Cerous sulfate

Miscellaneous Compounds. Among simple ionic salts cerium(III) acetate [17829-82-2] as commercially prepared, has lV2 H2O, has a moderate (- 100 g/L) aqueous solubiUty that decreases with increased temperature, and is an attractive precursor to the oxide. Cerous sulfate [13454-94-9] can be made in a wide range of hydrated forms and has solubiUty behavior comparable to that of the acetate. Many double sulfates having alkaU metal and/or ammonium cations, and varying degrees of aqueous solubiUty are known. Cerium(III) phosphate [13454-71 -2] being equivalent to mona2ite, is very stable. 

NH4)2S04 forms many double salts (ammonium metal sulfates) when its solution is mixed with equimolar solutions of metal sulfates and the solution is slowly evaporated. Such double metal sulfates include ammonium cobal-tous sulfate, (NH4)2Co(S04)2 ferric ammonium sulfate, (NH4)2Fe(S04)2, ammonium nickel sulfate, (NH4)2Ni(S04)2 and ammonium cerous sulfate, NH4CeS04. 

Further purification of HP-j8-CDs can be carried out through the thin layer chromatography. A formula for developing was propanol, ethyl acetate, aqua ammonia and water were prepared by 6 1 1 3, or acetonitrile, water, aqua ammonia was mixed by 6 3 1, the latter formula has a shorter developing time. The color development reagents are cerous sulfate 1 g, ammonium molybdate 24 g, concentrated sulfuric acid 50 mb, 450 mL deionized water. Because of the adsorption principle of the silica gel, the more the substituent on the HP- -CDs, the faster the molecules will move. Therefore, the high DS HP-)3-CDs move a long distance. Furthermore, HP-j8-CDs can be purified by sihca column. The mobile phase was chloroform/methanol (100 1) [26]. 

Ceric Sulfate (or Ceric-Cerous Sulfate) Dosimeter... 

Ceric-cerous sulfate UV spectrophotometry, potentiometry 10 -10 3% ISO/ASTM 51205... 

The ceric-cerous sulfate dosimeter is a chemical dosimeter acting either as a routine dosimeter or as a reference standard dosimeter for the measurement of high dose levels (Matthews, 1982). A routine dosimeter is used in radiation processing facilities for dose mapping. A reference standard dosimeter is used to calibrate radiation fields and routine dosimeters. The dosimeter is based on the reduction of cerium(IV) to cerium(in) in an aqueous solution by radiation (Matthews, 1971). Doses in the range 0.5 to 50 kGy can be determined by conventional spectrophotometric analysis in the ultraviolet region, or by measuring the difference in the electrochemical potential between the irradiated and non-irradiated solutions in an electrochemical potentiometer (Matthews, 1972 Church et al., 1976). As most dosimeters, the... 

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