Advantages of Emission Spectroscopy.
The emission method is extremely important in analysis.
- The technique is highly specific.
- The method is extremely sensitive. With this method, every metallic element can be detected even if they are present in very low focus (0.0001%)
- Even metalloids (Arsenicum, silicon and selenium) have been identified by this technique.
- The analysis can be performed either in a solid or liquid state with almost equal convenience.
- The technique requires minimum sample preparation, as a sample can be directly introduced into the arc or spark.
- The sample requires no preliminary treatment and can be analyzed as received.
- Spectra can be taken simultaneously for more than two elements. No separation is required. A little measure of the test (1-10 mg) is sufficient for analysis.
- The technique provides results very rapidly. If automated, the time required is just 30 seconds to one minute.
- This method has been used for a wide variety of samples like metals, alloys, paints, geological specimens, and forensic material, environmental and biological samples.
- The technique permits non-destructive analysis.
Disadvantages of Emission Spectroscopy.
- The equipment is costly and wide experience is required for its successful handling and interpretation of spectra.
- The recording is done on a photographic plate which sets aside some opportunity to create, print and interpret the result.
- Radiation intensities are not always reproducible.
- Relative error exceeds 1 to 2 %.
- The accuracy and precision are not high.