A 100 mg pepper was taken in a beaker and dissolved in
concentrated nitric acid (5 mL) with heating. The solution was
cooled, neutralised with NaOH solution, diluted and filtered. The
filtrate was made to 100 mL with water in a calibrated flask and
the recommended procedure was followed.
Also, 20 g of tomato, grape, okra, spinach, mint and coriander
was heated in silica crucible for 3 h on a hot plate and the charred
material was transferred to a furnace and heated at 650 C
overnight. The residue was cooled and treated with 10.0 mL con-