Colorimetric method for quantitative determination of the content of substances in solutions of intensity. In the basis of colorimetry is the law of the Bouguer-Lambert-Fans, according to which the colour intensity is proportional to the concentration colored substances in solution, and the thickness of the layer.
Colorimetry, you can make a visual and photovoltaic ways by using a colorimeter. To the visual ways colorimetry belong: determination using standard series (color scale) and a way of balancing. When using standard series compare the colour intensity of the investigated solution with colors standard solutions, corresponding to various well-known concentrations of the test substance. In colorimeters used way of balancing, the intensity of light passing through the test and standard solutions, equalized by changing the thickness of one of the solutions.
The principle of photovoltaic colorimetry is to register a photocell intensity monochromatic light (marked with color filter), passed through the colored solution. Colorimetric widely used in the hygiene laboratory and clinical research, in particular in the analysis of blood (see Geometry).