The UV-Vis Evolution 201 spectrophotometer (Thermo Scientific) enables measurement of light wave absorbance in the range of 190 – 1100 nm. The apparatus has dedicated software that enables not only quantitative measurement, but also kinetic tests and spectrum recording in the whole spectral range. Additionally, the apparatus is equipped with an embedded automatic rotor that enables testing several samples at pre-set conditions and temperature stabilisation. The spectrophotometer may be used to analyse all compounds that absorb radiation in the UV-Vis range, i.e. inorganic compounds (including nitrates, phosphates and sulphates) or organic ones (aromatic hydrocarbon, aldehydes, ketones, acids and amines, e.g. phenols, formaldehyde).