Turbidity is one of the indexes that show the level of “murkiness” in water and sewage treatment plants, rivers, industrial wastewater, etc. The more the water is turbid, the higher the turbidity, and the more clear the water is, the lower the turbidity.
Turbidity is divided into visual turbidity, transmitted light turbidity, scattered light turbidity and integral sphere turbidity. When measured in comparison with kaolin standard solution, it is expressed as "degree (kaolin)", and when measured in comparison with formazin standard solution, it is expressed as "degree (formazine)". Therefore, the measurement results of the obtained turbidity differ depending on the type of the standard solution and the measurement method.
"SS" is an abbreviation of “suspended solids,” and is one of the indexes used in factory wastewater, etc. The total volume of suspended solids, which have not been dissolved and cause murkiness in the water, is called the SS volume. The measurement method is to filter a certain amount of water with filter paper, dry the remaining substance and measure the weight.