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What is colorimetry?
Based on the color reaction generating colored compounds, determine the content of the testing components by comparing the color or material solution color depth.
The basic requirement of colorimetric analysis to color reaction:Responses should have high sensitivity and selectivity and the colored compounds composed should be constant and stable, which must be greatly different with the reagent in color.
principle: The mathematical expression of Lambert - Beer"s law
A=lg(1/T)=Kbc
A is absorbance, T is the transmission ratio i.e. projected light intensity than the incident light intensity
C for the concentration of absorption substance, b for the thickness of absorption layer
Physical meaning:when a bouquet of parallel vertical monochromatic light projecting through non-uniform scattering absorption material the absorbance A is proportional to the concentration of absorption material c  and the thickness of absorption layer b.
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