Color interference occurs when turbidity exceeds 1 and the pH is within which range?

Color interference occurs when turbidity exceeds 1 and the pH is within which range?

• A. Turbidity > 1 and pH between 4 and 10
• B. Turbidity > 1 and pH outside 4 to 10
• C. Turbidity ≤ 1 and pH 4-10
• D. Turbidity > 5 and pH 2-6

Answer: (A)

Color interference in colorimetric measurements happens when the sample both disturbs light transmission and alters the color chemistry of the test. When turbidity is greater than 1, suspended particles scatter light, which distorts the color signal the instrument or observer relies on. If the pH is within about 4 to 10, the color development of many reagents stays in a form that is particularly sensitive to this distorted light, making the interference more noticeable. Outside that pH range, either the color reaction behaves differently or the turbidity effect is less disruptive, so the same interference is not as likely. So the condition that leads to color interference is high turbidity paired with a pH in the 4–10 range.

Color interference in colorimetric measurements happens when the sample both disturbs light transmission and alters the color chemistry of the test. When turbidity is greater than 1, suspended particles scatter light, which distorts the color signal the instrument or observer relies on. If the pH is within about 4 to 10, the color development of many reagents stays in a form that is particularly sensitive to this distorted light, making the interference more noticeable. Outside that pH range, either the color reaction behaves differently or the turbidity effect is less disruptive, so the same interference is not as likely. So the condition that leads to color interference is high turbidity paired with a pH in the 4–10 range.