A colorimetric test is a test which forms a color. The amount of the color is then measured. In most tests the more color formed, the more of the test substance there is in the water.

What type of test is done in a colorimeter?

Color change tests can be done through the use of a colorimeter. It operates much like the other methods in that it adds appropriate reagent that produces a color change. The sample is then placed into a meter where the color is read by measuring the absorbance of a solution at a specified wavelength of light.

What is colorimetric analysis used for?

Colorimetric analysis is the technique normally used to determine the concentration of analyte through comparing the color changes of the solution.