Which factor is listed as interference with chlorine measurement?

Which factor is listed as interference with chlorine measurement?

• A. Turbidity/Color
• B. Hardness
• C. pH
• D. Temperature

Answer: (A)

Interference in chlorine measurement often comes from what the instrument actually reads—the color signal produced by the chlorine-reagent reaction. Turbidity and inherent color in the sample directly affect that optical signal. Turbidity scatters light, while existing color adds background coloration. Both distort the color reading used to quantify chlorine, leading to inaccurate results. That’s why turbidity and color are listed as interferences. While pH, temperature, and hardness can influence the chemistry of chlorine (such as the ratio of HOCl to OCl− or reaction rate) and thus the true chlorine level, they don’t distort the optical measurement in the same direct way as turbidity/color, which is why the listed interference focuses on turbidity and color.

Interference in chlorine measurement often comes from what the instrument actually reads—the color signal produced by the chlorine-reagent reaction. Turbidity and inherent color in the sample directly affect that optical signal. Turbidity scatters light, while existing color adds background coloration. Both distort the color reading used to quantify chlorine, leading to inaccurate results. That’s why turbidity and color are listed as interferences.

While pH, temperature, and hardness can influence the chemistry of chlorine (such as the ratio of HOCl to OCl− or reaction rate) and thus the true chlorine level, they don’t distort the optical measurement in the same direct way as turbidity/color, which is why the listed interference focuses on turbidity and color.