scholarly journals Spectrophotometric Determination of Europium, Terbium and Yttrium in a Perchloric Acid Solution by the Kalman Filter Approach.

1999 ◽  
Vol 15 (11) ◽  
pp. 1123-1127 ◽  
Author(s):  
Yongnian NI ◽  
Yingliang WU
Keyword(s):  
Kalman Filter ◽  
Acid Solution ◽  
Spectrophotometric Determination ◽  
Perchloric Acid ◽  
Perchloric Acid Solution ◽  
Filter Approach

A Simplified Technique for Determination of Small Amounts of Calcium as Oxalate

1964 ◽  
Vol 10 (4) ◽  
pp. 352-365
Author(s):  
Donald D Van Slyke ◽  
Paul E Carson
Keyword(s):  
Acid Solution ◽  
Calcium Oxalate ◽  
Perchloric Acid ◽  
Perchloric Acid Solution ◽  
Ceric Sulfate ◽  
Glass Filter ◽  
Oxalate Precipitation ◽  
Oxalate Solution ◽  
Filter Tube

Abstract Procedures for determination of calcium by oxalate precipitation are reviewed, and a method is described in which the calcium oxalate precipitate is both formed and washed in a filter tube with a fritted-glass filter. Washing with saturated calcium oxalate solution is completed in 1-2 min. The washed precipitate is redissolved in perchloric acid solution and the dissolved oxalate is either titrated or determined manometrically by the CO2 evolved from oxidation with ceric sulfate.

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