Paper Testing Methods Microscopical Chemical And Physical Processes Described
Paper Testing Methods Microscopical Chemical And Physical Processes Described
Technical Association of the Pulp And Paper Indust
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Make alka- line slowly with ammonium hydroxide. The formation of a white precipitate shows the presence of calcium. Filter off this precipi- tate and make the filtrate alkaline with ammonium hydroxide. Add 5 cc. Saturated solution of sodium acid phosphate and stir with a rod. There will be a crystalline precipitate formed if magnesium is present. It forms slowly and is best brought down by an occasional rubbing of the sides of the beaker with a stirring rod. These tests indicate the possible co...mbinations of elements in the filler. Where there are several names for one chemical com- bination such as talc, asbestine, agaiitc, etc. For various mag- nesium silicates a microscopic analysis and comparison of the. Crystal form with known samples is necessary. Quantities of al- uminum invariably indicate clay. Silica and magnesium indicate talcs, agalitcs or asbestine and water-soluble sulphates from filler point to calcium sulphate. *(12). If the paper contains calcium sulphate, the ash obtained may consist partly of calcium sulphide, due to reducing action of the carbon found on ignition, and the amount will, therefore, not represent the true amount added.
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