Is there any difference between turbidity and suspended solids content?
Suspended matter refers to solid matter suspended in water, including water-insoluble inorganic matter, organic matter, and mud, clay, and microorganisms. Turbidity refers to the degree of obstruction of suspended matter in water when light passes through. Generally speaking, the more suspended matter in the water, the greater the obstruction to light and the greater the turbidity of the water. However, the turbidity of water is not only related to the content of suspended matter in water, but also related to the size, shape and refractive index of suspended matter in water. Turbidity is to measure the astigmatism of the solution to light, and the suspended matter can also be expressed by turbidity, otherwise, the workload of measuring the content of suspended matter by gravimetric method is too large, and it is not necessary to be so accurate in some places, so Turbidity is introduced as a rough representation. There is a certain relationship between suspended matter and turbidity, that is to say, for the same type of water and suspended matter, turbidity and suspended matter content have a ratio relationship. Turbidity refers to the degree of obstruction of the solution to the passage of light, which includes the scattering of light by suspended matter and the absorption of light by solute molecules. The turbidity of water is not only related to the content of suspended substances in the water, but also related to their size, shape and refractive index. Turbidity is usually suitable for water quality determination of natural water, drinking water and some industrial water. The water sample for turbidity measurement should be tested as soon as possible, or refrigerated at 4°C, and tested within 24 hours. Before the measurement, the water sample should be shaken vigorously and returned to room temperature. Suspended solids and colloids such as soil, silt, fine organic matter, inorganic matter, and plankton in the water can make the water turbid and present a certain turbidity. According to the water quality analysis, the turbidity formed by 1 mg SiO2 in 1L water is one Standard turbidity unit, referred to as 1 degree. Generally, the higher the turbidity, the cloudier the solution.