Which of the following are units used to measure turbidity? A. Jackson…
2024
Which of the following are units used to measure turbidity?
A. Jackson Turbidity Unit
B. Darcy Turbidity Unit
C. Nephelometric Turbidity Unit
D. Fermi Turbidity Unit
E. Formazin Turbidity Unit
Choose the correct answer from the options given below:
Answer: B. A, C and E only — ConceptTurbidity describes the loss of water clarity caused by suspended particles. A turbidity unit is tied to a defined optical measurement or calibration…
- A.
A, B and C only
- B.
A, C and E only
- C.
B, D and E only
- D.
A, D and E only
Show answer & explanation
Correct answer: B
Concept
Turbidity describes the loss of water clarity caused by suspended particles. A turbidity unit is tied to a defined optical measurement or calibration standard.
The Jackson candle method gives JTU, nephelometric light-scattering measurement gives NTU, and a formazin calibration may be expressed as FTU.
Application
Jackson Turbidity Unit is a turbidity unit derived from the Jackson candle method.
The darcy is a unit of permeability, so “Darcy Turbidity Unit” mixes turbidity with a unit for a different physical property.
Nephelometric Turbidity Unit is based on measuring light scattered by suspended particles.
The fermi is a unit of length, so “Fermi Turbidity Unit” mixes turbidity with a unit for a different physical quantity.
Formazin Turbidity Unit uses a formazin suspension as the calibration reference.
Cross-check
Darcy and fermi already have established meanings—permeability and length—whereas Jackson, nephelometric and formazin are associated with turbidity measurement.
Therefore, the valid units listed are A, C and E only.