B - CHAPTER V: ANALYTICAL METHODS & INSTRUMENTATION
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– radiant energy; photons of energy travelling in a wavelike manner
ELECTROMAGNETIC ENERGY
• The shorter the [?], the higher the [?]
wavelength; electromagnetic energy
Types of Electromagnetic energies:
• Cosmic rays • Gamma rays • X-rays • Visible • Ultra-violet (UV) • Infrared (IR) • Radio, TV, microwave, etc.
• distance between two peaks as the light travels in a wavelike manner
WAVELENGTH
wavelength is expressed in
nanometers (nm), angstroms (Å), and millimicron (mµ)
• 1 nm = [?] = [?]
10 Å 1 mµ
Kinds of Wavelength:
• Visible spectra • Non-visible spectra
= 340 nm – 700 nm
Visible spectra
(ultraviolet region)
= below 340 nm
(infrared region)
= above 700 nm
Kinds of Colorimetry:
• Visual Colorimetry • Photoelectric Colorimetry
– relies on visual acuity to determine end-point
Visual Colorimetry
180 - 220 Short UV
220 - 340 Short UV
340 - 430 Visible
Violet Yellow green
430 - 475 Visible
Blue Yellow
475 - 495 Visible
Green blue Orange
495 - 505 Visible
Blue green Red
505 - 555 Visible
Green Purple
555 - 575 Visible
Yellow green Violet
575 - 600 Visible
Yellow Blue
600 - 620 Visible
Orange Green blue
620 - 700 Visible
Red Blue green
– measurement of light intensity in a much narrower wavelength
SPECTROPHOTOMETRY