Colorimetry is an analytical method to determine the concentration of color forming dissolved substances in solution. It uses the principle that absorption of light of characteristic wavelengths is proportional to the concentration of the dissolved substance (Beer-Lambert law). Infinita Lab, USA, network of testing labs offers this test to clients in the USA and across the world.... Read More

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    Concentration Measurement by Colorimetry

    Colorimetry is an analytical method to determine the concentration of certain dissolved substances in solution. It is based on the principle that when a beam of white light passes through a colored solution, some wavelengths are absorbed, changing the color and intensity of the transmitted beam. The transmitted light is detected by a photoelectric cell, producing a digital or analog signal that is recorded. The main parts of a colorimeter are a light source, a sample cell to hold the specimen solution and a photoelectric detector system. Colorimeters are used for a wide range of research and quality control applications across the chemical, environmental and biological fields.

    Concentration is determined from the Beer-Lambert law which relates absorbance and transmission intensities to the concentration of the dissolved substance and the distance traversed through the sample cell. 

    Some substances that are colorless in solution can be made to react with suitable reagents that produce colored products, in proportion to the concentration. The resulting solution is subjected to colorimetric testing. Comparison with a known calibration standard enables the determination of unknown concentrations of the substance.

    Monochromatic light from a controlled source can also be used, in which case the method is termed spectrophotometry.

    Common Uses of Colorimetry

    • Raw Water quality testing
    • Wastewater pollution testing
    • Food Processing quality control
    • Paint color quality control
    • Textile color quality control
    • Pharmaceutical products quality control

     Advantages of Colorimetry

    • Quick and simple technique
    • Provides a quantitative estimate
    • Portable equipment can be used in field conditions

     Limitations of colorimetry

    • Only colored solutions can be analyzed
    • Calibration with a standard solution is needed
    • Different substances with same color may cause errors

     Industrial Applications of Colorimetry

    • Environmental testing
    • Food industry
    • Textile Industry
    • Pharmaceutical Industry

    More Details:

    Colorimetry | chemistry | Britannica

    Colorimeter Principles and Applications (

    Use of a Colorimeter (

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