Turbidity is the degree of obstruction that occurs when suspended matter in water passes through light.
In other words, part of the light passing through the water is absorbed or scattered due to the presence of insoluble material in the water, rather than through straight lines.
Therefore, turbidity phenomenon is an optical property of sufficient water sample.
Turbidity and chroma are both optical properties of water, but they are different.
Chromaticity is caused by dissolved substances in water, while turbidity is caused by insoluble substances in water.
So, some water samples are high in color but not turbid, and vice versa.
Generally speaking, the more insoluble substances in water, the higher turbidity, but there is no direct quantitative relationship between the two.
Because turbidity is an optical effect, its size is related not only to the number and concentration of insoluble substances, but also to the particle size, shape and refraction index properties of these small dissolved substances.
In water quality analysis, the determination of turbidity is usually used only for natural water and water.
As for domestic sewage and industrial wastewater, most of them are quite cloudy due to the large amount of suspended pollutants. This kind of water sample is generally only used for the determination of suspended solids but not for the determination of turbidity.
Transparency refers to the degree of clarity of water sample, clean water is transparent.
The more suspended and colloidal particles in water, the lower the transparency.
Groundwater is usually more transparent.
Transparency is a water quality index related to the combined influence of water color and turbidity.