Water quality indicators for ultra-pure water machine applications

The application of ultra-pure water machine is inseparable from the "water quality". Whether it is the influent water source or the produced water of the ultra-pure water machine, it is necessary to strictly judge its water quality. In the use of our ultra-pure water machine, we will see a lot of data indicators, most of which point to "water quality", therefore, water quality is the soul of ultra-pure water machine. What are the indicators of water quality? Let’s take a look today:

1, TDS value
Refers to the total content of dissolved solids in water (Total Dissolved Solids abbreviation), usually used to measure the water quality of the source water. The measuring tool is the TDS pen. The measuring principle actually reflects the TDS value by measuring the conductivity of the water. The more soluble solids dissolved in water, the larger the TDS value and the higher the conductivity of water. Usually, the TDS is about 1/2 of the conductivity test value. The TDS value of tap water in the Yangtze River Basin in China is usually 100-200 pm. The TDS value of tap water in the Yellow River Basin is usually 300-600ppm.
Remarks: The TDS value is different from the salt content of water (also known as salinity). The TDS value is usually greater than the salt content of water, because TDS includes not only the dissolved salt content of water, but also the dissolved organic matter. substance. Only when the water is very clean and the organic content is very low, the TDS value can be used to approximate the salt content (or salinity) of the water. In general, the TDS value, salinity and salinity are in the water content. In a positive relationship.

2, turbidity
The turbidity occurs when the water contains particles in a suspended or colloidal state. The turbidity procedure is called turbidity (unit is "degree"), and the turbidity of 1 mg of SiO2 (silica) in 1 liter of water is 1 degree. The turbidity requirement of the national standard drinking water is less than 5 degrees.

3, hardness
The hardness of water refers to the content of dissolved calcium and magnesium in water to metal salts (including about 85% of calcium salts, 10-15% of magnesium salts, and 1 to 3% of other metal salts), mainly referring to Ca2+ and Mg2+ in water. The content of ions, Ca2+/Mg2+ in water is mainly derived from the dissolution of calcium and magnesium salts (CaCO3/Mgco3) in rocks. When the content of CO2 gas in water is high, the dissolution progress will be greatly accelerated. The hardness is divided into temporary hardness (carbonate hardness can be removed by heating precipitation) and hardness non-carbonate hardness, which cannot be removed by heating and boiling. The sum of the two is called total hardness. The hardness of the international water is German hardness. The water content of 10mg of CaO (calcium oxide) in 1 liter of water is 1 German hardness, and the water with hardness greater than 8 degrees (equivalent to 200pm) is hard water. The total hardness of China's drinking water national standard is specified. The indicator should not be greater than 450ppm.

4, PH value
The PH value represents the negative logarithm of the H+ concentration in the water, also known as the hydrogen ion index, and the pH value can indicate the magnitude of the magnitude of the change in the acidity and alkalinity of the solution.

Strong acidic aqueous solution: PH<5.0
Weakly acidic aqueous solution: PH=5.0～6.4
Neutral aqueous solution: PH=6.5～8.0
Weakly alkaline aqueous solution: PH=8.1~10
Strong alkaline solution: PH>10

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