Turbidity Measurement Scale
Turbidity is a measure of the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air.
Standard Unit for Turbidity
The measurement of turbidity is standardized to ensure consistent results across different instruments and laboratories.
- The standard unit for turbidity measurement is the Nephelometric Turbidity Unit (NTU).
- This unit is based on the light scattering properties of the particles in the water.
Identifying the Correct Scale
Different scales have been developed historically, but a standard reference is crucial for scientific and regulatory purposes. The widely accepted standard reference scale for measuring turbidity is the silica scale.
- Historically, turbidity was measured against a standard suspension of silica (formazin or diatomaceous earth).
- Modern instruments calibrated using standards based on formazin or specific polymers report results in NTU, which directly relates to the conceptual basis of the Standard silica scale.
Therefore, turbidity is measured on the Standard silica scale.
Important Questions from Quality of Water
A hard water would have hardness (in $\text{mg/L}$):
If the odour intensity or pO value is 2, then what is the interpretation?
As per IS 10500:2012, the permissible limit of total dissolved solids (TDS), (in mg/l), in drinking water in the absence of an alternate source is:
With the increase of turbidity, the muddy water appears brown due to the upward radiance peak shift towards:
Eutrophication of water bodies is caused by the-
