PRINCIPLE
o The main principle of dry chemistry is based upon the reflectance spectrophotometry.
o Reflectance spectrophotometry measures the reflectance of materials.
o They provide a reference standard for the comparison of the color of different samples.
Spectrophotometer
is a device that measure the light intensities as a function of wave length.
It does it by diffracting the light beam into a spectrum of wavelength, detecting the light intensities with charged couple device.
COMPONENTS OF SPECTROPHOTOMETER
o Light source
o Device to isolate light of a desired wavelength
o Cuvet
o Photodetector
o Readout device
o Data system.