Strontium sulfate, temperature

Finely powder 50 g. of celestite (or commercial strontium sulfate) and mix it with 20 g. of powdered charcoal. Pack the mixture into an earthenware crucible of as thin walls as possible and heat at the highest temperature of the furnace for about 2 hr. Allow the crucible to cool and test a small portion with dilute hydrochloric or nitric acid. If the residue is chiefly carbon, the reduction is successful if a large amount of insoluble... 

Figs 9.9 and 9.10 can be used to obtain K, Pca and PaDc for the stability index. Similar indices may be used to predict bariiun sulfate or strontium sulfate or calcium sulfate deposition. If the product of concentration of Ca ions and SO4 ions exceeds the solubility products ( p) of CaS04, calcium sulfate would be precipitated. The solubility of calcium sulfate decreases with an increase in the temperature. CaCOj and CaS04 scaling cause major problems in plants and equipment encountering salt water. 

The value of Tk increases as the amphiphile hydrophobic chain length increases. The Krafft points of the sodium salts of the classic amphiphiles (alkyl sulfates, sulfonates, and benzenesulfonates) are usually below room temperature. The Krafft point is a function of the counter-ion. Alkaline earth cations give higher Krafft points for sodium laurylsulfate, 7 k = 9°C the values for the calcium, strontium, and barium salts are 50, 64, and 105°C, respectively. 

Strontium compounds are readily absorbed following inhalation or oral exposure and are rapidly distributed throughout the body (see Section 3.4). Because of its similarity to calcium, strontium entering the circulation preferentially accumulates in bone. Methods for reducing the body burden of radiostrontium that have been tested in animals include calcium, chelators (with variable results), hemodialysis, and magnesium sulfate. Exposure to cold temperatures, use of the few pharmacological agents that have been tested, and use of stable strontium are less satisfactory treatments. 

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