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Chapter 18: Q6 P (page 456)

18-6. Box 3-1 showed a single-beam spectrophotometric ozone monitor. The emission spectrum of the mercury vapor lamp is shown in Box 18-2.

  1. What is the light source?
  2. What is the detector?
  3. What is the monochromator?
  4. What are the components of the optical pathlength, b?
  5. How does this instrument measure O3?

Short Answer

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Step by step solution

01

Definition

Absorption:The process in which incident radiated energy is retained without reflection or Transmission on passing through the medium.

Radiation: The penetrating Raise and Particles admitted by a radioactive source.

Concentration: A measure of the amount of substances in another substances.

Absorbance: Wavelength light transmitted that is absorbed by the solution.

02

Light Source

  1. The light source is Mercury lamp.
03

Detector

b. The detector is photodiode.

04

Monochromator

c. The Monochromator is 254 nm filter.

05

Components of Optical Path length

d. The Components of optical path length are mirror lengths of two side legs and bottom leg.

06

Instrument to measure O3

e. This Instrument measures O3 by absorption of ultraviolet radiation from a mercury lamp. The more O3 in the air, the less radiation reaches the photodiode detector. From the measured absorbance at 254 nm, the instrument computes O3 concentration.

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