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//ISO 7888:1985

ISO 7888:1985

Name: ISO 7888:1985 — Water quality — Determination of electrical conductivity
SKU: ISO 7888:1985
Price: 25 EUR
Availability: InStock

Water quality — Determination of electrical conductivity

Название (английский):

ISO 7888:1985

Water quality — Determination of electrical conductivity

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 16 мая 1985 г.
Издание:: ISO IS 7888 edition 1 version 1
ICS:: 13.060.60

Тип поставки:

Full version25 €Ask AI2 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 рабочий день

Цена:25 €

Описание (английский):

Specifies a method for the measurement of all types of water. The quantity can be used to monitor the quality of surface waters, process waters in water supply and treatment plants, and waste waters. Interferences are given.

Abstract

Overview

ISO 7888:1985, titled Water Quality - Determination of Electrical Conductivity, is an international standard developed by the International Organization for Standardization (ISO). This standard specifies a precise method for measuring the electrical conductivity of all types of water. It serves as a critical tool for monitoring water quality in various contexts including surface waters, water supply distribution, treatment plants, and wastewater.

Key Topics

Scope and Application: The standard applies to all types of water-surface, process, and wastewater-to assess ion concentration and overall water quality.
Measurement Principles:
- Electrical conductivity is the inverse of resistance and indicates ionic solute concentration.
- Conductivity is measured using specialized instruments equipped with conductivity cells.
- The cell constant, based on electrode geometry, must be carefully determined for precise readings.
Temperature Compensation:
- Conductivity varies with temperature; therefore, measurements must be corrected to a reference temperature of 25°C for comparability.
- The standard describes mathematical correction formulas and factors to adjust conductivity values from actual measurement temperatures to the reference temperature.
Calibration and Standards:
- Calibration uses potassium chloride (KCl) standard solutions of known conductivity.
- The document recommends specific cell constants based on the expected conductivity range to optimize measurement sensitivity.
Equipment Requirements:
- Instruments include flow-through or immersion cells with multiple electrodes or induction electrodes.
- Electrode maintenance, including platinization, is highlighted to ensure accuracy.
- Temperature measuring devices must be precise to at least ±0.1°C for reliable correction.
Sampling Procedures:
- Samples should be collected in polyethylene bottles, avoiding glass to reduce contamination.
- Prompt measurement is recommended to avoid changes caused by biological activity or gas exchange.
Interferences and Limitations:
- Contaminants such as suspended solids, oils, or air bubbles on electrodes can impact results.
- The presence of gases like carbon dioxide or ammonia can influence conductivity, especially at low values (<1 mS/m).

Applications

ISO 7888 is pivotal in water quality analysis and management, benefiting:

Environmental Monitoring:
- Assessment of lakes, rivers, and surface water bodies to track pollution and ionic content fluctuations.
Water Supply and Treatment Plants:
- Monitoring raw and treated water quality to ensure safety and regulatory compliance.
Wastewater Management:
- Controlling process waters and effluents for effective treatment and discharge standards adherence.
Research and Laboratory Analysis:
- Consistent, standardized electrical conductivity measurement supports scientific investigations into water chemistry.
Field Testing:
- Portable instruments following ISO 7888 procedures enable onsite water quality checks with temperature correction protocols.

Related Standards

ISO 6107-2: Definitions related to water quality and measurement quantities, including electrical conductivity terminology.
ISO 31-5: General symbols and units for physical quantities, including conductivity units.
Other ISO/TC 147 Standards: Cover additional water quality parameters and testing methods, often used in conjunction with ISO 7888 for comprehensive analysis.

Summary

ISO 7888:1985 provides a detailed, standardized methodology for accurate determination of water electrical conductivity, critical for assessing water ionic content and overall quality. It emphasizes precision through calibration, temperature correction, and proper sampling, addressing potential interferences. This standard is extensively used by environmental agencies, water utilities, laboratories, and field operators to ensure consistent, reliable water quality measurements worldwide. By adhering to ISO 7888, stakeholders can effectively monitor water integrity, comply with regulatory frameworks, and support sustainable water resource management.

Keywords: ISO 7888, water quality, electrical conductivity, water monitoring, water testing standards, conductivity measurement, temperature compensation, water treatment, surface water analysis, wastewater quality.

Технические детали

Технический комитет: ISO/TC 147/SC 2 - Physical, chemical and biochemical methods
SKU: ISO 7888:1985

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PDF

ISO 7888:1985

Abstract

Overview

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Key Topics

Applications

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Summary

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