What is commonly used to test for chlorine residual in water?

What is commonly used to test for chlorine residual in water?

• A. DPD
• B. SDS
• C. SCBA
• D. CCR

Answer: (A)

DPD, or N,N-diethyl-p-phenylenediamine, is a commonly used reagent for testing chlorine residual in water samples. When DPD is added to a water sample containing chlorine, it reacts to form a colored compound. The intensity of the color produced is proportional to the concentration of chlorine present, allowing for quantitative measurement. This method is popular due to its sensitivity and specificity, making it an effective choice for monitoring chlorine levels in water distribution systems. The other choices represent different concepts or tools that are not specifically used for chlorine testing. SDS refers to Safety Data Sheets, which provide information about chemical safety and handling. SCBA stands for Self-Contained Breathing Apparatus, typically used for respiratory protection in hazardous environments. CCR refers to the Consumer Confidence Report, which provides information about water quality to consumers but does not pertain to testing methods. These distinctions help clarify why DPD is the correct and relevant choice for testing chlorine residual in water.

DPD, or N,N-diethyl-p-phenylenediamine, is a commonly used reagent for testing chlorine residual in water samples. When DPD is added to a water sample containing chlorine, it reacts to form a colored compound. The intensity of the color produced is proportional to the concentration of chlorine present, allowing for quantitative measurement. This method is popular due to its sensitivity and specificity, making it an effective choice for monitoring chlorine levels in water distribution systems.

The other choices represent different concepts or tools that are not specifically used for chlorine testing. SDS refers to Safety Data Sheets, which provide information about chemical safety and handling. SCBA stands for Self-Contained Breathing Apparatus, typically used for respiratory protection in hazardous environments. CCR refers to the Consumer Confidence Report, which provides information about water quality to consumers but does not pertain to testing methods. These distinctions help clarify why DPD is the correct and relevant choice for testing chlorine residual in water.