ISO 5814:2012规定了通过电化学电池测定水中溶解氧的电化学方法，该电化学电池通过透气膜从样品中分离出来。 测量可以作为氧浓度，以毫升/升，百分比饱和度（溶解氧％）或两者计。该方法测量对应于1％至100％饱和度的水中的氧气。然而，大多数仪器允许测量高于100％的值，即过饱和度。 该方法测量饱和度高于100％的水中的氧气，当进行处理和测量样品时防止氧气脱气的特殊布置。 该方法适用于现场测量和连续监测溶解氧，以及实验室中进行的测量。它是高度着色和混浊的水的优选方法，也用于分析由于铁和碘固定物质而不适合温克勒滴定法的水，这可能会干扰ISO 5813规定的碘量法。 该方法适用于饮用水，天然水，废水和盐水。如果用于盐水，例如海水或河口水域，则对盐度进行修正

ISO 5814:2012 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 measures oxygen in water with a saturation higher than 100 %, when special arrangements to prevent the outgassing of oxygen during the handling and measurement of the sample are made. 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 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.