Figure 9 to suck light in accordance with the rules of the Lambert (lambert law)5.2.2 rules of beer (Beer law) rules of beer (r. 1852) says that the light that is in direct proportion to suck with the concentration of the substance in the liquid which, when calculated, as well as the rules of the Lambert to the equation. It = I0 x 10-kc -----------------------(2) When combining the two rules together (Beer-Lambert's law) by adding equations (1) and equation (2) is entitled to a new equation as follows:It = I0 x 10-εct -----------------------(3) But the light shines through (transmittance, T) is equal to It, and I/0 light are absorb (absorbance, A, or optical density, OD) is equal to log (I0/It) so. A = εct -----------------------(4)Or A =-log T-----------------------(5)Ε = molar absorptivity for each type of substance is a constant ε in each wave.Mole-1cm-1 units C = substance concentration in units of mole/L. T = the thickness of the aqueous solution in the unit cm. 5.3 mechanical specification, call four-meter. (spectrophotometer components) The main components of a UV-video call centre-meter specification boen! There are 5 sections together.As follows: 1. light source (light source)2. section select the wavelength (wavelength selector)3. rack the substance (cell or cuvette)4. signal detector (detector)5. the best slip and variable signal output (recorder and processor)With all of the components are arranged as shown. Figure 10 diagram UV machines-video call centre meter specification boen! simple!5.3.1 light source (light source)Light source in a specification called four-meter would require radiation in the wavelength range of continuous and constant at all times. As well as having enough light intensity for ultraviolet wavelength range will use deuterium lamp.(Deuterium lamp) as a light source, light in the range of 185-375 nm. The principle is to make deuterium atom in the State rather than to spit out energy. Best tubes, tungsten (tungsten filament lamp) provides comprehensive range of wavelength of visible light is between 320-2500 nm, the principle is similar to an ordinary tungsten light bulbs is to provide electricity to pass through until the summer and tungsten wire.Emitting radiation coming out will normally leave turned on before running for about 30 minutes to make sure that the tungsten bulbs or deuterium lamp, light intensity, uniform. Figure 11 lamp deuterium tungsten bulb (left) and (right)Section 5.3.2 selecting wavelength (wavelength selector)Is used to separate wavelength that came out from the light source, which is light.Multiple-wavelength (wavelength polychromatic) light strips provide a narrow range or a single wavelength (monochromatic wavelength) instruments from before using a Prism or filters for separating the wavelength, but current Mono switch and a gate-rame (monochromater) is rotting (grating) reflective, which resembles a small Groove a lot. '' The light from the light source to fall impact onto the surface of the Groove laeosathon out corners only wavelength that we select only the channels light off (exit slit) into the sample substance.
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