Which unit is used to express turbidity in the context described?

Which unit is used to express turbidity in the context described?

• A. Nephelometric Units
• B. NTU
• C. Turbidity Units
• D. Absorbance Units

Answer: (B)

Turbidity is quantified by how much light is scattered by suspended particles, typically using a nephelometer. The standard way to express that measurement is in Nephelometric Turbidity Units (NTU). This unit arises from the nephelometric method, which measures light scattered at a 90-degree angle to the incoming beam and is calibrated against a formazin standard to yield NTU values. Other terms aren’t the formal unit used: Nephelometric Units describes the method rather than the unit name, Turbidity Units is a generic label, and Absorbance Units pertain to how much light is absorbed in spectrophotometry, not how much is scattered.

Turbidity is quantified by how much light is scattered by suspended particles, typically using a nephelometer. The standard way to express that measurement is in Nephelometric Turbidity Units (NTU). This unit arises from the nephelometric method, which measures light scattered at a 90-degree angle to the incoming beam and is calibrated against a formazin standard to yield NTU values.

Other terms aren’t the formal unit used: Nephelometric Units describes the method rather than the unit name, Turbidity Units is a generic label, and Absorbance Units pertain to how much light is absorbed in spectrophotometry, not how much is scattered.