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DIN EN ISO 5814:2013 Edition

DIN EN ISO 5814:2013 Edition

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Water quality – Determination of dissolved oxygen – Electrochemical probe method

Published By Publication Date Number of Pages
DIN 2013-02 21
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This International Standard specifies an electrochemical method for the determination of dissolved oxygen in water by means of an electrochemical cell which is isolated from the sample by a gas permeable membrane. Measurement can be made either as a concentration of oxygen in milligrams per litre, percentage saturation (% dissolved oxygen) or both. The method measures oxygen in water corresponding to 1 % to 100 % saturation. However, most instruments permit measurement of values higher than 100 %, i.e. supersaturation. 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. 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 the preferred method 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 may interfere in the iodometric method specified in ISO 5813.

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