标准编号：ISO 17289:2014
中文名称：水质 溶解氧的测定 光传感器法
英文名称：Water quality — Determination of dissolved oxygen — Optical sensor method
发布日期：2014-07
标准范围
This International Standard specifies an optical method for the determination of dissolved oxygen inwater using a sensor working on the basis of fluorescence quenching.Measurement can be made either as a concentration of oxygen in milligrams per litre, percentagesaturation (% dissolved oxygen), or both. Depending on the instrument used, detection limits of0,1 mg/l or 0,2 mg/l can be reached according to the manufacturer’s manual. Most instruments permitmeasurement 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 caseof 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 toprevent the outgassing of oxygen during the handling and measurement of the sample. Similarly, it isimportant 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 dissolvedoxygen as well as measurements made in the laboratory. It is one of the preferred methods for highlycoloured and turbid waters, and also for analysis of waters not suitable for the Winkler titration methodbecause of iron- and iodine-fixing substances, which can interfere in the iodometric method specifiedin ISO 5813.The method is suitable for drinking waters, natural waters, waste waters, and saline waters. If usedfor saline waters such as sea or estuarine waters, a correction for salinity is essential for concentrationmeasurement of oxygen.
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