ISO 5814:2012规定了一种电化学方法，通过使用气体渗透膜与样品分离的电化学电池测定水中溶解氧。 测量可以是氧浓度（单位为毫克/升）、饱和度百分比（溶解氧%）或两者兼而有之。该方法测量1%至100%饱和度的水中的氧。然而，大多数仪器允许测量高于100%的值，即过饱和度。 当采取特殊措施防止样品处理和测量过程中氧气脱气时，该方法测量饱和度高于100%的水中的氧气。 该方法适用于现场测量、溶解氧连续监测以及实验室测量。它是高颜色和浑浊水的首选方法，也适用于分析不适合Winkler滴定法的水，因为铁和碘固定物质会干扰ISO 5813中规定的碘量法。 该方法适用于饮用水、天然水、废水和盐水。如果用于咸水，如海水或河口水域，则必须对盐度进行校正。

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.