 mg/L–2 000 mg/L directly; lower limits achievable by spiking/concentration procedures.

pH control and interferences:

Buffer samples to pH 5–7 (recommended pH ~5.2) to avoid HF formation and hydroxide interference.
Use a Total Ionic Strength Adjustment Buffer (TISAB) containing CDTA to decomplex Ca2+, Mg2+, Al3+, Fe3+; note boron‑fluoride complexes (BF4−) are not decomplexed by this buffer.

Instrumentation & reagents:

High‑impedance millivolt meter (≥10^12 Ω) resolving 0.1 mV.
Fluoride ion‑selective electrode with slope ≥55 mV per decade at 25 °C and a calomel or Ag/AgCl reference electrode.
Thermostatted measuring cell (25 °C ±0.2 °C), magnetic stirrer, membrane filtration (0.45 μm) optional.
Standard solutions (stock 1000 mg/L NaF and working standards, e.g. 10, 5, 1, 0.5, 0.2 mg/L) and TISAB prepared as specified.

Calibration & procedure: Establish a five‑point calibration (semi‑log graph or Nernst equation), condition and recondition electrodes to avoid memory effects, maintain consistent ionic strength and temperature.

Sampling & handling: Collect in fluoride‑free polyethylene bottles, analyze preferably within 3 days; no preservative normally required.

Applications

Routine monitoring of drinking water and surface water fluoride levels.

Compliance testing for water quality programs and regulatory reporting.

Environmental laboratory analysis, public utilities, and research where electrochemical fluoride measurement is appropriate.

Rapid field or laboratory screening for fluoride in potable and lightly polluted waters.

Related standards

ISO 10359-2 - Determination of total inorganically bound fluoride (decomposition/distillation + potentiometry)

ISO 5667-3 - Water quality - Sampling - Guidance on preservation and handling of samples

Keywords: ISO 10359-1:1992, fluoride determination, water quality, fluoride ion‑selective electrode, electrochemical probe method, TISAB, potable water testing.

ISO 10359-1:1992

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

Технические детали

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