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China's national standard "GB 28234-2020 Hygienic Requirements for Acidic Electrolyzed Water Generators" will be formally implemented on August 1, 2021, in which important provisions have been made for the physical and chemical indicators of acidic oxidation potential water and slightly acidic electrolyzed water.
Main content of physical and chemical indexes of acidic electrolyzed water :
4.2 Potentially acidic oxidizing water
4.2.1 Characters and physical and chemical indicators
4.2.1.1 Colorless transparent liquid with slight chlorine odor
4.2.1.2 The main active ingredient is hypochlorous acid (HCIO), and the effective chlorine content is 50mg/L~70mg/L.
4.2.1.3 The pH value is 2.0~3.0.
4.2.1.4 Oxidation-reduction potential (ORP)>1100mV
4.2.1.5 Residual chloride ion <1000mg/L
4.2.1.6 The production volume is ≥1000mL/min.
4.3 Slightly acidic electrolyzed water
4.3.1 Characters and physical and chemical indicators
4.3.1.1 Fish-free transparent liquid with slight chlorine smell
4.3.1.2 The main active ingredient is hypochlorous acid (HCIO), and the effective chlorine content is 40mg/L~80mg/L.
4.3.1.3 The pH value is 5.0~6.5.
4.3.1.4 Oxidation reduction potential (ORP) ≥600mV
4.3.1.5 Residual chloride ion <1000mg/L
4.3.1.6 The production volume is ≥1000mL/min.
In addition to the three indicators of effective chlorine concentration, pH value, and oxidation-reduction potential (ORP) that we often pay attention to, residual chloride ion is also an extremely important indicator. On the one hand, it reflects the electrolysis efficiency of the equipment (the higher the electrolysis efficiency, the more residual chlorine The lower the ion concentration), on the other hand, residual chloride ions are also one of the most important factors that cause metal corrosion. In addition, the higher residual chloride ion will also affect the storage stability of the generated hypochlorous acid water.
