The compounds that the sulfur element makes with another element are called sulfur. Or, in other words, sulfur is a new substance that sulfur forms by combining it with another element. There are also three types of sulfur, depending on the type of element that is fused: nonmetallic sulfides, metal sulfides and organic sulfides.

Nonmetallic sulfides are sulfur compounds formed with nonmetals such as boron, carbon, phosphorus and arsenic. Examples include carbon sulfide, carbon dioxide and carbon monoxide. Metal sulfides are salts of sulfur acid. Examples are potassium sulphide and sodium sulphide.

The metal sulfides may be substantially dull, colored or of metal luster. These are immediately soluble crystalline solids. Among the sulfides in this group, only alkali and alkaline earth sulphides are dissolved in water. Hydrogen sulfide is released when some of the metal sulfides are degraded by acids. Some metal sulfides, when oxidized in the heat, yield sulfates at moderate temperatures and sulfur oxides and metal oxides at high temperatures. Metal sulfides are abundant in nature and form important minerals.

Organic sulfides are mainly alcohol or phenol esters. Some of them are used in medicine. Sulfur deficiency is the most common cause of obesity, various heart diseases, Alzheimer's disease and excessive fatigue.

Although the flow rates of industrial wastewaters are low, both the pollutants found in them are high and their concentrations are high compared to domestic wastewaters in terms of the pollutants they contain. These wastewaters cause a wide range of problems if they are released to the nature without any treatment or sufficient treatment. In this respect, high sulfur values ​​to be found in wastewaters harm the nature.

Authorized laboratories also perform sulfur measurements within the scope of water and wastewater measurements. In these studies, laboratories should operate in accordance with TS EN ISO / IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories.