Spectrophotometers determine the composition of a solution (or the concentration of certain substances within a solution) by measuring how the solution absorbs a particular wavelength of light. By varying the wavelengths in each measurement, one can take a spectrum of a solution and ascertain the composition. More advanced spectrophotometers can measure beyond the visible spectrum, providing readings for ultraviolet and infrared wavelengths.
Help us preserve and share the history of chemistry and related sciences. Make a tax-deductible donation online.
Munsell Book of Color
©2010 Chemical Heritage Foundation