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How To Determine The Moisture Of Nickel Powder

wallpapers Industry 2021-01-22
Aluminum is a silver-white light metal. There is malleability. Commodities are often made into rods, sheets, foils, powders, ribbons and filaments. It can form an oxide film to prevent metal corrosion in humid air. Aluminum powder and aluminum foil can burn violently when heated in the air and emit a dazzling white flame.
Take about 1.0g of this product, accurately weigh it, put it in a 200mL measuring flask, add 10mL of dilute hydrochloric acid to dissolve it, add water to dilute to the mark, shake well, accurately measure 20mL, add ammonia to the test solution and neutralize it until precipitation is just precipitated, and then drip Add dilute hydrochloric acid until the precipitate just dissolves, add 20 mL of acetic acid-ammonium acetate buffer (pH 6.0), then precisely add 25 mL of ethylenediamine tetraacetate disodium titrant (0.05 mol/L), boil for 3 to 5 minutes, and put Cool to room temperature, add 1 mL of xylenol orange indicator solution, titrate with zinc titrant (0.05mol/L) until the solution turns from yellow to red, and correct the titration result with a blank test.
Note 1: "Precision weighing" means that the weighing should be accurate to one thousandth of the weighed weight, and "precision weighing" means that the accuracy of measuring the volume should meet the requirements of the national standard for the volumetric pipette. Precision requirements.
Note 2: The drying method is used for "moisture determination". Take 2~5g of the test sample and spread it in a flat weighing bottle that is dry to constant weight. The thickness should not exceed 5mm. The loose sample should not exceed 10mm. Weigh accurately. Open the bottle cap and dry for 5 hours at 100~105℃, close the bottle cap, transfer to a desiccator, cool for 30 minutes, accurately weigh, and then dry at the above temperature for 1 hour, cool, and weigh until two consecutive times The difference in weighing does not exceed 5mg. According to the lost weight, calculate the water content (%) in the test product.

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Tag: Powder   Aluminum