ISO 17289:2014
Water quality - Determination of dissolved oxygen - Optical sensor method

Standard No.

ISO 17289:2014

Release Date

2014

Published By

International Organization for Standardization (ISO)

Latest

ISO 17289:2014

Scope

This International Standard specifies an optical method for the determination of dissolved oxygen in water using a sensor working on the basis of fluorescence quenching. Measurement can be made either as a concentration of oxygen in milligrams per litre, percentage saturation (% dissolved oxygen), or both. Depending on the instrument used, detection limits of 0,1 mg/l or 0,2 mg/l can be reached according to the manufacturer’s manual. Most instruments permit measurement of values higher than 100 %, i.e. supersaturation. NOTE Supersaturation is possible when the partial pressure of oxygen is higher than in air. Especially in case of strong algae growth, supersaturation up to 200 % and more is possible. If waters with a saturation higher than 100 % are measured, it is essential to make arrangements to prevent the outgassing of oxygen during the handling and measurement of the sample. Similarly, it is important that the transport of oxygen into the sample is prevented if the saturation is below 100 %. The method is suitable for measurements made in the field and for continuous monitoring of dissolved oxygen as well as measurements made in the laboratory. It is one of the preferred methods for highly coloured and turbid waters, and also for analysis of waters not suitable for the Winkler titration method because of iron- and iodine-fixing substances, which can interfere in the iodometric method specified The method is suitable for drinking waters, natural waters, waste waters, and saline waters. If used for saline waters such as sea or estuarine waters, a correction for salinity is essential for concentration measurement of oxygen.

ISO 17289:2014 Referenced Document

• ISO 3696:1987 Water for analytical laboratory use; Specification and test methods
• ISO 5813:1983 Water quality; Determination of dissolved oxygen; Iodometric method
• ISO 5814:2012 Water quality - Determination of dissolved oxygen - Electrochemical probe method
• ISO 7888:1985 Water quality; Determination of electrical conductivity

ISO 17289:2014 history

• 2014 ISO 17289:2014 Water quality - Determination of dissolved oxygen - Optical sensor method