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U8AA5540012
4. FEATURES OF STRONG ACID WATER
Electrolyzed water (electrolyzed functional water) is a solution with useful functions caused by
electrolyzation of thin salt water or tap water. Different conditions of electrolyzation produce
various kinds of electrolyzed water whose applications are categorized into: [1] sanitation
(strong acid water, strong alkaline water, weak acid water, hypochlorous acid water) and [2]
consumption (alkaline ionized water). The Water Electrolyzer ROX-20TA-U produces strong
acid water and strong alkaline water in the category [1].
Strong acid water has the following features:
(1) Main Ingredient: Hypochlorous acid*
1)
(2) pH: 2.2 - 2.7
(3) Oxidation-Reduction Potential*
2)
: Max. +1100mV
(4) Available Chlorine Concentration*
3)
: 20 - 60mg/L
(5) Color: None
(6) Others: Stimulative smell of chlorine
(contains un-electrolyzed salt)
*1) Hypochlorous acid (HOCl)
Dissolution of chlorine gas in water generates hypochlorous acid (HOCl) whose ratio to
hypochlorous acid ion (ClO
-
) varies with the pH of water. In the pH range for strong acid
water, much more HOCl than ClO
-
exists. Both HOCl and ClO
-
have a bactericidal
effect, but HOCl is much stronger than ClO
-
.
*2) Oxidation-Reduction Potential (ORP)
Oxidizing (or reducing) effect of the solution. The larger positive number indicates the
higher oxidizing effect.
*3) Available Chlorine Concentration
Chlorine concentration contributing to the bactericidal activity. It indicates the amount
of chlorine corresponding to iodine isolated in the following reaction:
NaOCl + 2Kl + 2CH3•COOH I2 + 2CH3•COOK + NaCl + H2O
Note: The terms related to chlorine are defined as below:
Residual Chlorine: Remaining chlorine as the result of excessive chlorine addition into
tap water to optimize the bactericidal effect of chlorination.
Free Chlorine: Chlorine (Cl2), hypochlorous acid (HOCl) and hypochlorous acid ion
(OCl
-
) generated by dissolution of chlorine in water.
Combined Chlorine: Chloramine (NH2Cl, NHCl2, NCl3) generated by dissolution of chlorine
in water containing ammoniate or organic nitride. Combined chlorine
is stable and durable, but not so effective in a quick bactericidal activity.
Available Chlorine: Combination of free chlorine and combined chlorine.