Ash content is determined by calcination and deionized water is not necessary.
To evaluate the insoluble content of a substance.
The amount of ash produced during combustion relative to the amount of fuel fed into the wood pellet stove. Ash content is one indicator of quality for wood pellet fuel. Ash content for wood pellets should be between one and three percent. 

Fixed Carbon by Difference = 100 - (Volatile Content + Ash Content + Moisture Content)
0.01 g
When the filter paper is burned some 'ash' will be left behind.
what is calorific value of high speed diesel ? what is calorific value of high speed diesel ?
acid insoluble ash indicates the amount of silica present in the given sample
Ash Content is usually expressed in % Ash Content & is calculated as follows: % Ash Content = (Sample wt. after drying @ 500-550 Deg C - for 3 Hrs) x 100 (Initial Sample wt. dried @ 105 Deg.C - for 3 Hrs.)
Marine diesel fuels typicaly contain ~12% Hydrogen.
The higher calorific value of diesel oil is 44,800 kj/kg and 19,300 btu/lb. The lower calorific value of diesel oil is 43,400 kj/kg.
particulates.