Pure drinking water, engine cooling water, boiler feed water and other pure water or ultrapure water samples have clear requirements for water quality pH.
In some water bodies, the dissolved oxygen content in the water will increase significantly due to some reasons, leading to rich oxidation in the water body, and the dissolved oxygen content can reach more than 20mg/L.
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The national standard HJ 802-2016 "Electrode Method for the Determination of Soil Electrical Conductivity" gives a method for the determination of soil electrical conductivity.
Generally, the conductivity value can be used to roughly understand the salt in the solution.