ISI 02-1e Determination of Ash in Starch at 900 oC
Return 1. Scope The method is applicable to native and modified (non-oxidised) starch low in ash (<2%). LT 12 Dec. 1966 Rev. LT 21. Nov. 1997 2. Principle Incineration of starch sample at 900 o C 3.Apparatus 3.1 Analytical balance weighing to the nearest 0.1 mg. 3.2 Ashing dish of platinum or quarts 3.3 Electrically heated furnace. 3.4 Desiccator with dry drying agent 3.5 Bunsen burner 4. Procedure Careful clean the ashing dish (3.2) and heat it 1/2 hour in furnace (3.3) at 900 o C. Cool dish in desiccator (3.4) to room temperature and weigh on balance (3.1) to the nearest 0.1 mg. Weight = w 0 Clean always new dish in boiling dilute hydrochloric acid Cool platinum 15 min, quarts 30 min Distribute 5 g of sample in a uniform layer in dish. Close lid and weigh on balance (3.1) to the nearest 1 mg. Weight = w 1 Take 10 g of maize and tapioca starch Work quickly Incinerate the sample on a Bunsen burner (3.5) or equi