The determination of sulfated ash of starch and its derivatives usually adopts the following steps:
Prepare the sample: Weigh 1-2 grams of the starch or starch derivative sample, add it to 50 ml of distilled water, and stir it evenly with a stirrer.
Sulfation: Transfer the sample to a 250ml Erlenmeyer flask, add 20ml of concentrated sulfuric acid, and stir it evenly with a stirrer. Then place the Erlenmeyer flask in a Water Bath and heat it at room temperature for 1 hour to discharge the generated SO2.
Ash content on ignition: put the Erlenmeyer flask into an oven, dry it at 105°C until it reaches a constant weight, then take it out and place it at room temperature to cool. Put the sample into the combustion furnace and burn it to above 600°C until the ash is completely burned.
Weight measurement: take the sample out of the combustion furnace, after cooling to room temperature, place it in a weighing bottle, measure its weight with a precision balance, record and calculate the ash content.
The formula for calculating the ash content is as follows:
Ash content (%) = (weight of sample after burning - weight of unburned sample) / weight of original sample × 100%
NBCHAO reminds you: pay attention to safety during operation, and avoid harm to human body caused by sulfuric acid and high temperature. At the same time, it is necessary to control the experimental conditions and repeat the measurement many times in order to obtain accurate measurement results.
