Reference

Importance of sample preparation in the sedimentation analysis of strontium carbonate

Importance of sample preparation in the sedimentation analysis of strontium carbonate. Pieczarowski, Henryk (Zakl. Dosw.-Badaw. Ceram. Elektron., Warsaw, Pol.). Szklo Ceram., 27(10), 269-71 (Polish) 1976. CODEN: SZKCAN. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 79 The best dispersion of SrCO3 agglomerates is achieved after 20 min ultrasonic treatment in aq. suspension with 12.85 g/L SrCO3 and 0.131 g/L Na4P2O7.10H2O [13472-36-1]. The sedimentation curve of the sample correlates with results of the microscopic anal. used for the grain-size distribution control.

Studies on salt hydrates for latent heat storage

Studies on salt hydrates for latent heat storage. V.Some chemicals with cas registry numbers like 6131-90-4 and 13472-36-1 are also used. Preheating effect on crystallization of sodium acetate trihydrate from aqueous solution with a small amount of sodium pyrophosphate decahydrate. Wada, Takahiro; Matsunaga, Koji; Matsuo, Yoshihiro (Cent. Res. Lab., Matsushita Electr. Ind. Co., Ltd., Osaka 571, Japan). Bull. Chem. Soc. Jpn., 57(2), 557-60 (English) 1984. CODEN: BCSJA8. ISSN: 0009-2673. DOCUMENT TYPE: Journal CA Section: 75 (Crystallography and Liquid Crystals) Influences of preheating temp. and time were studied on the crystn. of CH3CO2Na.3H2O from 3 kinds of CH3CO2Na aq. solns., whose concns. were 58.0, 60.3, and 62.8 wt.% and which contained a small amt. of crystal nucleation catalyst Na4P2O7.10H2O. In 60.3 wt.% aq. soln. (CH3CO2Na.3H2O), the nucleation catalyst began to get deactivated by preheating a ~81°, higher by 23° than the m.p. of CH3CO2Na.3H2O. The temp. at which the catalyst began to get deactivated was raised with increasing CH3CO2Na concn. of the soln.; thus, in 62.8 wt.% CH3CO2Na aq. soln., the catalyst began to get deactivated at 85°. One hundred samples, each consisting of 8 g of 60.3 wt.% CH3CO2Na aq. soln. and 0.16 g of Na4P2O7.10H2O, all crystd. on cooling to 40°, even after they had been preheated at 80° for 39 h. These results are explained on the basis of the cryst. adsorption model proposed by W. T. Richards (1932). .