Spectrophotometer

A spectrophotometer measures nitrates in water by detecting how much light a treated sample absorbs. First, a reagent is added to the water sample, causing a chemical reaction that produces a colored compound in proportion to the nitrate concentration. The sample is then placed in a cuvette and inserted into the spectrophotometer. The instrument shines light of a specific wavelength through the sample and measures how much is absorbed. The more intense the color, the higher the nitrate level. Results are displayed in milligrams per liter (mg/L), providing an accurate and widely used method for nitrate analysis in laboratories.