Total Sulphur Content:
The different samples of the briquettes was pulverized, 1g of the finely powdered samples was mixed with 5g of Na2NO3 and 0.2g of NaNO3 in a crucible. The mixture was preheated at 400oC for 30 minutes in an electric muffle furnance and then fused at 950oC, after fussion, the crucible was allowed to cool and was placed on its side in a 150 cm3 beaker. HCl was added to neutralize the Na2CO3 and boiled to precipitate the sulphate by treating with BaCl2. The precipitate treated with drops of HF and H2SO4, ignited and weighed again. Total sulphur is determined by the expression (Jackson, 1988).