Benefits:

These have the following benefits.

• There are no volatilisation losses.
• Those have a shorter reaction time and improved decomposition because of high temperatures.
• The blank values are low.
• Those do not have contamination from external sources.

If the concentration of the elements to be determined is too high, then the solution must be diluted quantitatively before commencing the absorbance measurements. Conversely, if the concentration of the metal within the test solution is too low, a concentration process such as solvent extraction or ion-exchange must be followed. While analysing halogens and some other elements such as S, Se, P, B, Hg, as and Sb, it is advantageous to use combustion in an oxygen flask. The combustion is carried out in a sealed container and the reaction products are absorbed in a suitable solvent. Metals and alloys can usually be dissolved in acids, whereas dissolution of glass requires alkaline or acid fusion. Commonly speaking, the last solution of the analyte should not contain acid concentration more than about 1 M or else aspiration of corrosive solution may damage the burner.