Question

- Specifics of how spectrophotometry can be applied to identify components

Answer 1

spectrophotometry

Spectrophotometry is a method used to identifying a chemical compounds by measure the absorption of a particular intensity of light passed through the sample solution. The basic principles idea of spectrophotometry is different compounds only have absorb and transmitted only a specific range of wavelength light only. So we can identify the unknown compounds by measuring of that amount of transmitted and absorbing light intensity by special instrument and find out the compounds. Now days spectrophotometry is one of most useful methods of quantitative analysis of compounds in the form of solutions, transparent or opaque solids, polished glass, or gases etc., Although different fields in chemistry, biology, biochemistry,(enzymes-catalyst reactions) physics, engineering material and chemical engineering and varies clinical fields(blood cells diagnosis).

Several variations in the spectrophotometric methods in present days, like to based on measure the intensity of absorbed light (a) atomic absorption spectrophotometry and (b) atomic emission spectrophotometry based on measure the emitted light intensity.

In spectrophotometric methods photometers is a instrument is measure the amount of absorbed photons ( intensity of light) during the time of light passed through the sample solution. Spectrophotometer classifieds based on the range of light intensity used to it. These are

(1) UV-visible spectrophotometer: uses light intensity in the under of UV-Visible(100 - 700 nm) light ranges of the electromagnetic radiation spectrum.
In practice visible spectrophotometer we are use a prism to filter out certain range of wavelength, it helps to only passe the particular beam of ligt through the sample solution

(2) IR spectrophotometer: using the light intensity under the infrared range (700 - 15000 nm) of electromagnetic radiation spectrum.

Devices in spectrophotometer

Basic structure of spectrophotometers is consists of light source,
collimato(lense),
monochromator,
wavelength selector,
sample solution,
photoelectric detector,
Finally a digital display or a meter. As in a row (image uploaded in below)

In generally spectrophotometer consist of mainly two part of device a) spectrometer and b) photometer
Spectrometer is the device typically produce and diapers the light.
Photometer used to determine the intensity of photons or the light.

Device working

Spectrometer: It produces particular range wavelength of light, it passes through the collimator (lens) it will transmit a straight beam of light (photons) followed monochromator (prism).it helps to split the monochromatic light it into several component wavelengths (spectrum). Then wavelength selector (slit) helps to transmits the desired wavelengths of light to the sample solution,

Photometer: After the light transmitted to the sample solution the photometer detect the intensity of photons, the sample solution is that absorbed and then send to a digital display,

Collimator (Lens) Wavelength Selector (Slit) Detector (Photocell) 0.20 Digital Display or Meter Light source Monochromator (Prism or Grating) Sample Solution (in Cuvette)