The DPD method is used to test for which contaminant?

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Multiple Choice

The DPD method is used to test for which contaminant?

Explanation:
The DPD method is a colorimetric test used to determine chlorine residual in water. N,N-diethyl-p-phenylenediamine reacts with chlorine compounds (free chlorine like hypochlorous acid and hypochlorite, and total chlorine when measured with the proper step) to form a pink to red color. The color intensity increases with the amount of chlorine present, and a colorimeter or comparator translates that color into a chlorine concentration. This makes it a direct and widely used way to monitor disinfection performance in drinking water and pools. Nitrate, fluoride, and water hardness are measured with different methods because they react with different reagents and produce distinct color changes or signals; they are not assessed by the DPD color reaction.

The DPD method is a colorimetric test used to determine chlorine residual in water. N,N-diethyl-p-phenylenediamine reacts with chlorine compounds (free chlorine like hypochlorous acid and hypochlorite, and total chlorine when measured with the proper step) to form a pink to red color. The color intensity increases with the amount of chlorine present, and a colorimeter or comparator translates that color into a chlorine concentration. This makes it a direct and widely used way to monitor disinfection performance in drinking water and pools.

Nitrate, fluoride, and water hardness are measured with different methods because they react with different reagents and produce distinct color changes or signals; they are not assessed by the DPD color reaction.

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