Acidity: the amount of acid in water that reacts with a strong base.
Alkalinity: the content of alkaline substances that can react with strong acids in water.
Hardness: the hardness of water is divided into carbonate hardness and non-carbonate hardness, and the sum of the two is the total hardness of water.
Carbonate hardness: refers to the salt of calcium, magnesium and bicarbonate in water.
Since the water is heated, the bicarbonate is decomposed into carbonate, and the solubility is reduced and the precipitation is precipitated, so it is called temporary hardness.
Non-carbonate hardness: the hardness of calcium and magnesium sulfate, nitrate and chloride.
It is also known as permanent hardness because water is heated to boiling under normal pressure.
Turbidity: ISO international standard defines turbidity as the reduction of liquid transparency due to the presence of opaque substances.
SDI value: also called silt density index, compared with turbidity, it represents water quality from different angles, but SDI value is more reliable than turbidity.
Turbidity is determined by spectrophotometry or turbidimetric method to determine the content of impurities in water, but it is not able to detect some colloidal particles in the water that are not sensitive.
Conductivity: the ability to represent the conduction current of a solution by a number.
Conductivity is often used to estimate the total concentration of ions in water.
The conductivity of an aqueous solution depends on the nature and concentration of the ions, the temperature and the viscosity of the solution.
Every increase 1 ℃, temperature conductivity increases by about 2% ~ 2.5%.
It is often based on 25.
The standard unit of conductivity is S/m(Siemens /m), which is commonly used in the case of S/cm.