After cooling to room temperature, 5 ml of 3 M HCl was added
to each crucible and placed on a sand bath at 120 ◦C for 3–4 h for
dryness. Subsequently, crucibles were removed from the sand bath
and 10 ml of 1 M HNO3 was added to dissolve the ash. After stirring,
the solution was transferred to a 50 ml volumetric flask and make
volume up to the mark with double-deionized water. The samples
were then filtered into 50 ml tubes and kept at 4 ◦C until analysis.
The samples were analyzed for Na and K contents using Atomic
Absorption Spectrometer (Perkin-Elmer 3300, Norwalk, CT, USA).
After cooling to room temperature, 5 ml of 3 M HCl was addedto each crucible and placed on a sand bath at 120 ◦C for 3–4 h fordryness. Subsequently, crucibles were removed from the sand bathand 10 ml of 1 M HNO3 was added to dissolve the ash. After stirring,the solution was transferred to a 50 ml volumetric flask and makevolume up to the mark with double-deionized water. The sampleswere then filtered into 50 ml tubes and kept at 4 ◦C until analysis.The samples were analyzed for Na and K contents using AtomicAbsorption Spectrometer (Perkin-Elmer 3300, Norwalk, CT, USA).
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