M00016673
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ISO FDIS 17289 2014 Edition, March 17, 2014 WATER QUALITY - DETERMINATION OF DISSOLVED OXYGEN - OPTICAL SENSOR METHOD
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Availability date: 07/14/2021
Description / Abstract:
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 in ISO 5813.
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.