Dissolution Test of CaSO4 ·2 H2 O in Gypsum Fibrosum / 医药导报

ABSTRACT

Objective To establish a method for the determination of the dissolution rate of CaSO4 ·2H2 O in Gypsum Fibrosum. Methods The dissolution rate was determined by EDTA-2Na titration method,with a paddle,800 mL of purified water as dissolution medium,at rotation speed of 75 r·min-1,and temperature of(37. 0±0. 5 ) ℃,at 5,10,20,30,60,90, 120 min for the sampling. Results There was a linear regression relationship between dissolution time and dissolution of CaSO4 ·2H2 O,when the particle size of Gypsum Fibrosum were 2. 000, 0. 150 mm. There was a logarithmic regression relationship between dissolution time and dissolution of CaSO4 ·2H2 O,when the particle size of Gypsum Fibrosum was 0. 075 mm. Conclusion The method is simple and accurate,which can be used for determination of the dissolution rate of CaSO4 · 2H2 O in Gypsum Fibrosum.